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sediment transport capacity of hyperconcentrated flow

Science china(Physics,Mechanics & Astronomy) 2008年第8期51卷 961-975页

作者： shu anping1,2.& fei xiangjun2.1 school of environment & key laboratory of water and sediment sciences,Ministry of {2.,beijing normal university,beijing 100875,china 2.State key laboratory of Hydroscience and Engineering,Tsinghua university,beijing 100084,china school of environment & {2. laboratory of water and sediment sciences Ministry of Education Beijing Normal University Beijing 100875 China State key laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China

As one of the most important components of river mechanics,sediment transport capacity of sediment-laden flows has attracted much attention from many researchers working on river mechanics and hydraulic engineering. Based on the time-averaged equation for a turbulent energy equilibrium in solid and liquid two-phase flow,an expression for the efficiency coefficient of suspended load movement was derived for the two-dimensional,steady,uniform,fully-developed turbulent flow. A new structural expression of sediment transport capacity was achieved. Using 115 runs of flume experimental data,which were obtained through two kinds of sediment transport experiments in the state of equilibrium,in combination with the basic rheological and sediment transporting characteristics of hyperconcentrated flow,the main parameters in the structural expression of sediment transport capacity were calibrated,and a new formula of sediment transport capacity for hyperconcentrated flow was developed. A large amount of field data from the Yellow River,Wuding River,and Yangtze River,etc. were adopted to verify the new formula and good agreement was obtained. These results above contribute to an improved theoretical system of river mechanics and a reliable tool for management of rivers carrying high concentration of sediments.

关键词： hyperconcentrated flow turbulent energy equilibrium efficiency coefficient sediment transport capacity

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Characteristics of particle size distributions for the collapsed riverbank along the desert reach of the upper Yellow River

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International Journal of sediment Research 2016年第4期31卷 291-298页

作者： anping shu Fanghua Li Hai{2. Liu Guosheng Duan Xing Zhou school of environment Key Laboratory of Water and Sediment Sciences of Ministry of EducationBeijing Normal University key laboratory of {2. and sediment sciences of Ministry of education Beijing Normal University River Authority of Chaoyang District school of environment Beijing Normal University

As a result of the interaction between hydrodynamics and the effects of gravity,riverbank collapse is a common occurrence in the desert reach of the upper Yellow River(also called as Ningxia-Mongolia Inner reach),of which the riverbank may be divided into three types such as sandy riverbank in the widevalley desert reach,silt-deposition riverbank on the fluvial plain and silt-sandy *** characteristics of both typical riverbank collapse and the particle size distributions(PSDs) for collapsed riverbanks of sandy,silt-deposition,and silt-sandy types were determined from analysis of data obtained from the field *** was found that particles from the silt-deposition riverbank had the smallest median size and those from the sandy riverbank the largest,with those from the silt-sandy riverbank being intermediate in *** PSDs of the sandy and silt-deposition riverbanks exhibited double-peaked and single-peaked structures,respectively,while those of the silt-sandy riverbank exhibited multiple ***,the corresponding to three kinds of riverbank collapse mechanisms were revealed,These results are significant with regard both to the understanding of river dynamics and to the planning of river harnessing projects.

关键词： Particle size distribution Desert reach Riverbank collapse Yellow River

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