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Eddies generated by a a subcritical bottom slope.
Upstream the bottom has a strong enough slope to sustain a continuous unbroken current (i.e., the slope is supercritical).
In the region between 0 and 200 kilometers the slope is reduced to a subcritical value so the current can only exist there as a chain of eddies.
Farther downstream the slope returns to the high supercritical upstream values so the eddies merge and form a continuous current similar to the upstream flow.
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Red Sea Video Feature
Part of a CBS Video program describing the Red Sea crossing theories.
Discovery Channel program describing the Red Sea crossing theories