Essay on Transitions in Water
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Tides force seawater inland as a countercurrent
and produce a saltwater wedge below the freshwater surface waters (Bellamy
62...
Because fresh water is lighter, or less dense, than salt water, unless the
two are mixed by the tides or winds, the fresh water remains at the surface,
resulting in a salinity gradient...
The Keys To Unlocking Transitions in Water
When examining waters transition from fresh to salt as well as from salt to
fresh one quickly finds the importance of estuaries
...
In coastal lagoons,
where there are large open waters, small tidal range, and low freshwater inputs,
wind is usually a more important mixing agent than tides...
Partially mixed
estuaries have moderate freshwater inflow and tidal range...
Salt water and
fresh water mix to form brackish water...
The three main estuarine
ones-saltwater, brackish, and freshwater-can shift seasonally and vary greatly
from one area to another because of changes in river flow...
Where there is a large tidal
range but little freshwater inflow mixing is more complete...
The most highly stratified estuaries are the ones that receive a large
amount of fresh water but that have a relatively low tidal range...
The brackish zone of
such estuaries may have a salinity of 2 to 10 parts per thousand (ppt), compared
with the salinity of salt water, which is about 35 ppt
