Discussion
Assertion (A): Pre-filling reduces the downdrift impact of a new groyne field.
Reason (R): The compartments are already full so the natural drift is not intercepted to fill them.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason explains the mechanism. A new groyne field fills its compartments by capturing the drift, and until they are full nothing passes to the frontage beyond - so the downdrift erosion is at its most severe in the first years. Filling the compartments artificially at construction removes that phase altogether: the field starts in equilibrium and the natural drift passes through from the outset.
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