Discussion
Match each hard structure with its principal function.
List I
A. Seawall
B. Groyne
C. Detached breakwater
D. Revetment
List II
1. reducing wave energy reaching the shore
2. protecting the land directly behind it
3. armouring a slope against wave attack
4. trapping longshore drift to widen a beach
Answer: D
Correct answer: A-2, B-4, C-1, D-3
Each structure has one primary purpose. A seawall protects the land immediately behind it. A groyne intercepts longshore drift so that a beach builds on its updrift side. A detached breakwater sits offshore and reduces the wave energy reaching the shore in its lee. A revetment armours a slope - of a cliff, an embankment or a dune - against direct wave attack.
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