Effect of sediment on resistance to flow in cobble and boulder bed rivers
Field and experimental evidence are presented to demonstrate the importance of the inflow of sand and gravel size sediments, released under extreme floods from watersheds and banks of streams, on resistance to flow in channels whose beds are formed of large size roughness elements such as cobbles, rocks and boulders. The released sediments fill the spacings between the large size roughness elements, and may inundate them completely, forcing the channel to behave as a sand bed channel at a much reduced resistance to flow coefficient. Under extreme conditions resistance to flow in these channels ...
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