Aspect Ratio to Maximize Sediment Transport in Rigid Bank Channels |
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Authors: | Guoliang Yu Graeme Smart |
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Affiliation: | 1Professor, State Key Hydraulics Lab, Sichuan Univ., Sichuan 610065, China and now at School of Civil and Environmental Engineering, Nanyang Technological Univ., Singapore. 2River Engineer and Scientist, National Inst. of Water and Atmospheric Research, Box 8602, Christchurch, New Zealand.
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Abstract: | The continuity equation, Manning’s equation, Einstein’s wall correction procedure and sediment transport equations are combined to indicate channel aspect ratios which maximize sediment transport for a given water discharge in rigid-bank trapezoidal and rectangular channels with fixed slope. Higher aspect ratios are required to maximize sediment transport for channels conveying bed load than for those with a dominant suspended load. A total load equation predicts optimum aspect ratios lying in between those for bed load and suspended load channels. The equations imply that the optimum aspect ratio increases markedly as the channel bank to channel bed roughness ratio increases. The resulting optimum ratios are smaller than the aspect ratios of many natural rivers. |
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Keywords: | Sediment transport Suspended load Sediment control Channel improvements |
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