Answer :
The turnover time of fresh water in an estuary, or the amount of time needed to replace the fresh water already present in the estuary with freshwater intake, is commonly understood to be the flushing time of an estuary.
The amount of freshwater an estuary contains in relation to the overall pace of freshwater intake is what determines how long it takes for it to flush. As freshwater inflow rises, flushing time lowers. Calculations of the estuary's volume, volume-weighted average salinity, and salinity beyond the seaward boundary can be used to determine the flushing time.
The freshwater replacement approach is what it is known as. By injecting a conservative tracer, such dye, into the freshwater inflow at a constant concentration until the mass or average concentration of tracer in the estuary at a specific tide stage achieves equilibrium, flushing time can also be calculated. Concentrations will roughly drop exponentially as tracer is flushed from the estuary after tracer input is stopped.
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