Discussion
All of the following affect the water level at a coastal site EXCEPT
Answer: B
Correct answer: how saline the water in the nearshore happens to be
Salinity affects density by a fraction of a per cent and has no appreciable effect on the water level at a site. The other three all contribute directly: the astronomical tide and the storm surge make up the still water level, and wave setup raises the mean level inside the surf zone by a further amount that can reach several tenths of a metre.
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