The west coast of the United States receives two high tides and two low tides of varying heights per
day. What kind of tidal pattern is this?
a. Diurnal tides
b. Semidiurnal tides
c. Semidiurnal mixed tides
d. Spring tides
ANS: C
The high tides and low tides of semidiurnal mixed tides are significantly different from one another.
This pattern is the result of the blending of diurnal and semidiurnal tidal patterns in the region.
Information can be found in the section The Dynamic Theory of Tides Adds Fluid Motion Dynamics to
the Equilibrium.
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