What is the reference level to which a tidal height is compared to?
a. Datum
b. Amphidromic point
c. Tidal range
d. Bore point
ANS: A
The datum or zero point is the reference level tidal height is compared to. These points are either the
average level of lowest low tides in areas with semidiurnal mixed tides or the mean of all low tides in
areas with diurnal or semidiurnal coasts. Information can be found in the section The Dynamic Theory
of Tides Adds Fluid Motion Dynamics to the Equilibrium
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