During a dry summer period, the average salinity entering a small bay over 6.25

Question

During a dry summer period, the average salinity entering a small bay over 6.25 hours on a rising tide is 28. On the falling tide of 6.25 hours, the average salinity is 27.5. A stream enters the bay with a gaged flow of 42 cubic feet per second.

The tide range is 6 feet and the diameter of the circular bay is 7400 ft at high water. At low water, the diameter of the bay is 6000 feet.

Assuming all the fresh water entering the bay is from stream flow and ground water, how much ground water entered the bay over the complete tidal cycle of 12.5 hours?

Explanation / Answer

Sea water contains about 3.5% salt on average, plus smaller amounts of other substances. The physical properties of sea water differ from fresh water in some important respects. It freezes at a lower temperature and its density increases with decreasing temperature to the freezing point, instead of reaching maximum density at a temperature above freezing. The salinity of water in major seas varies.Assuming all the fresh water entering the bay is from stream flow and ground water over the complete tidal cycle of 12.5 hours will be 6000* 6=36 cu.ft.

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