Part 5. CHARACTER OF RIVER CHANNELS. Stages in maturity of landscape evolution revealed by channel morphology and adjacent flood plains. .
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CHARACTER OF RIVER CHANNELS
Hoover Dam channel is a transient mass, which can be excavated during extreme flows, as shown here on the San Juan River in Utah.
A total of 6 million yards of material was excavated at the dam site.
Asawn 2 x 6 plank was found in the river bed buried 50 feet beneath the low water surface. Geologists suggested that it was deposited from a debris flow in Callville Wash during the high water of 1922.
About 2 million cubic yards of material was excavated out of the river channel beneath the dam, revealing an incised inner gorge with fluting and boulders up to 12 feet across.
BRAIDED CHANNELS scour
Mechanics of saltation – which involves kinetic energy transfer between bouncing particles