Discussion
Match each revetment armour type with its characteristic.
List I
A. Rock armour
B. Concrete blockwork
C. Gabion mattress
D. Grouted rock
List II
1. cheap but with a short life in the surf
2. rough, permeable and readily repaired
3. rigid, low permeability, prone to cracking
4. regular, less permeable, harder to repair
Answer: A
Correct answer: A-2, B-4, C-1, D-3
Rock armour is rough and permeable, dissipates well, and can be repaired by placing more rock. Concrete blockwork is regular and tighter, so it reflects more and is harder to repair once units are displaced. A gabion mattress is cheap but its wire baskets abrade and corrode quickly in the surf, giving a short life. Grouted rock is rigid and nearly impermeable, so it develops pressure behind it and cracks.
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