What adverse effect do groins and jetties both have on coastal erosion?
A)They stop littoral transport of sand and starve down-drift areas of sand.
B)They reflect waves across the beach.
C)They cause the waves striking the structure to increase in height and erosive power.
D)They rob the waves of their energy to transport sand.

Question

Quizplus · Accepted Answer

Both groins and jetties interrupt the natural movement of sand along the coast, preventing it from moving down-drift and replenishing eroded beaches. This leads to increased erosion and the loss of beach habitat.

What Adverse Effect Do Groins and Jetties Both Have on Coastal