Question 68 What is the purpose of jetties? They prevent beach drift. They confi
ID: 106821 • Letter: Q
Question
Question 68
What is the purpose of jetties?
They prevent beach drift.
They confine the flow of a stream’s outlet to a narrow channel so that velocity will be high and sediment deposition will be low.
They minimize beach erosion.
They prevent headward erosion of a prominent land feature (e.g., a point).
a.They prevent beach drift.
b.They confine the flow of a stream’s outlet to a narrow channel so that velocity will be high and sediment deposition will be low.
c.They minimize beach erosion.
d.They prevent headward erosion of a prominent land feature (e.g., a point).
Explanation / Answer
c. They minimise beach erosion.
A very long, narrow structure of rock, concrete, or other material generally constructed perpendicular to the shore; commonly constructed in pairs at the mouth of a river or inlet to a lagoon, estuary, or bay; designed to stabilize a channel, control deposition of sediment, and deflect large waves.
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