Discussion
Consider the following statements about surge magnitude.
1. Shallow shelf seas experience larger surges than deep margins.
2. A long onshore fetch increases the wind setup at the coast.
3. Surge magnitude is independent of the water depth involved.
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: shallow shelf seas produce much larger surges, and a long onshore fetch increases the setup. Statement 3 contradicts the first - depth is one of the principal controls, which is why the North Sea, the Bay of Bengal and the Gulf of Mexico are all surge-prone while steep-margin coasts of similar exposure are not.
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