Discussion
Match each seawall profile with its characteristic.
List I
A. Vertical
B. Curved or recurved
C. Stepped
D. Sloping revetment
List II
1. dissipates energy on successive horizontal treads
2. highest reflection and the greatest toe scour
3. lowest reflection with the greatest dissipation
4. deflects the uprush seaward at the crest
Answer: D
Correct answer: A-2, B-4, C-1, D-3
The four profiles form a sequence from reflection to dissipation. A vertical face throws almost all the energy back, which gives the highest reflection and the worst toe scour. A recurve adds a lip that turns the uprush seaward at the crest, cutting overtopping. A stepped face breaks the uprush on successive treads. A sloping revetment, rough and permeable, dissipates most and reflects least - at the cost of the widest footprint.
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