Physical mocks Flashcards

Question 1

Q

what is water stress?

Answer

A

if a country’s renewable freshwater supply is between 1000 and 1700mcubed per person per year

Question 2

Q

what is water insecurity?

Answer

A

when present and future water supplies cannot be guaranteed

Question 3

Q

what is (physical) water scarcity?

Answer

A

if a country’s renewable freshwater supply falls to below 1000mcubed per person per year

Question 4

Q

which areas are experiencing water scarcity?

Answer

A

areas along the sub-tropical ridge are seeing water scarcity
saudi arabia, algeria and syria are experiencing absolute scarcity (less than 500 mcubed/person/day)
2025 predictions show that Southern Hemisphere will see a lot of economic water scarcity whilst the north will increase most no or little water scarcity or physical water scarcity

Question 5

Q

which areas are experiencing water stress?

Answer

A

much of east africa and India are experiencing water stress

Question 6

Q

explain the growing mismatch between water supply and demand

Answer

A

relates to the distribution of freshwater resources (water availability) and the distribution of the demand for water
12% of the world’s population consumes 85% of its water
rapid population growth in areas where supplies are limited together with an uneven distribution of global supply and a deterioration in water quality means more people are facing water shortages

Question 7

Q

what are the 4 physical causes of water insecurity?

Answer

A

salt water encroachment at the coast
climate change is changing hydrological cycle
ENSO cycles
blocking sub-tropical ridge

Question 8

Q

explain salt water encroachment and the Florida case study

Answer

A

physical process caused by humans directly and indirectly
more water is being abstracted from aquifers near the ocean, as more is abstracted the salt water seeps into the ground and into the aquifer, slowly contaminating the freshwater supply
e.g. FLORIDA where water demand is increasing due to increasing affluence meaning more swimming pools and more water is being abstracted from aquifers near the ocean

Question 9

Q

what are the 2 human causes of water insecurity?

Answer

A

overabstraction from rivers, lakes and groundwater aquifers
water contamination from agriculture, industrial and domestic pollution

Question 10

Q

explain two examples of chains of reasoning for water stress and insecurity

1) increasing pop and economic growth
2) low development levels

Answer

A

increasing pop and economic growth - increased demand for water - overabstraction of groundwater and surface stores - salt water intrusion at the coast - water stress and scarcity

low development levels - lack of investment into making freshwater available and affordable, damage to ecosystems, decline in water availability, water stress and security

Question 11

Q

what are the 4 main factors for the rising demand of water (explained)

Answer

A

1) population growth
- demand for water is growing twice as fast as pop growth
- increased urbanisation puts a threat on the availability of freshwater with more than half of the world living in urban areas
- by 2030, the urban pop in Asia and africa is set to double

2) rising living standards
- increase in middle class led to sharp increase in water use, swimming pools, washing machines and dishwashers
- changing consumption patterns such as increasing meat consumption and building bigger homes

3) economic development (agriculture and industrialisation)
- the OECD predict that global water demand for manufacturing would increase by 400% from 2000-2050
- where water is not well regulated, pollution could increase dramatically with industrial spillage and poor waste management
AGRICULTURE
- in some cases up to 90% of water used by a country is for agriculture, growing demand for food
- agricultural demands for freshwater are unsustainable through increasing pesticide and fertiliser pollution, depleting aquifers and increased salinity
- 20% of the world’s irrigated land now suffers from salinity

Question 12

Q

what are the three main pressures increasing the risk of water insecurity?

Answer

A

1) diminishing supply
- climate change and impacts
- deteriorating quality from pollution
- impact of competing users (upstream vs downstream)

2) rising demands
- pop growth
- economic development

3) competing demands from users (within basins)
- international issues
- upstream vs downstream
- HEP vs irrigation

Question 13

Q

explain the causes and patterns of physical scarcity

Answer

A

this occurs when more than 75% of a country’s or region’s blue water (accessible liquid) flows are being used
currently applies to 25% of the population
qualifying countries include the Middle East and North Africa

Question 14

Q

explain the causes and patterns of economic scarcity

Answer

A

occurs when the use of blue water sources is limited by lack of capital, technology and good governance
estimated that 1 billion people are restricted from accessing blue water due to poverty
this is seen in most areas of africa and parts of continental south east Asia

Question 15

Q

why does the price of water vary globally

Answer

A

whether governments own or private companies own water supplies, in Bolivia water was privatised where an American TNC took control and this led to outrage, prices soared, mass conflict
the initial costs involved, cost of infrastructure pipes means many rely on trees vendors (can be up to 100 times the cost than if the water were to be supplied to their home), charities such as WaterAid need to offer invaluable help, their programmes help to reduce the extent of economic water security
governments can choose to tax water supplies or subsidise, in Denmark it is most expensive as government are trying to reduce consumption, canada subsidies for consumers, canada it is heavily subsidised by the gov and so water is 80% cheaper than in Germany where it is private.
supply and demand
colonial governments would install limited infrastructure and the IMF restricts gov spending on water and so now water provision is often controlled by the private sector

Question 16

Q

explain the water poverty index

Answer

A

the WPI uses five measures to indicate levels of water insecurity:

1) resources- the physical availability of surface and groundwater and its quality
2) access- the accessibility of safe water for human use, including domestic, industrial and agricultural use
3) capacity- the effectiveness of water management to ensure affordability
4) use- the use of water for different purposes, including domestic, industrial and agricultural use
5) environment- water management strategies to ensure ecological sustainability

each of the measures are scored out of 20 to give an overall score of up to 100

Question 17

Q

explain the water poverty index for the UK, china and the USA

Answer

A

UK- they have a very good WPI at 71, they score the best in terms of capacity at 17.8 meaning they are very efficient in terms of the water they use

China- they have a medium WPI at 56.6 with their use scoring the highest at 18, this could be down to their growing pop and middle class, they score the best in terms of resources at 7.1

USA- they have a a medium WPI at 58.5, their use is at 1.3 as they waste a lot of water, they are not efficient

Question 18

Q

explain the importance of water supply for human well-being (two chains of reasoning)

Answer

A

improvements in water, reduction in illnesses from dirty water (65% reduction in deaths from diarrhoea), improved health, access to working life and therefore reduced poverty

improvements in water, lower medical costs and fewer days off work, improved school attendance, improved education and career opportunities, reduced poverty

water, particularly that polluted by lack of sanitation, is an effective medium for the breeding and transmission of diseases such as typhoid and cholera
safe water is vital to human health particularly in the context of washing and food preparation, also productive breeding ground for disease vector such as parasitic worms and mosquitoes
millennium development goals aimed to halve the number of people without access to safe drinking water and sanitation by 2015
the WHO says ‘every dollar spent on improving sanitation generates an average economic benefit of US$7
this shows that water is very important for economic development, quality of life and escaping the cycle of poverty

Question 19

Q

explain the importance of water supply for economic development (industry, energy supply, agriculture)

Answer

A

agriculture

agriculture dominates water use, more than twice the total withdrawn for industrial and domestic purposes
in some countries 90% of water used in a country is for agriculture
20% of the world’s irrigated and of this most is pumped directly from aquifers and is leading to massive groundwater depletion , water situation is unsustainable

industry and energy

just over 20% of all freshwater withdrawals are for industrial and energy production
mounting concern of the growth of biofuels as the crops are very thirsty
water pollution is a major problems associated with much of this industrial use of water

Question 20

Q

explain Madagascar’s dirty water

Answer

A

contaminated drinking water has led to the country having one of the highest rates of stunting in the world
stunted children don’t grow properly, physically and cognitively, this can therefore affect school and employment and therefore poverty
160 million children under 5 are stunted, half of children in Madagascar are stunted
WaterAid having to intervene in order to guarantee sustainability and preventing stunting and malnutrition

Question 21

Q

what has the privatisation of water systems resulted in for developing nations?

Answer

A

in the 1980s the world bank and IMF gave loans to developing countries to privatise their water system to reduce costs but many have cancelled these projects as the water becomes unaffordable for a lot of people

Question 22

Q

explain what is happening in Bolivia to water

Answer

A

50% average increase in water rates for SEMAPA customers (water company) led to many residents becoming opposed to privatisation
the smaller providers are given poorly constructed and deteriorating systems which have an estimated 35% of their water being lost to leaks
those outside the grid are forced to pay 5 to 10 times more than SEMAPA consumers

Question 23

Q

explain what is happening in Canada to water

Answer

A

current water charges are about 1/4 of european rates and 3/4 of American rates
the rates in OECD nations are often not high enough to cover basic utility operations and maintenance costs
almost 40% of Montreal’s water is lost each year due to leaky infrastructure cost estimated to repair at $4 billion

Question 24

Q

explain what is happening in denmark to water

Answer

A

the highest prices for fresh water in the world as they believe that by setting high pries it will help the environment as they will appreciate its scarcity and true value, this leads to greater water conservation, water consumption has dropped dramatically however they have seen an economic strain as a result.

Question 25

Q

explain the importance of water supply for economic sustainability

Answer

A

water is essential in the production of most goods and services including food and energy, needed to ensure economic sustainability
industrial water supply must be reliable and predictable to support financially sustainable investment in economic activities, 400% water demand increase for manufacturing between 2000 and 2050
agriculture or family run businesses depend on water for generating an income, water is important for reducing poverty through better health, increased poverty and time savings
most growth in water demand is being seen in BRIC nations
by 2050 food production will require 140% more water

Question 26

Q

explain the importance of water for environmental sustainability

Answer

A

wetlands reduce floods, store water and provide economic benefits through fisheries and recreation, half are lost
forested highlands essential for recharging aquifers and ensuring clean flows for agriculture and HEP, deforestation and urbanisation
degraded ecosystems lose resilience leading to water quality degradation, e.g. Salton Sea in California, productive ecosystem which provides a food source for over 400 birds, since 2005 water levels have been dropping as evaporation exceeds inflow, salinity levels increasing
due to high demand water goes to agriculture and some inflow consists contaminated runoff from fields

Question 27

Q

what are technological and attitudinal fixes?

Answer

A

technological fixes- either involve large scale hard engineering projects (top down) or small scale innovations and appropriate technology (bottom up)

attitudinal fixes- involves people changing their behaviour towards water use to conserve water

Question 28

Q

what are the 3 examples of hard engineering techno fix mega projects?

Answer

A

the 3 gorges dam, china
the south-north water transfer project, china
Israel’s desalination project

Question 29

Q

explain the 3 gorges dam china and the positives and negatives

Answer

A

built on the Yangtze River which flows west to east through south china
concrete and steel dam 2.3km long, made of 510k tonnes of steel
enables surplus water to build up and be diverted to northern china via the south-north transfer project

positives:

the power generated by the 34 generators is equivalent to burning 25 million tons of crude oil or 50 million tons of coal
designed to control flooding on the Yangtze, improve water supply by regulating river flow, generate HEP for china’s economic growth

negatives:

very expensive, $35 billion
632m squared of land flooded to form reservoir, displacing 1.3 million people from 1500 villages
water quality affected by waste from industry, sewage and farms
decomposing vegetation in the reservoir produces methane which is a strong greenhouse gas

Question 30

Q

explain the south-north water transfer project, china

Answer

A

to provide water for Beijing region which has 35% of the population, 40% of the arable land but only 7% of water
3 routes will transfer 25 billion m cubed of water from the Yangtze River to northern china: western route to the yellow river, an eastern route via a series of lakes and a central route
the cost is US$70 billion, due for completion by 2050
Beijing has similar water scarcity to Saudi Arabia, just 100m cubed per person
positives:
will boost economic development in Beijing
will reduce abstraction of groundwater (water tables dropped by 300m since the 70s)
negatives:
345,000 people displaced as submerges 370km squared of land
risks draining too much water from southern china which has also experienced water scarcity, creating conflict within china
eastern route runs through heavy industry so is likely to become more polluted
water supply might be too expensive for farmers to buy so they will continue to extracts groundwater

Question 31

Q

explain Israel’s desalination project and its pros and cons

Answer

A

abstraction of sea water from the Mediterranean
water is either evaporated to leave behind the salts that make seawater unusable or undergoes reverse osmosis where water is pushed through a membrane to separate it from the salts
produces up to 600 tonnes of potable water per hour

positives:
- can provide a reliable supply for large settlements
- 5 plants opened in 2013 aiming to provide 70% of Israel’s domestic water supplies by 2030
- some plants are using solar power to run

negatives:

each plant requires its own power station in order to boil the water, contributing to co2 emissions
produces vast amounts of brine that needs to be released back into the sea or disposed of which can potentially harm ecosystems

Question 32

Q

explain briefly Sydney’s desalination project

Answer

A

running at full capacity yet it supplies just 15% of sydney’s water needs
only has minimal impacts on the environment
globally there are 15,900 operational desalination plants producing about a million cubic metres of desalinated water

Question 33

Q

what are the 4 sections of the sustainability quadrant (briefly explained)

Answer

A

EQUITY

does it negatively affect those downstream?
fair accessibility and affordability for all
not affecting everyones well-being

FUTURITY

conservation of water supplies so they dont run out
provides long term security
economically viable practises

PUBLIC PARTICIPIATION

involves communities in decision making and implementation
appropriate technologies used so public can access

ENVIRONMENT

protection of wetland ecosystems
restoration of lost and damaged ecosystems
carbon neutral, not polluting
tipping points

Question 34

Q

what are the main aims of sustainable water management? give statistic of no. of irrigated fields in California and statistic on pipe leakage in Cairo and Israel

Answer

A

minimise waste and pollution of water resources
ensure that there is access to safe water for all people at an affordable price
take into account the views of all water users
guarantee an equity;e distribution of water within and between countries
38% of irrigated fields in California use drip
pipe leakage in cairo is 50%
pipe leakage in Israel is 9-10%

Question 35

Q

what are 5 sustainable water management strategies

Answer

A

1) smart irrigation- slow supply of constant water, no waste, gives the minimum amount of water necessary for high yield, it is highly monitored
2) virtual water- importing crops that have used water, instead of using large amounts of water to irrigate, you only use water for other uses, seen in very arid regions
3) rainwater harvesitng- where people collect the rain falling on the roof s of dwellings and store it in butts for various domestic purposes, such as flushing toilets and watering the garden
4) recycling water- recycling sewage water and purifying it to be able to drink
5) attitudinal fix, charges increase to reflect actual costs- controlling the price of water to make people waste less

Question 36

Q

explain what is happening in Uganda in terms of sustainable water management

Answer

A

local builders trained in the construction of rainwater harvesting jars which are made from locally available materials and have a capacity of 1500 litres
they collect rainfall from roofs and store water for dryer periods
once constructed, the jars can provide a stable water source for many years
organised by WaterAid that raises funds to improve access to safe water, sanitation and hygiene for the world’s poorest people
In Kitayita village, Uganda where 3000 people lack access to safe water

Question 37

Q

explain what is happening in Singapore to sustainable water management

Answer

A

they have the cutting edge of new technologies to re-use grey water, NEWater is recycled water that is treated using disinfectant, meets 30% of the current needs
leakages have been cut by 5%
Singapore still need to import water, they have an agreement until 2061 to important water from Malaysia
desalination of seawater, two plants now meet 25% of the water demand
they have also invested into agro technology in order to diversify their water supply (water harvesting)

Question 38

Q

explain what is happening in Israel for sustainable water management

Answer

A

due to their climate, natural geography and politics it has formed them to manage their water efficiently
aim to transfer water from the sea of galilee to the centre of the country
they have done this through:
smart irrigation, water drips slowly into roots, saves 25-75% pumped water compared to food , organised by Netafim
reducing agricultural consumption, importing water in food as visual water
adopting stringent conservation techniques
pricing water to discourage waste
Netafim says their crops yield 15% more due to the few amounts of fertilisers needed and therefore lower chemical pollution, drip tech releases fewer GGs than irrigation
they acquire new supplies through:
importing 50 million tonnes fo water per year by ship from turkey (Manavgat Project)
piping seawater from the Red Sea and mediterranean to new inland desalination plants

Question 39

Q

explain the restoring aquifers in Saudi arabia

Answer

A

circular irrigation systems to grow enough wheat to feed itself and neighbours using water from its aquifers, levels fell in aquifers
wheat farms have been abandoned to reduce demands upon aquifers supplying irrigation waters

Question 40

Q

how is Colorado’s IDBM successful?

Answer

A

in 2012, the minute 139 plan helped to revive the delta and restore some normality
beginning to improve as people make changes, e.g. people in Las Vegas use turf instead of grass

Question 41

Q

how is Colorado’s IDBM not successful?

Answer

A

the rate of climate change is far greater than the IDBM’s ability to mitigate change
irrigation still needs to be reduced and water recycling/smart irrigation should be implemented
attitudes must change as Americans believe they have a right to water and don’t believe the views of climate change scientists should change their lifestyles

Question 42

Q

what is absolute water scarcity?

Answer

A

when renewable water supplies (from rivers, aquifers and lakes) become very low (less than 500mcubed per person per year). this leads to widespread restrictions.

Question 43

Q

what is economic water security?

Answer

A

when clean water is unaffordable even when its available

Question 44

Q

what is renewable water?

Answer

A

the total amount of a country’s water resources (internal and external), both surface water and groundwater, which is generated through the hydrological cycle (precipitation)

Question 45

Q

what is desalinisation?

Answer

A

it is the process by which dissolved solids in sea water are partially or completely removed to make it suitable for human use. recently there have been many technological advancements in the process of reverse osmosis in order to desalinise sea water

Question 46

Q

what is a drainage basin?

Answer

A

it is an area of land drained by a river and its tributaries

Question 47

Q

what is the jet stream?

Answer

A

it is a current of rapidly moving air that is usually several thousand miles long and wide but is relatively thin

Question 48

Q

what is smart irrigation?

Answer

A

the process of applying controlled amounts of water to plants at needed intervals, it is a highly monitored way of ensuring no waste

Question 49

Q

what does permeability mean?

Answer

A

a measure of the ability of soil, sediments and rock to transport water horizontally and vertically

Question 50

Q

what does pervious mean?

Answer

A

a surface that allows the percolation of water including the underlying soil

Question 51

Q

what does porous mean?

Answer

A

a surface that allows water to pass through it, such as sand

Question 52

Q

what is the sub tropical ridge?

Answer

A

it is a large belt of high pressure around 30º north and south and is made up of mainly calm winds, creates trade winds and the westerlies, area of descending air

Question 53

Q

what is groundwater?

Answer

A

also known as aquifers, it is water held underground in the soil or in pores and crevices in rock

Question 54

Q

what is beach morphology?

Answer

A

the shape of a beach including width and slope (profile) and other features such as berms

Question 55

Q

what are cliff profiles influenced by?

Answer

A

geology, especially the resistance to erosion of the rock

- the dip of rock strata in relation to the coastline

Question 56

Q

explain joints

Answer

A

(vertical cracks), these are fractures caused either by contraction as sediments dry out or by earth movements during uplift - they are fractures created without displacement and occur in most rocks, dividing rock strata up into blocks with a regular shape - jointing increases erosion rates by creating fissures which marine erosion processes such as HA can exploit example: in bantry bay, the limestone is heavily pointed, leading to more rapid fluvial and marine processes in adjacent sandstones

Question 57

Q

explain faults

Answer

A

formed when he stress of pressure not which a rock is subjected, exceeds its internal strength (causing it to fracture). the faults then slip along fault planes. - it significantly increases erosion since faulted rocks are much more easily jointed - huge forces are involved in faulting and displacing them and therefore either side of the fault line, rocks are often heavily fractured example: in bantry bay in cork in the republic of Ireland there is a major fault which runs SW-NE down the centre of the bays. the limestone is weakened allowing rapid fluvial erosion

Question 58

Q

explain folds

Answer

A

they are bends in rocks formed by pressure during tectonic activity which makes rocks buckle and crumple - the main two types are anticlines and synclines - folden rock is often more heavily fissured and jolted, meaning they are more easily eroded, also increases erosion by increasing angle of dip and causing joins through the stretching along anticline crests an compressed in syncline troughs

Question 59

Q

explain dips

Answer

A

refers to the angle at which rock strata lie (horizontally, vertically, dipping towards the sea or dipping inland) - its a tectonic feature, sedimentary rocks deposited horizontally can be tilted by faulting and folding by tectonic forces

Question 60

Q

what is horizontal dipping?

Answer

A

a vertical or near-vertical profile, notches reflect weathering and small scale mass movement

Question 61

Q

what is a high angle of seaward dip

Answer

A

produces a sloping, low-angled profile with vulnerable rock layers, loosened by weathering

Question 62

Q

what is a low angle of seaward dip

Answer

A

produces a steep profile that may even exceed 90 degrees, creating areas of overhanging rock, vulnerable to rock falls

Question 63

Q

what is landward dipping strata

Answer

A

produces a steep profile that may even exceed 90 degrees, creating areas of overhanging rock, vulnerable to rock falls

Question 64

Q

what is a cliff profile?

Answer

A

the height and angle of a cliff face, plus its features such as wave cut notches or changes in slope areas

Answer 65

A

small-scale features such a scales and wave-cut notches which form part of a cliff profile - the location of these micro-features are often controlled by the location of faults and/or strata which have a high amount of joints and fissures

Answer 66

A

the relief or height and slope of land is also affected by geology and geological structure. there is a direct relationship between rock type, lithology and cliff profiles

Answer 67

A

1) horizontal starat produce steep cliffs with clear bedding planes
2) rocks dip gently towards the sea with almost vertical joints, joints are opened by weathering and pressure release
3) steep drip towards the sea and rock slabs slide down the cliff along bedding planes
4) rocks dip inland producing a stable, steep cliff profile

Answer 68

A

refers to the physical characteristics of the rock. igenous, metamorphic, sedimentary and unconsolidated rock each have different characteristics.

it also influences geological structure on ameso (medium scale) and micro scale (some types of rocks are more likely to have joints and bedding planes)

Answer 69

A

1) mineral composition
2) rock type
3) structure

Answer 70

A

some rocks contain reactive minerals eaisly broken by chemical weathering, e.g. calcite in limestone
other minerals are more inert that chemically weather more slowly

Answer 71

A

sedimentary rocks are clastic (sediment particles compacted together) and these are often reactive and easily chemically weathered
igneous rocks are crystalline with strong chemcial bonding
rocky coasltines differ in resistance

Answer 72

A

rocks with fissures or air spaces erode more easily

Answer 73

A

it is influenced by bedrock lithology (I,S,M) and the geology

how reactive minerals in the rock are when exposed to chemical weathering
whether rocks are clastic (less) or crystalline (more resistant)
the degree to which rocks have cracks, fractures and fissures

Answer 74

A

most resistant: IGNEOUS- Land’s End, South Cornwall (granite)

resistant rock: METAMORPHIC- St Ives, Cornwall (slate)

resistant sedimentary rock: SEDIMENTARY- Blackers hole, south Purbeck, Dorset (Limestone)

least resistant rock: Holderness, NE Coast, (boulder clay)

Answer 75

A

their crystalline structure (interlocking cystals) means they are well connected and impermeable with few lines of weaknesses (resistant)
these rock types create rocky coastlineswith steep profile cliffs
erosion rates: 0.1-.0.3 cm/yr
e.g. granite, basalt
example: lands end, Cornwall (granite)

Answer 76

A

they are also well-connected and impermeable
however they are often folded and faulted so have weaknesses
these rock types create rocky coasltines with steep profile cliffs (depending on folding and dip) and erode slowly
erosion rates: 0.5-1 cm/yr
e.g. marble, slate, schist
crystalline rocks are resistant to erosion
example: St Ives, Cornwall (slate)

Answer 77

A

they are clastic meaning they are made up of cemented sediment particles rather than interlocking crystals
formed in stratas (layers) with joints which provides weaknesses and makes limestone permeable along with other jointed sediemntary rocks whereas other ones are porous due to the presence of air spaces
rocks that are younger erode faster than the others as they are softer and weaker, older sediment is buried deeper and is subject to more intense compaction with strongersedimentation- making them more resistant
limestone erosion rates: 1-2cm/yr, chalk erosion rate: 1-100 cm/yr
example: Old Harry, Purbeck, Dorset (chalk)

Answer 78

A

they are the least resistant, they are not cemented together in anyway so are very vulnerable to erosion, fast recession rates
can create slumped coastlines due to mudslides/landslides causing slumping
the boulder clay of Holderness coast in Yorkshire retreats at a rate of 2-10 m p.a
boulder clay erosion rates: 100-1000 cm/yr, sandstone rate: 10-100 cm/yr

Answer 79

A

geology
lithology
weathering
mass movement

Answer 80

A

where cliffs are composed of differing lithology, leads to different sections of a cliff eroding/receding at different rates. it can also be produced when there are alternating permeable and non-permeable strata

they may form a ‘bench’ feature at the cliff base and further up overhanging sections until they collapse by mass movement.

however, the overall rate of recession is determined by the resistance of the weakest rock layer

Answer 81

A

a spring creating erosion and saturation leads to slumping
poor water pressure leads to slumping
wave-cut notches from different rates of erosion
resistant rock creating a bench feature at the cliff base

Answer 82

A

when groundwater flows through the permeable sands but cannot flow through the impermeable clay which leads to the permeable layer becoming saturated, weakening it and causing slumping

Answer 83

A

poor water pressure (the internal force within cliffs exerted by groundwater) in the saturated layers pushes rock particles apart, reduces friction and lubricates lines of weaknesses

Answer 84

A

wave cut notches are created by erosion of the weak coal layer with more resistant siltstone overhanging the coal below

Answer 85

A

permeable rocks allow water to pass throug them. groundwater flow through permeable rock can weaken the rock by removing the cement that binds the rock sediment. slumping is a common outcome.

Answer 86

A

1) steep, unvegetated cliffs

2) shallow-angled, vegetated cliffs

Answer 87

A

produced where marine erosion dominates

- there is little or no debris at the base as it is broken by attrition and transported offshore or along the coast

Answer 88

A

they have a convex profile (curved like the interor of a circle)
there is debris at the base becuase sub-aerial processes slowly move sediment downslope, but marine erosion is unable to rmeove it from base
produced where there is little active marine erosion

Answer 89

A

refers to how the rock is arranged on a macro-scale and looks at the arrangement of different rock types in relation to each other.It looks at the rock strata, deformation and presence of faulting.It looks at the rock strata, deformation and presence of faulting.

Answer 90

A

waves are created through friction between the wind and water surface, transferring energy from the wind into the water. this generates ripples, which grows into waves whedn the wind is sustained.

Answer 91

A

the strength of the wind
how long has the wind been blowing for
the length of the fetch

Answer 92

A

this is the uninterrupted distance across water over which the wind blows and therefore the distance waves have to grow in size

Answer 93

A

the southwest due to the long fetch along the atlantic

Answer 94

A

1) waves move across open ocean in circular motion as ocean swell
2) as the waves reach shallower water, when their wave height is less than half the wavelength then friction increases slowing the wave down for the circular oscillations to become more so elliptical
3) as the wavelength decreases due to the shallower water, wave height increases and eventually the wave breaks as the top of the wave is moving faster than the base
4) the waves then lose enrgy and gravity pulls the water back as backwash

Answer 95

A

they degrade a beach
high waveheight, low wavelength
backwash > swash
drags sediment back to sea
scours beach
13-15 break/minute
high energy
causes cliff retreat
plunging breaker
steep beach

Answer 96

A

they aggrede a beach
low waveheight, long wavelength
swash > backwash
brings sediment back to the sea
builds beach up
6-8 break/minute
low energy
spilling breaker
flat beach

Answer 97

A

waves formed by winds blowing over larger distances, they travel out of windy and stormy areas
swell waves originate in mid-ocean and maintain their energy for thousands of miles
is an ocean wave system not raised by the local wind blowing
as swell waves advance, its crest becomes flattened and rounded and its surface smooth

Answer 98

A

recession rate increases if dip is towards so as weathering opens joints and gravity speeds mass movement
steep dip to the sea increases erosion rate as gravity makes bedding planes unstable and slabs slide downslope. this increases recession rates
a cliff with landward dipping bedding planes are relatively steep and stable whcih decreases recession rates
landward dip with well-developed joints will increase recession rates as joints acts as slide planes

Answer 99

A

abrasion- the rubbbing together of hard load, sand paper effect

attrition- rocks bashing into one another breaking them down

hydraulic action- air trapped in cracks and fissures is compressed by the force of the waves crashing against the cliff face. when the wave retreats, pressure is released explosively which can widen cracks and dislodge blocks friom the cliff face

solution- where water in waves dissolves rock minerals

Answer 100

A

most effective during high energy storm events with large destructive waves
most effective in winter, in high energy storms
faster when the tide is high

Answer 101

A

the headland protrudes out into the sea as it is more resistant which means wave energy is concentrated on it due to wave refraction
wave action attacks weaknesses in the headland due to abrasion and hydraulic action leading to cavitation
this widens cracks into crevices and into caves
caves can be eroded to form blowholes as the ceiling collapses
marine erosion deepens the caves until they connect up andan arch is created and erosion continues and the roofof the arch becomes unstable from the widening of the arch due to weathering and other sub-aerial processes
the arch eventually collapses by blockfallto form a stack
continual undercutting and HA in the joints at the base of the stack creating a stump like Old Harry’s wife

Answer 102

A

wave refraction concentrates wave action on the headlnad, hydraulic action and abrasion slowly erodes the headland to form a series of landforms
1) chalk headland leads to wave refraction
2) deposited sand from nearby waters deposit to form beaches
3) waves carved into rock to form chalk cliffs, undercut to form hollow until it becomes so unstable that it collapses
4) pockets of air are compressed into the cracks with the water that it becomes unstable and falls
5) wave quarrying forms arches

Answer 103

A

caves can partially collapse to produce a hole in the cliff
waves hitting the base of the cliff can be forced through and sprout water at the top

Answer 104

A

they vary in their morphology depending on lithology and weathering are actively eroded by wave action or they are affected by sub-aerial processes

Answer 105

A

1) wave action at the base of the cliff between high and low tidemeans that hydraulic action and abrasion undercuts the clif to form a wave cut notch
2) this continues and the cliff above the notch is left unsupported and eventually collapses
3) the cliff retreats leaving a wave cut platform which is the base of the cliff that is left
4) this process maintains a steep cliff profile

Answer 106

A

it is a flat rock surface exposed at low tide, extending out to sea from the base of a cliff

Answer 107

A

a curved indentation of about 1-2m high extending along the base of a cliff. it forms between the high and low tide marks, where destructive waves impact against the cliff.

Answer 108

A

they are steeper in summer, where constructive waves are more common than destructive. wave energy dissipates and deposits over a wide area.
as the berm builds up, the backwash becomes weaker and only has enough energy to move smaller material, so the beach material becomes smaller towards the shoreline

Answer 109

A

destructive waves occur at a hgiher frequency
berms are eroded by plunging waves and high-energy swash
strong backwash transports sediment offshore (offshore bars are made)
destructive, high-energy waves dominate in the winter, lowering angle of beach profile and spreading shingle over the whole beach

Answer 110

A

as constructive waves have a weaker backwash can only transport smaller particles down the beach. this leads to the sorting of material with larger, heavier shingle at the back of the beach and the sand drawn back closer to the sea.the backwash onlyhas enough energy to transport down smaller sediment.they also become more angular at the back of the beach and rounder at the front of the beach.

Answer 111

A

1) sediment supply- if the supply is reduced from rivers, for example, due to the construction of dams on rivers that traps sediment upstream
2) human interference- often a result of coastal management in one place having an effect on processes further along the coast
3) climate change- if global warming made the UK climate on average stprmier, then destructive waves and ‘winter’ beach profiles would become more common

Answer 112

A

storm beaches result from high-energy deposition of very coarse sediment during the most severe storms
berms typically of shingle/graves, result from summer swell wave deposition
the middle area of the ebach is mainly sand, but the sand is coarser where berms/ridges have been deposited than in chsnnels and runnels
offshore ridges formed by destructive wave erosion and subsequent deposition of sand and shingle offshore.

Answer 113

A

traction- where large, heavy load items are rolled along the sea bed

saltation- where lighter sediment bounces along

suspension- where very light sediment is carried within a body of water or air

solution- where seidment is carried dissolved within the water

Answer 114

A

the prevailing winds (in this case SW) mean that the waves approach the coastline at an angle
this means the swash moves sediment up the beach at the same angle but backwash moves sediment straight down the beach under gravity
waves carry large pebbles by rolling them (traction) and small pebbles by bouncing them (saltation) and sand, silt and clay is suspension
as the process continues, sediment is moved east and over time, a drift aligned beach will form.

Answer 115

A

waves approach the coasltine perpendicular to the beach. the swash and backwash move sediments up and down the beach = stable and straight beach

Answer 116

A

waves approach at an angle and sediment is moved along by longshore drift = wide beaches but uneven in sediment

e.g. porlock bay, Somerset

Answer 117

A

rivers
constructive waves (from seabed)
cliffs
LSD

Answer 118

A

deposition due to gravity settling occurs in low energy coastal environments, course dropped first, finer further away
flocculation helps depositon of fine clay particles that are very llight. they clump together in salt water, making them heavier.

Answer 119

A

1) sediment is moved along the coast by a process called LSD
2) when there is a change in the direction of the coastline (river mouth), longshore drift continues
3) the waves lose energy in the slacker water behind the headlandand the largest sediments are deposited here first in the same direction (gravity settling)
4) as deposition continues, a spit is formed. finer material is carried along futher along the spit before being deposited as it is lighter (course dropped first, finer, further away). flocculation helps to settle fine clay
5) the spit grows and may form a hook if the wind direction changes
6) in the slacker water behind the spit, more deposition takes place and a saltmarsh may develop with halophytic plants helping to trap sediment (links to salt marsh succession). new land is eventually created. e.g. spurn head
e. g. hurst castle spit, Hampshire

Answer 120

A

where there are no river currents, it prevents longshore drift depositing in a straight line across and so evenutally the spit joins with land to form a bar, e.g. chesil beach

it is when a beach or spit extends across a bay to connect two headlands

e.g. slapton ley, devon

Answer 121

A

this is an island joined to the mainland. it develops when deposition occurs behind an island due to the low energy environment. eventually, the island becomes connected to the mainland.
occur on drift aligned coastlines, when longshore drift builds a spit out from land until it contacts with an offshore island.
they are linear ridges (bars) of sand and shingle connecting an offshore islandto the coastline of the mainland.
e. g. chesil beach

Answer 122

A

Double spits are where two spits extend out in opposite directions from both sides of the bay, towards the middle.
They form where longshore drift is operating in different directions on opposite sides of the bay
They can also form when rising sea levels drive ridges of material onshore from the offshore zone.
-Or, a barrier beach driven across a bay forms a bar (e.g. Haff coastlines) but a strong exiting river current may breach the bar toform a double spit.

e.g. sandbanks and purbeck, Dorset

Answer 123

A

low-lying triangular shaped headlands, extending out from a dhoreline, formed from deposited sediment
forms when longshore drift current from opposing directions converge at the boundary of two sediment cells
The sediment is deposited out into the sea by both currents creating a triangular shaped area of deposited material.
They can extend from a few metres to several kilometres
e. g. Dungeness, kent

Answer 124

A

a ridge of material emerging just offshore to form a chain of beaches parallel to the coast
these are offshore sand bars thought to have formed when a plentiful supply of sediment was deposited in sand dunes along the eastern seaboard of the USA by waves and winds
as sea level has risen, land behind was flooded to create a lagoon but the sand dunes themselves became elongated islands running parallel to the coast (USA Atlantic coast)
as sea level continues to rise, they migrate inland
they provide protection to the coastline during storms as they absorb wave energy

Answer 125

A

Offshore bars are ridges of sand or shingle running parallel to the coast in an offshore zone.
forms in shallow water offshore where the slope is gentle
following large erosion events during a storm
beach and dunes can be scoured heavily by destructive waves and carried seawards by backwash
They are also called breakpoint bars because the offshore/nearshore boundary is where waves first begin to break.
They can sometimes be exposed by neap tide.
LSD can add to them or change their shape and they can be temporary

Answer 126

A

the decay and disintegration of rock in situ (where they are) by mechanical, biological or chemical agents.

Answer 127

A

the movement of material downslope as the result of gravity. water commonly acts a lubricant in mass movement.

Answer 128

A

erosion also involves the transport of sediment away from the cliffs, the erosion occurs by an external agent

Answer 129

A

lithology and structure of a cliff can determine mass movements it is vulnerable to
weathering processes cancontribute to the loosening of cliff faces so that mass movements are more likely
water from rainfall is often a key cause of mass movements
angle of the slope will also affect vulnerability

Answer 130

A

landslide

slumping

mudflow

rockfall

soil creep

Answer 131

A

rocks that have jointed or having bedding planes parallel to the slope are susceptible to landslides. increased water leads to less friction, leading to sliding

Answer 132

A

common where softer rock overlies harder rock, it causes rotational scars, repeated slumping creates a terraced cliff profile

A rotational scar is a fresh, curved, unweathered and unvegetated rock surface on the cliff face.
The detached slope section, often with vegetation intact on top of the slump, forms a beach or terraced cliff profile.
Slumping is facilitated by the presence of water, which adds weight (increasing the gravitational force) as well as lubricating it, reducing friction.

Answer 133

A

Flows occur when unconsolidated fine grained sediment, e.g. silts and clays, mix with large volumes of water. They’re common in weak rocks such as clay or unconsolidated sands. They become saturated, lose their cohesion, and flow downslope.

difference between a slide and a flow is that in a slide the material remains intact but in a flow the material becomes jumbled up

Answer 134

A

most likely to occur when strong, jointed and steep rock faces/cliffs are exposed to mechanical weathering or marine erosion,happens on slopes over 40 degres
once broken away, it can form scree at the bottom of the cliff

blockfalls- similar to rock falls but here a large block of rock falls away from the cliff as a single piece.

Answer 135

A

the slowest form of mass movement, an almost continuous process, it is a very slow downhill movement of individual soil particles

Answer 136

A

plant roots

rock boring

seaweed acids

Answer 137

A

freeze thaw

salt crystallisation

wetting and drying

Answer 138

A

carbonation

oxidation

Answer 139

A

water gets into the cracks and freezes and expands up to 9%. this exerts pressure on the cracks which loosens and breaks apart rock. most vulnerable are well jointed rocks, only happens when daily temperatures fluctuate around zero degrees.
effects: creates angular rock fragments at the base of the cliffs called scree and a jagged cliff face. also can contribute tolarge rock falls.

Answer 140

A

salt spray or waves hitting cliffs makes them wet with seawater. this evaporates and leaves salt in cracks on the cliff. overtime, salt crystals form and grow, exerting pressure on the crakcs and pores which loosens and breaks apart rocks. most vulnerable are well jointed rocks (limestone) and porous rocks (sandstone). happens most in hotter climates
effects: creates angular rock fragments at the base of cliffs called scree. some rock faces crumble away.

Answer 141

A

rocks rich in clay expand when they get wet and contract when they dry. this repeated process causes them to crack and break apart
effects: cracks form in cliffs so they become vulnerable to slumping.

Answer 142

A

limestone slowly dissolves as it reacts with weak carbonic acid
This attacks calcium carbonate in limestones, other carbonate rocks and sedimentary rocks with calcite sediment.
effects: joints and cracks get wider on cliffs and wave cut platforms. this makes them more vulnerable to other weathering and mass movement processes

Answer 143

A

oxygen combines with iron based minerals in a rock causing a chemical breakdown of the minerals shown by red rusty colour on the rock face. it produces iron oxides and increases in volume, leading to mechanical breakdown.sandstones and shales often contain iron so are vulnerable.
effects: leads to crumbling of the cliff as sections are no longer bonded together

Answer 144

A

tree and plant roots growing into cracks can slowly widen them and causethem to break apart. important process on vegetated cliff faces.
seeds falling into cracks in rocks can germinate, nourished by rainwater and nutrients from wind-blown sediment.as the plant grows its roots expand and thicken,tree roots exert sufficient tensional force to widen the crack
effects: eventually angular fragments of rock break away as cobble or boulder-sized sediment, rock falls

Answer 145

A

clams and molluscs bore (dig) into rock to make their homes. they can also secrete acids that dissolves rocks. sedimentary rocks in the intertidal zone are vulnerable.

piddocks drill depressions into sock rocks by rotating their shell equipped with sharp edges
effects: holes and weaknesses created are vulnerable to erosion and further weathering

Answer 146

A

some seaweed species like kelp contain pockets of sulphuic acid that can burst on rocks and dissolve them
when the cells break sulphuric acid attacks rock minerals like calcium carbonate leading to a chemical reaction similar to carbonation
effects: leads to crumbling of the cliff as sections are no longer bonded together

Answer 147

A

The angular blockfall debris accumulates at the cliff foot to form atalus scree slope, a fan shaped mound of material.

formed from a blockfall

Answer 148

A

Geological structure largely influences cliff profiles in terms of the landforms that form as a result. If it is a discordant coastline then they are to see headlands and bays but if it is a concordant coastline they will see haffs and coves. Geological structure closely relates to the resistance of the rock and so it determines the rate of coastal recession in the different areas also.

Answer 149

A

they are produced by eustatic sea level rise. they produce fjords, rias, dalmatian coasts and barrier islands

an example is the sognadjord, norway

Answer 150

A

they are produced mainly by isostatic readjustment (rebound)

they produce relcit/fossil cliffs and raised beaches

example: Vik, South Iceland

Answer 151

A

submerged river valleys
the lowest part of the rivers course and its floodplain may be completely drowned, but the higher land becomes exposed
in plan view they tend to be winding, reflecting the original route of the river and valley
before the end of the last ice age, a small river with its tributaries met the sea, creating an estuary at the mouth that is larger than the original river valley
e.g. kingsbridge estuary, devon

Answer 152

A

submerged glacial valleys
they have steep, cleiff-like valleu sides and the water is uniformly deep
these were formed when glaciers eroded below sea-level. when the ice melted the valleys were flodoed to form the fjords
in plan view, fjords tend to have much straigther routes than rias due to the erosive power of the glacier
they often have a submerged lip at the seaward end where the glacier ended and left a terminal moraine.
example: milford sound fjord, new zealand

Answer 153

A

areas of former wave-cut platforms and their beaches which are left at a higher level than the present coastline
a flat surface covered by sand or rounded pebbles/boulders
usually vegeatted by palnt succession

Answer 154

A

a steep slope found at the back of a raised beach exhibiting evdience of formation through amrine erosion but now above hgih tide level
they may contain wave-cut notches, caves and arches providing evidence of formation by marine erosion
episodic nature of isostatic recovery allows marine processes to erode cliffs and deposit beaches when sea levels are stable. relatively rapid drop in sea level then elaves relict coastline abandoned above high tide and some distance inland

Answer 155

A

These are small-scale features such as wave-cut notches, caves, stacks or blow holes. They are normally formed through the presence of faults and strata which have a high amount of joints and fissures.

Answer 156

A

This leads to a series of different landforms forming along the coastline and differing rates of recession. Higher rates of erosions will lead to the formation of bays whilst areas with more resistant rock will simply see faults and joints. It produces complex cliff profiles through the variety of different rock types. Headlands are likely to coincide with resistant rocks and will be characterised by relatively slow rates of recession.

Answer 157

A

HARD TO QUANTIFY

loss of livelihoods
health and well-being (stress, worry)
relocation (break up community)
property insurance does not cover losses from coastal erosion. so there are high costs of relocation (no compensation) and breaks up community
environmental refugees created
the Environment Agency estimates that 800 properties will be lost by 2035

Answer 158

A

EASY TO QUANTIFY

loss of property, business
damage to infrastructure
loss of farmland
falling property values
fall in amenity value
south devon railway line at Dawlish was destroyed in Feb 2014 by storms (£35 million)
homeowners on the norfolk coastline have properties now worth £1
collapse of Holberk Hall Hotel in Scarborough 1993 after 2 months of heavy rainfall. no compensation

Answer 159

A

DIFFICULT TO QUANTIFY

loss of coastal ecosystems and habitats
loss of farmland?
as sea levels rise, salt water will be pushed higher up estuaries and damage fragile ecosystems

Answer 160

A

social:

250,000 homes will be at risk leading to some relocation, breaking up communities
75 hospitals and health services are within 200m of the coasline

economic:

a 1m SLR will expose more than US$162 billion of industrial, commercial, transport and housing infrastructure to flooding and erosion
a 0.2m SLR would cause US$1.4 billion for SE Queensland
tourism industrycontributes US$30 billion to GDP, employs 8% of workforce
expenditure on beach nourishment increase by US$39 a year
AUS$72 billion of homes at risk

environmental:

groundwater supplies may be affected by salt intrusion
great barrier reef and ecosystems like mangrove forests and salt marshes trapped between rising SL and coastal protection measures
SLR will push salt water further up estuaries, affecting freshwater habitats in Kakadu national park
coral reefs may not be able to grow fast enough to keep up with SLR, those more than 50m deep will die

Answer 161

A

social

in san fernando it is estimated that by 2100, the city will lose 300 buildings , over 283,000 m squared of land and over 123,000 m squared of beach
social amenity losses of schools, churches and beaches
up to 2.3 million people could be affected, 63% in manila

economic

the costs of damage due to SLR expected to be $6.5 billion a year without adaptation costs
high poverty means they are economically vulnerable (90% of wealth held by 15% of pop)
in San Fernando property losses to be $2.5 million and land loss of $2.1 million
loss of fishing jobs, hard to find alternative jobs, estimated welfare lost to the local community of $168,000 a year

environmental

in manila bay the natural ecosystem of mangroves, corals and seagrass have been damaged by pollution, over-exploitation and siltation, which greatly reduces their ability to protect the backshore from SLR
rate of SLR is higher than global average because the pacific ocean currents and trade winds move water towards the islands

Answer 162

A

social:

their population of 400,000 is difficult to relocate to mainland countries, they are trying to relocate the residents
growing amount of environmental refugees having to flee their area due to environmental risks

economic:

as it is a small country, no one has homeowners insurance and so when their homes are destroyed they will have nothing
a new artificial island called Hulhumalé has been built from dredging coral and sediment from the seabed between 1997 and 2002 at a cost of US$32 million
economy based on toursim and fishing and so many jobs are to dissapear

environmental:

a SLR of 50cm by 2100 would mean the maldives losing 77% of its land area
very small changes in sea level translate into major losses of land because of the country’s unusual topography

Answer 163

A

they are people and communities forced to abandon their homes due to natural processes. these processes may be sudden as with landslides or volcanic eruptions, or gradual such as rising sea levels
between 2008 and 2013, the philippines had the 3rd largest number of internally displaced people due to natural hazards with 94% of these displacements in 2013- due to ‘storms’
in 2005, over 1 million people evacuated from New Orleans due to hurricane katrina and went to other places across the USA, 30% did not return and became environmental refugees
the UK does not include fleeing from climate change as being a refugee but most are to be those fleeing from sea level rise

Answer 164

A

in the maldives there is conflict over adaptation to SLR. CUrrently the gov have prioritised protecting the capital city of Malé and its tourismindustrybut is not prioritising smaller communities that rely on traditional industries (farming,fishing)
mangroves for the future is an organisation that promotes sustainable development and is helping the maldives to become more sustainably managed for the future by:
1) educating communities on the importance of maintaining coastal mangrove swamps as a natural defence against coastal erosion and flooding
the Global Environment Facility (GEF) has provided small grants to islanders to help them develop sustainable and organic farming as an alternative food and income source to coral reef fish (threatened by both overfishing and global warming)
the Japanese gov have funded mangrove nurseries on the maldives so that damaged mangrove areas can be replanted

Answer 165

A

a coastal climate resilient infrastructure project (2012) supported by the Asian Development Bank (ADB) aims to ‘climate-proof’ the area

this involves:

improving road connection for farmers and markets whilst raising embankments to 60cm above normal flood levels and making them resilient to CE
creating new market areas with sheds raised on platforms above the expected 2050 sea level
constructing, improving or extending 25 tropical cyclone shelters, taking account of SLR and higher wind speeds
training in climate resilience and adaptation measures
it was loaned US$60 million by the IFAD and project was rated as satisfactory
1.5m rise in sea level would flood 22,000km sqaured and displace 15 million people
40% of farmland will be lost (salt water intrusion and directly)
mangroves dissapearing, reducing protection from surges
funnelling bay of bengal

Answer 166

A

positives:

helped alleviate poverty by 10% by generating income opportunities
reduced disaster risk, road flooding 5 days a year rather than 20
environmental enhancement through growing trees

negatives:

disturbance of people and habitats especially during construction
permanent removal of natural vegetation
relocation of 200 people by road realignment
slow progress on road embankments

winners:

farmers, local community seeking jobs

losers:

environmentalists to some extent, community who are relocated, market sellers

Answer 167

A

composed of 33 atolls, low-lying pacific island nation
most of their 112,000 peole live on tarawa which is only 3m above sea level
they have already seen some islands sinking
rising sea surface temps also affetcing coral reegs, these are critical to sustaining atolls and their islands, coral bleaching
projections that by 2080, the risk of flooding here is likely to be 200x greater than at the start of the century
without adaptation, kiribati coud lose 34% of its 1998 GDP by 2050 due to SLR and climate change

Answer 168

A

1953 storm and high tides caused a 3m surge at night killing 307 people along the east coast (2100 in the netherlands)
20,000 homes flooded and damage estimated at £1.2 billion (our prices), farmland destroyed
no flood warning or forecasts, basic technology
2013 similar event with 5.8m storm surge on Lincolnshire
only 1400 homes flooded and no deaths, better monitoring to warn people for evacuation, sea defences protected 800,000 homes
thames barrier protected london

Answer 169

A

cat 5 2013, waves of up to 7m
economic impact estimated at $5.8 billion
fishing communities severly affected, sotrm destorying 30k boats and equipment
7000 people died, 4 million displaced
71,000 hectares of farmland affected
damage to oil barge led to over 1 million tonnes of oil leaking into the sea

management:

PAGASA gave warnings two days before, evacuation of 750k people
emergency shelters put up but not high enough to escape 5m surge
storm protection shelters destroyed due to poor construction
rebuilding efforts very slow, not much progress after one year
gov criticised for poor management (corruption)

Answer 170

A

sea levels have fluctuated and since 1850 they have been rising
the IPCC prediction models suggest that mean sea levels will rise by between 0.45m and 0.74m by 2100 and will continue rising for centuries
the low emission estimate for sea level change by 2100 is 28-61cm and the high emission estimate is 52-98cm
global sea levels have risen about 7cm over the past 22 years

Answer 171

A

unclear about how much temps will rise and so how much thermal expansion there will be
unclear as to how rapidly the ice sheets will melt. greenland ice sheet is more vulnerbale than antarctic as it is smaller and not as close to the pole
sea level rise is not equal all over the world
if greenland was to completely melt, sea level would rise by up to 7m, global warming melts the glaciers, ice caps and ice sheets and thaws permafrost, more water is then added leading to sea level rise

Answer 172

A

as seawater heats up by absorbing heat from the atmosphere, its volume expands. the ocean has stored 90% of the increased heat energy of the climate system in recent decades.

Answer 173

A

wave heights will increase in the arctic ocean as sea ice melts, increasing wave erosion will happen on Arctic coasts
there will be stormier seas, leading to more destructive waves. this combined with higher sea levels will make it easier to predict that erosion rates and coastal change will increase in the future

Answer 174

A

becuase many people have settled at the coast. By 2060, 12% of the world’s population will live in low elevation coastal zones.

flood risk increases in coastal zones thar are experiencing isostatic sinking

Answer 175

A

the likelihood of flooding taking place at the coast

Answer 176

A

1) eustatic sea level rise- caused by global warming, predicted by IPCC to be between 28 and 98cm by 2100
2) some evidence that global warming will increase wind speeds, wave heights, frequency of storm surges and the magnitude of tropical storms
3) population increase at the coast- by 2060, 12% will live in low elevation coastal zones. this increases demand for water extraction and means more is at risk.

Answer 177

A

1) dams- they block sediment getting to deltas to replace what is lost by erosion
2) groundwater extraction- can cause subsidience of land at the coast, reduces sediment volume,this is the sudden sinking or gradual downward settling of the ground’s surface
3) isostaticsinking- is causing south eastern Britain to sink
4) shape of the coast (topography)- in the case of the North Sea and the Bay of Bengal, the coast narrowing, acting as a funnel for weather systems, increasing storm surge heights, funnelling effect
5) height- low lying land especially islands (like the Maldives) and deltas are most at risk from sea level rise, temporary flood risk from storm surges and permanent flooding from SLR, archipelagos
6) vegetation removal- the destruction of mangrove forests food wood and charcoal exposes the coast to erosion. mangroves can reduce wave heights by 40%, stabilise sediment

Answer 178

A

depressions are areas of low air pressure generating surface winds that spiral into the centre of low pressure in anti-clockwise directions. they occur in mid-latitudes, like the UK.

Answer 179

A

it is a temporary rise in local sea level produced when a depression, storm or tropical cyclone reaches the coast

Answer 180

A

1) low pressure weather event (depression) creates a bulge in the sea
2) strong winds drive bluge towards the coast
3) land topography can funnel sea, increasing the height further
4) high tides can also increase height
5) sea rushes onto land as a surge

Answer 181

A

A rotational scar is a fresh, curved, unweathered and unvegetated rock surface on the cliff

Answer 182

A

the changing structure of a plant community overtimes as an intially bare surface is colonised by pioneer species and continues to develop

Answer 183

A

vegetation can stabilise unconsolidated sediment and protect it from erosion
1) plant roots bind together, making it harder to erode
2) plant stems and leaves covering the ground surface protect sediment from wave erosion and from tides and currents when exposed at high tide
3) prevent sediment from wind erosion at low tide
4) plant stems interrput the flow of water and wind, encouraging deposition and when the vegetation dies it adds its organic matter (humus) into the soil

Answer 184

A

these are the first plants to colonise freshly deposited sediment
they being the process of plant succession, during which other species and take over until a balance is reached, the changes allow other species to colonise
they modify the environment by: stabilising sediment, adding organic matter that retains moisture and reduces evaporation in sand

Answer 185

A

xerophyte
has extremely long roots which binds the dunetogether, up to 3m long
it has rhizomes which helps it keep anchored into the ground
holds the beach together, allows the dune to develop as it builds up dense vegetation
leaves roll inwards to kepp in moisture
when it dies out, it adds lots of organic matter in the soil, leading to further plant growth

Answer 186

A

when submerged, plants provide a protective layer so the sediment is not directly exposed to erosion by the tide
succulent stems to store water, continues to grow
dead organic matter is added to the sediment and helps to create soil which is less vulenrable than loose sediment
halophyte as it may be on higher levels, lack water

Answer 187

A

halophytes- salt-tolerant species

xerophytes- drought-resistant species

Answer 188

A

a seral stage

the end result is called a climax community

Answer 189

A

an accumulation of sand grains shaped into mounds and ridges by the wind in coastal areas

Answer 190

A

psammosere

Answer 191

A

embryo dunes

fore dunes

yellow dunes

grey dune

dune slac

mature dunes (climax community)

Answer 192

A

1) there is a plentiful supply of sand, a large area for sand to dry out and onshore winds to that blow sand landwards. sand accumulates to form an embryo dune.
2) pioneer species like marram grass colonise the dune, stabilising it and helps to trap more sand
3) a fore dune develops when enough sand has bee ntrapped an the dune starts to become more stable
4) now an established dune will become more vegetated by marram grass which provides organic matter to the sand and soil to devleop, improving the conditions
5) with soil now developed on the dune, it becomems a grey dune. this is permanent and conditions ar suited to a greater variety of species including heather and gorse
6) between dunes, dune slack develops. wind erosion can deepen them and they may be waterlogged in high tide conditions.
7) furthest inalnd is the climax community. there the soil is fully developed and the dune is fully stabilised and biodiversity is at its highest, trees can grow (birch)
e. g. Studland bay, Dorset

Answer 193

A

at first, the succession starts with halophytic plants capable of growing in salty, bare sand. as they trap more sand it develops into an embryo dune that alters the environmental conditions to one where xerophytic plants can flourish

Answer 194

A

the angle of wave attack
the process of longshore drift
tides
currents

Answer 195

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This is the main determinant of the direction of sediment transport (in the foreshore zone).
Where the wind is blowing directly onshore, the incoming swash transports the material direction up the beach at 90’ to the coastline.
Backwash then transports sediment perpendicularly back down to the beach to its original starting position.
Sediment is moved up and down the beach, but there is no net lateral movement.

A wave angle30’to the coastline produces the strongest longshore drift movement.
On most coastlines there is a dominant prevailing wind, so over time there is a dominant direction of longshore drift.

Answer 196

A

This is the flow of water in a particular direction, and they can transport sediment in the nearshore and offshore zones.
They can be driven by winds, or initiated by differences in water density, temperature or salinity.
Currents transport sediment over a variety of spatial and temporal scales:
The global thermohaline circulation connects four oceans and takes 500 years for one complete circuit.
Rip currents on the beach transport sediment a few metres out to sea for a few hours when the wind is blowing direcly onshore with the right strength.

Answer 197

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Tides are changes in sea level produced by the gravitational pull of the moon and the Sun.

The incoming and ebbing tide can create tidal currents in the nearshore and offshore zones that transport sediment.

Answer 198

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The Earth’s rotation combined with the gravitational pull of the Moon and Sun causes bulges in the water surface to shift position within each ocean or sea basin.

The tidal bulge in the water surface rotates around a location called a amphidromic point, which is determined by the morphology of the sea bed.

The sea may contain several separate amphidromic points.

Tidal range is the distance between high tide and low tide.

Tidal range is determined by the distance from an amphidromic point (range decreases with distance) and the shape of the coastline.

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