Discussion
Consider the following statements about vertical seawalls.
1. They reflect a large proportion of the incident wave energy.
2. That reflection increases scour at the toe of the structure.
3. They increase the beach level in front of the structure.
Answer: B
The first two are correct and are the standard objection to reflective walls. The third is the opposite of what is observed, since beach lowering in front is the usual outcome. Reflection and beach level are inversely related.
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