what is isostatic sea level rise Flashcards

1
Q

AO1: recent climate change

A

Since 1880 and the industrial revolution, sea levels
have increased by around 235mm

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2
Q

AO1: predicted climate change

A

(IPCC) predicts that sea levels may rise between
0.3 - 1.0m by 2100

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3
Q

AO1: what is eustatic sea level change

A

when global sea levels rise or fall across the whole planet. linked to thermal expansion and global warming

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4
Q

AO1: what is isostatic sea level change

A

when sea level change in relation to the height of the land. it is a localised change.

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5
Q

AO1 what is isostatic recovery

A

when ice glaciers melt it causes the coastline to rebound and rise again in the areas that were covered by ice. in the uk the south east subsides 1mm a year

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6
Q

AO1: major changes in the last 10,000

A

sea level increase slowed around 8,000 years ago , and levelled
at the current height around 3000 years ago

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7
Q

AO1: what are emergent landforms

A

he land has been raised in relation to the coastline, landforms such as arches, stacks and stumps and raised beaches

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8
Q

AO1: what are submergent landforms

A

Landforms of submergence occur when the sea level rises or the coastline sinks in relation to the sea

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9
Q

raised beaches (emergent)

A

when sea levels fall, a wave cut platform and its beach may be left behind forming a raised beach. some however are caused by isostatic movement

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10
Q

marine platforms (emergent)

A

same formation as raised beaches however are large and gently sloping. caused by high wave energy, increased from highe rlevels of storm surges

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11
Q

rias (submergen)

A

flooded river valleys by the coast

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12
Q

fjords (submergent)

A

flooded glacial valleys creating natural inlets. deeper in the middle section than they are at the mouth

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13
Q

dalmation coasts (submergent)

A

when valleys running parallel to the coast
become flooded
leaves a series of narrow, long rugged islands
best examples can be seen in Croatia.

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14
Q

holderness coast processes

A

-storm surges, strong waves from north east = long fetch
-6km spit and retreating cliffs
-uses a shoreline management plan
-rapid erosion worsened by climate change

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15
Q

pevensey bay processes

A

–long shore drift
-drainage systems less than 10m above sea level
-50km squared permanantly flooded
-

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16
Q

pevensey bay management

A

bulldozers redistribute shingle/sediment to manipulate accretion
-coast is vulnearble in winter to destructive waves, the beach is reprofiled
-natural defences to coastal flooding

17
Q

what pevensey management protects

A

-10,000 house
-SSII areas
-livestock and farms
-road and railway

18
Q

why do people live near the coast

A

recreational purpose and employment

19
Q

which kind of coasts are vulnerable

A

low-lying

20
Q

what are the 3 main risks of climate change on coasts

A

increased….
-flooding
-increaed erosion
-frequency of storms

21
Q

how many mm has sea level rise since 1880

A

1.7mm/year

22
Q

how may mm did sea level rise between 1991-2010

A

3.2mm/year

23
Q

how many degrees did global temps rise 1880-201

A

0.85C