Hydrosphere Flashcards

1
Q

What are the three main human uses of water? What are the % totals?

A

Agriculture 70%
Industry 22%
Domestic use 8%

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2
Q

What is the major water consuming activity of Agriculture?

A

Irrigation

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3
Q

What is the global differences for HICs/LICs in terms of agriculture water use?

A

HICs:
- irigation is mechanised e.g. sprinkler, timed feeds
- lots of water available for agricultural areas

LICs:
- irrigation channels
- water loss through evaporation

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4
Q

What are the major water consuming activities for industry?

A

cooling
heating
washing
solvent

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5
Q

What is the global differences for HICs/LICs in terms of industry water use?

A

HICs:
- large scale
- large amounts of water needed
e.g. steel

LICs:
- smaller scale cottage industries
- less water demand
- BUT MNC location in developing countries raises demand
e.g. India’s drinks manufacturing needs over 1 million litres a day

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6
Q

Give 2 examples of water need for common products

A

17,196 litres/kg chocolate
1608 litres/kg bread

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7
Q

What are the major water consuming activities in domestic use?

A

Flushing toilets
Hygiene
Washing clothes, dishes

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8
Q

What is the global differences for HICs/LICs in terms of domestic water use?

A

HICs:
- lots of facilities requiring water use
e.g. toilets, showers, baths, washing machine, swimming pools…
- UK person uses 142L a day
- 100% uses improved water supply

LICs:
- many people do not have access to piped water
- they may collect it and bring it home from a well or stream (disease?)
- they use it sparingly
- Sudan person uses less than 6L a day
19.3% rural pop uses unimproved water sources
2 billion people do not have access to safe water

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9
Q

What percentage of the world’s water is held in:
a) the ocean (salt)
b) freshwater

A

a) 97.5%
b) 2.5%

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10
Q

What are the three forms water takes?

A
  1. solid (ice, snow)
  2. liquid (oceans, rivers lakes, rain)
  3. gas (water vapour) in atmosphere
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11
Q

Why is water referred to as a renewable resource?

A
  • the processes of the water cycle is constantly renewing the surface water and groundwater stores
  • precipitation feeds rivers and streams, and also infiltrates into the ground to replace water we use
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12
Q

What is the natural hydrological cycle?

A

the continuous movement of water between rivers, oceans, the atmosphere and the land (storage reservoirs)

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13
Q

Why is the natural hydrological cycle a closed system?

A

Because there is as much water as there will ever be - there is no external factor which can change that

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14
Q

What do we mean when we refer to the natural hydrological cycle being in dynamic equillibrium?

A

the amount of water in circulation does not change and each storage reservoir remains constant over long periods of time as the processes cancel each other out

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15
Q

What is residence time?

A

the average length of time water stays in a reservoir (auifers, oceans etc) before moving into another reservoir

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16
Q

How do we calculate residence time?

A

residence time = volume of water/rate of transfer

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17
Q

What 2 main processes drive the hydrological cycle?

A
  1. Solar energy
    - provides the energy for evaporation
  2. Gravitational/Potential energy
    - the downwards movement of precipitation
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18
Q

Give 4 properties of liquid water that is useful for life

A
  1. stays liquid over huge temp range
  2. anomalous expansion
  3. thermally stable + excellent solvent
  4. high spec heat capacity
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19
Q

Why is the state of water as a liquid important?

A
  • essential for metabolism
  • useful for aquatic organisms which avoid freezing
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20
Q

Why is it important that water is both thermally stable and an excellent solvent?

A
  • ideal for chemical reactions
  • all enzyme reactions e.g. photosynthesis occurs in solution
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21
Q

Why is high specific heat capacity of water important?

A
  • it requires a lot of energy to raise water temperature, and so a lot can be lost before water temp falls
  • so can regulate climate and reservoir temperature stability
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22
Q

Why is anomalous expansion important?

A
  • water most dense at 4 degrees and freezes top down
  • the ice crust forming on the top of the water body insulates the water underneath
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23
Q

What factors are causing global water demand to increase?

A
  • population growth/urbanisation
  • increased affluence causing increased use per capita
  • increased irrigation
  • industrialisation
  • climate change
  • pollution
  • climate change
  • ‘virtual-water’ and ‘Western Diet’ use increase
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24
Q

Why is population growth/urbanisation increasing the global demand for water?

A
  • increased birth rate/immigration means more people need to use water
  • urban pop expected to more than double 1995-2025, urban areas need more water but infr. may be poor
  • more people also need more food, so increased irrigation
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25
Q

Why is increased affluence (leading to increased use per capita) increasing the global demand for water?

A
  • more money can be spent on washing and appliances that use more water e.g. swimming pools, washing machines, despite modern water-saving machines
  • in poor communities, domestic use may be limited to how much you can carry
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26
Q

What is the effect of increased irrigation on water demand?

A
  • subsistence farming relies on natural water availability, and so will adapt to different types of farming if water is unavailable e.g. nomadic herding vs arable farming
  • expansion of commercial agriculture increases income that can be invested in irrigation schemes, which may pump water from storage reservoirs
  • irrigation now uses more water than all other human uses combined
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27
Q

Why does de-industrialisation decrease water demand?

A

-heavy industry such as chemical and steel industries or paper making use lots
- service industries use little except for domestic workers

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28
Q

Why does climate change increase water demand? (Lots)

A
  • hotter summers = drier land
  • more water needed for irrigation, domestic, agriculture, drinking etc
  • disrupts precipitation
  • rising sea levels = salinisation of groundwater
  • glacier melt that previously was a water supply

-droughts/floods spread disease

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29
Q

Why does the increased use of ‘virtual-water’ and the ‘Western Diet’ increase water demand?

Give examples

A
  • imported food had ‘v-w’ embedded in, and rich Western consumers don’t realise how much water is needed to produce the goods

e.g. tea/coffee

  • ‘Western Diet’ = more meat and dairy which requires huge amounts of water to produce

e.g.
1kg rice = 3,500L
1kg beef = 15,000L

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30
Q

How does pollution increase water demand?

A

reducing the availability of water in any developing countries that lack the energy resources and infrastructure to treat waste water so that it is potable

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31
Q

What is ‘water withdrawn’?

A

the total volume removed a water source e.g. lake, river

  • a portion of this water may be returned to its source to be used again e.g. hydroelectric power
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32
Q

What is ‘water consumed’?
Give an example

A

the amount of water removed for use and not returned to its source e.g. agricultural irrigation

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33
Q

Why does a country’s water usage per unit of GDP fall once they have reached a certain level of development?

Give examples

A
  • awareness of potential problems of shortage means investment in water conservation
  • agri. relies less of irrigation/irrigation techniques become more efficient via water recycling/timed sprinklers etc
  • industry based economy uses more water, so when they switch to service based they consume a lot less

e.g. European countries such as the UK
Some parts of the USA

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34
Q

Why do water conflicts occur?

A

most continents have transboundary rivers, there are 276 transboundary river basins in the world

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35
Q

Give some water conflicts

A
  • upstream vs downstream
  • water use priorities
  • TNC’s
  • pollution and payment
  • leasing land
  • land use and water reduction from some areas
36
Q

How can an upstream country cause water conflict?

A
  • they can take more and more water, leaving less for the next country along, and if this continues through several countries then the country at the bottom of the chain is severely affected
37
Q

How can water use priorities cause water conflict?
Give an example

A
  • countries disagree about water use priorities

e.g. should water be used for drinking water or crop growth?

38
Q

How can TNCs cause water conflict?

Give an example

A

they can use local water supplies unsustainably and deprive people of the water they need for drinking, sanitation and agriculture

e.g. Coca-Cola India

39
Q

How can pollution and payment cause water conflict?

A

countries can pollute a river that then flows into another country and this may result in conflict over who pays for treating the pollution

40
Q

How can leasing land cause water conflict?

Give an example

A

wealthy countries in the middle east e.g. Saudi Arabia have their own production of cereals to conserve their groundwaters, and instead they are leasing large areas of land in poorer countries e.g. in Africa to grow their crops

  • this increases demand in areas that are already water stressed and deprives local populations access to their own water
41
Q

How can land use and water reduction from some areas cause water conflict?

Give an example

A

This leaves less water for the countries in the region that are expected to experience large increases in population and may be vulnerable to extreme weather events such as drought

Himalayan nations are building dams for flood control, water supply and HEP

  • in the Himalayas the Ganges is increasing engineered to control flow and divert water
    e.g. the Tehri Dam in India diverts 270m gallons of drinking water daily
42
Q

What is spatial mismatch?

A

The rainfall often isn’t where the greatest demand for water is!

43
Q

What does the water AVAILABILITY look like in the UK?

A

NW = more water, less people, less demand
- lots of water available

SE =less water, more people, growing pop, more demand
- insufficient water available

Greatest demand: summer
Greatest demand: winter

Storage reservoirs and transfer schemes

44
Q

What does the changing water situation look like in the UK?

A

household demand will increase
non household will decrease

15L used per day for drinking water and food prep - out of 142L, that’s a lot of time and money wasted on treatment.

45
Q

What are the human impacts on the hydrological cycle?

A

deforestation
agriculture
urban development
global climate change

46
Q

What impact is deforestation having on the hydrological cycle?

A
  • vegetation intercepts rainfall that then may evaporate before it reaches the ground
  • tree roots take up water from the soil
  • without trees there will be lower rainfall downwind as more water infiltrates ground/flows into streams
47
Q

What impact is agriculture having on the hydrological cycle?

A

Water does not infiltrate easily into soil compacted by heavy machinery/livestock
- soil moisture decreases
- runoff increases

Irrigation increases evaporation

Loss of soil biota (e.g. worms) reduces infiltration, increases runoff, reduces water retention

48
Q

What impact does urban development have on the hydrological cycle?

A

Increased impermeable surfaces (concrete, tarmac)
- increased runoff/flooding
- reduced infiltration

49
Q

What are the impacts of global climate change on the hydrological cycle? (short)

A

Higher global temps
- affect rates of melting/evaporation/condensation/wind patterns
- all affects precipitaion rates/times/location

Rapid snow/ice melt
- normally reduces extremes, when falls seasonally
- now, melt just increases flooding

50
Q

What are aquifers?

A

rocks which hold water that is then exploited as a resource

51
Q

What are the essential characteristics of aquifers?

A

High porosity
Permeability
Associated geological structures

52
Q

What is porosity?
Why do aquifers need it?
Give an example of rocks that are porous

A

The measure of the proportion of a rock’s volume that is space that can hold water

So it can hold water

Chalk, limestone, sandstone

53
Q

What is permeability?
Why does an aquifer need it?
Give a bad example

A

the measure of the ease with which water can flow through the rock because of the interconnections/size between pore spaces

So water can move through the pores and fissures

Clay is porous, but the pores are too small for water to flow through easily

54
Q

What associated geological features do aquifers require and why?

A

Impermeable rock below
- stopping the water draining out

Permeable rock above it
- allowing it to recharge

55
Q

Why are aquifers a good option as a water source?

A
  • cheaper than reservoirs
  • no evaporation loss
  • rainwater may take centuries to reach the water table, therefore it is usually clean so needs less treatment
56
Q

How much of the UK’s water supply is from aquifers?
Why isn’t it more?

A

1/3

Because if we exploited all of them, the stuff on top would collapse

57
Q

Why is recharge of aquifers important?

Consider:
a) precipitation recharge
b) ice age recharge
c) ancient aquifers

A

If the aquifer is recharged by rainfall percolating to the ground, abstraction can be sustainable if we do not exceed the recharge rate

If they are the aquifers recharged during the last ice age 10-20,000 years ago, they may not be getting recharged now and exploitation is unsustainable, and could lead to shortage

If they are ancient, their water if often saline and so when used for irrigation, they can cause soil salination (evaporation)
- osmotic dehydration/death of crops

58
Q

What are the two types of aquifers?

A

Confined - covered on all sides by rock

Unconfined - partially exposed

59
Q

How can we monitor aquifer depletion?
Why is it important?

A
  1. checking the level of the water table in wells or boreholes using electronic pressure sensors
    - slow
    - difficult to coordinate on a large scale
  2. Satellite data to observe gravitational differences on the Earth’s surface
    - GRACE
60
Q

How does GRACE work?

A
  • gravitational field is determined by features and topography including aquifers and groundwater on the surface
  • satellite orbit is partially gravity determined
  • changes in distance between twin GRACE satellites indicate changes in grav. field
  • whole Earth surveyed every 30 days
61
Q

What does GRACE stand for?

A

Gravity Recovery And Climate Experiment

62
Q

How can we replenish aquifers?

A
  1. Reduce abstraction levels
  2. Alternative supply sources
  3. Recharging Aquifers
63
Q

How can we reduce aquifer abstraction rate?

A

Industrial & Agricultural - licenses
Domestic - conservation

64
Q

What alternative supply sources can replace aquifers?

A

Increasing capacity of other stores e.g. reservoirs

65
Q

How can we recharge aquifers?
Give an example

A

Put water back into them

North London Aquifer Recharge Scheme (NLARS)
- tops up a chalk aquifer with treated water after heavy rainfall to use as a back up resource to boost supply during droughts

66
Q

What effect can over-exploitation of rivers have for drinking water?

A
  • water and food shortage
67
Q

What effects can over-exploitation of rivers have for industry?

A
  • high concentration of pollutants in the river
  • loss of productivity and jobs
68
Q

What effects can over-exploitation of rivers have for agriculture?

A
  • not enough for irrigation
69
Q

What strategies are implemented in water conservation?

A
  1. Low volume uses
  2. Recycling used water
  3. Pollution Control
  4. Reduced wastage
70
Q

What methods are included within low volume water uses?

A
  • Low-water appliances
  • Xeriscaping
  • Low-volume irrigation
71
Q

How do low-water appliances contribute to low volume water uses?
Give examples

A

They limit the flow rate while maintaining a high water pressure, or use minimum water

  • low flow shower heads
    (10-15L/minute reduced to 6/8L)
  • dishwashers
  • dual flush toilets
72
Q

What is xeriscaping?

A

Managing parks/gardens/verges etc by planting them with more drought resistance vegetation so they require less watering

73
Q

How does low-volume irrigation work?

A

drip irrigation delivers water directly to plants which leads to lower evaporation losses than overhead sprays

74
Q

How do we recycle used water?

A

GREY WATER
- water that has already been used but is still quite clean can be reused e.g. bath water used to flush toilets/water gardens

75
Q

Why do we need to implement water pollution control?
Can we treat it?

A
  • many activities e.g. industry produce contaminated water which cannot be reused and may pollute other water sources such as rivers
  • effluent treatment processes usually treat it
76
Q

Give examples of water pollution control

A
  • oil pollution treatment
  • sewage treatment
  • acid mine drainage
  • heavy metal waste control
  • landfill leachate treatment
  • buffer strips next to rivers to reduce fertiliser runoff
77
Q

Why is there a lot of water wastage in the UK?

A
  • water infrastructure in poor condition
  • 20% water intended for public supply is lost from leaking pipes
  • leaking appliances e.g. taps
  • fixed fees do not encourage careful use
  • water consuming appliances
78
Q

How can we reduce water wastage UK?

A
  • repair and maintain leaks and breaks
  • install water meters charging customers to pay to the volume of water used: less water will reduce the bill
79
Q

What percentage of water usage in the home do toilets account for?
How can we reduce this?

A

30%

  • don’t flush every visit
  • install water displacement device reducing water per flush
  • install dual/low flush
80
Q

Give examples of how can we reduce personal water usage

A
  • showers not baths
  • use new/water saving appliances
  • minimum kettle fill
  • recycle water from washing
  • collect gutter water/water butts
  • xeriscaping
81
Q

Why might water need treatment before use?
How many tests are there for UK drinking water?

A

natural problems
human problems

  • 3 million tests - 99% pass
  • 1% includes faecal coliforms, lead, pH etc…
82
Q

Why is surface water stored in open storage reservoirs before treatment?

A
  • dilutes contaminants from incoming water with pre-held water
  • debris/sediments settle out
  • sunlight breaks down organic material
  • some bacteria die
83
Q

What criteria does water have to pass to be deemed usable?

A

pH
Heavy Metals (e.g. lead)
Dissolved Oxygen
Calcium content
Cl2 retention
Turbidity
Pesticides
E. coli
Clostridium perfringens

84
Q

How does mercury in water sources affect the environment?

A
  • influences by abiotic factors in aquatic ecosystems, like eutrophication conditions (low O2 levels, low pH, increased sulfate conditions) - EUTROPHICATION ISSUES
  • NEUROTOXIN: affects development in children e.g. learning, speaking and kills brain neurons
  • DENATURES ENZYMES
  • PLANTS: chlorosis and reduced growth
  • FISH: gill damage, blindness, reduced gut nutrient absorption

Marine algae bioaccumulates it: 100x conc of surrounding water. Pollutant therefore becomes more concentrated at each trophic level

85
Q

Give an example of mercury issues

A

MINAMATA BAY, JAPAN
1932-68, fertiliser and plastic factory dumped 27 tonnes of mercury-containing products (e.g. mercury sulfate) into the bay. Eventually entered the food chain, and in 1950s people developed symptoms e.g. limb numbness, slurred speech, restricted vision, developing into serious brain damage
At least 7 people died