What is the tidal datum in reference to in regions with semidiurnal mixed tides?
a. Mean lower low water
b. Mean low water
c. Tidal range
d. Mean tide
ANS: A
In mixed tide coastlines, the average of the lowest low tides is taken to determine datum points. This is
important because the mixed tides have two low tides of varying height. Information can be found in
the section The Dynamic Theory of Tides Adds Fluid Motion Dynamics to the Equilibrium
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