10 coastal risks

Question 1

isostatic change

Answer 1

a local rise or fall in land level

Question 2

eustatic change

Answer 2

rise or fall in sea level caused by a change in the volume of water

Question 3

accretion

Answer 3

occurs when sediment is added to a landform by deposition

it can build up to form new land, allowing a delta to go out to sea

Question 4

post glacial isostatic adjustment

Answer 4

uplift of land after the weight of ice above it has been removed

Question 5

ria

Answer 5

sea level rises flooding the river valley, making it much wider - drowning the river valley

Question 6

barrier islands

Answer 6

offshore sediment bar which is not attached to the coast

between 500m and 30km offshore

can be tens of kilometres long

Question 7

dredging

Answer 7

taking sediment from the seabed

either for construction sand or gravel or to deepen a channel so that large boats can navigate

Question 8

dissipation

Answer 8

describes how the energy of a wave is decreased by friction with beach material during the wave swash up the beach