the impact of coastal management on sediment cells

Question 1

what can happen from installing a sea wall?

Answer 1

reflect wave energy downdrift increasing wave energy and erosion elsewhere on the coastline.

Less erosion occurs in these
areas with the sea wall , so there is also less sediment in the areas with increased wave energy.

Less sediment reduces the beach size , so the cliff is more exposed to erosion from the higher energy waves

Question 2

what is the impact of building groynes?

Answer 2

reflect wave energy on downdrift areas as longshore drift can no longer transport sediment away from one stretch of coastline