Human Actions & Coastal Recession Flashcards

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1
Q

Rapid coastal recession is caused by physical factors (geological and marine) but can also be influenced by human actions such as

A

dredging, dams or coastal management

These actions affect the processes within the coastal system including those in the sediment cell

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2
Q

Dredging

A

The removal of sediment from rivers or the sea

This impacts on the amount of sediment being deposited at the coast

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3
Q

Dams
The construction of dams, traps ………….. behind the dam wall

It is estimated ……………..billion tonnes of sediment is stored behind the world’s dams and this increases by a billion tonnes each year

Like dredging, this starves the coast of sediment

A

river sediment

100

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4
Q

It is estimated that dams on the river Ebro in Spain have led to a ………% reduction in sediment downstream

A

93%

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5
Q

The reduction of sediment supplied to the coast due to dams and dredging leads to greater coastal erosion because:

A

Beaches decrease in size as they are not being supplied with sediment

Destructive waves have more impact by increasing the rate of coastal erosion

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6
Q

Coastal management

Coastal management can impact on the rate of recession because it affects the rate of erosion

In some areas coastal defences such as in places like Hornsea sea walls and rip rap reduce the amount of erosion

This slows recession of the coast

A
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7
Q

In other areas coastal management affects the movement of sediment
Groynes at Hornsea on the Holderness coast reduce

A

longshore drift

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8
Q

Groynes at Hornsea on the Holderness coast reduce longshore drift which has a affect on where

A

This starves areas down the coast such as Mappleton of sediment also known as terminal groyne syndrome

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9
Q

As with dams and dredging the reduced supply of sediment decreases………….. and increases….

A

beach size and increases the impact of destructive waves

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