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Study on the transport of suspended sediment in an open channel flow with permeable spur dikes

International Journal of Sediment Research 2011年第1期26卷 96-111页

作者： Ryosuke AKAHORI Syunsuke IKEDA Civil Engineering Research Institute for Cold Region Public Works Research InstituteJapan CTI Engineering Co. Ltd.JapanTokyo Institute of TechnologyJapan

The transport of suspended sediment in rivers with spur dikes is an important issue for bank protection and environmental *** experiments were performed to study the characteristics of the flow and the transport of suspended sediment in an open channel with permeable ***,the essentials of these characteristics were studied by comparing results of flume experiments on permeable and impermeable *** influence of the aspect ratio(d/l) of the interval between dikes(d) to the length of dikes(l) on these characteristics was then *** these experiments,the properties of horizontal eddies,turbulence structures,and suspended sediment concentrations were *** results show that the development of large-scale horizontal eddies requires some distance in a shear layer for permeable dikes,although they are periodically generated from the first dike in the case of impermeable *** basic structures of horizontal eddies are independent of the aspect ratio in the equilibrium region for permeable *** suspended sediment concentrations for cases of permeable dikes gradually decrease between the several upstream dikes and they approach a uniform distribution in the downstream region,although those in the case of the impermeable dikes are relatively uniform in the downstream direction.

关键词： Suspended sediment permeable spur dike Eddy structure Velocity distribution Power spectrum

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