Along beaches,groins have ________.
A) solved the problem of beach drift
B) increased erosion rates immediately up-current from the groin
C) increased erosion rates immediately down-current from the groin
D) increased depositional rates immediately down-current from the groin

Question

Quizplus · Accepted Answer

Groins are structures made of concrete, wood or rock that are built perpendicular to the beach to prevent or limit sand from being transported across a bay or inlet. However, the construction of groins can lead to an increase in erosion rates immediately down-current from them, as they trap sand up-current and deprive beaches down-current of sand, leading to a deficit of sand on those beaches. Additionally, as water flows around a groin, it creates a scouring effect which further exacerbates erosion down-current from the groin.

Along Beaches,groins Have ________