River Geomorphology (20) - Grade Control Structures

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This clip shows a basic demonstration of the use of grade control structures to
manage energy and control vertical stability in a channel. Two rock grade
controls are placed in the channel. Dye shows relative velocity and depth. Note
the relatively low velocity upstream of the grade control at left (the upstreammost).
The structures are then removed. Note how velocity becomes uniformly
high throughout the reach (rather than low above the grade control structures
and high over them.) Immediately the sediment transport rate increases overall
and becomes uniformly distributed throughout the reach as the channel seeks a
new equilibrium condition.

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