Discussion
Consider the following statements about groynes.
1. They trap drift and widen the beach on the updrift side.
2. They can starve the frontage immediately downdrift of the field.
3. They add sediment to the littoral system as a whole.
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are the two faces of the same mechanism: what the groyne field holds on its updrift side is exactly what fails to reach the frontage beyond. Statement 3 is wrong and is the central misunderstanding about groynes - they redistribute the sediment already moving along the coast and add nothing to the littoral system. Only nourishment does that.
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