细沟水流的输沙能力是土壤侵蚀的重要参数之一,对于土壤侵蚀预报和土壤侵蚀过程模拟尤为重要。在不考虑土壤团粒结构条件下,根据集中稳定水流条件下侵蚀产沙随沟长增加而增加并将最终趋近于水流输沙能力的事实,提出了通过改变沟长来量...细沟水流的输沙能力是土壤侵蚀的重要参数之一,对于土壤侵蚀预报和土壤侵蚀过程模拟尤为重要。在不考虑土壤团粒结构条件下,根据集中稳定水流条件下侵蚀产沙随沟长增加而增加并将最终趋近于水流输沙能力的事实,提出了通过改变沟长来量测水流输沙能力的实验室水槽测量方法。相应地提出了根据试验数据计算水流输沙能力的函数表达式。用一种粉粘（黄土）土壤,进行了一系列（405次）室内水槽摹拟试验。采用五种坡度（5°,10°,15°,20°,25°）、三个流量（2,4,8 L min-1）的细沟侵蚀产沙数据,分析了输沙能力与沟坡、入流量的相互关系。展开更多
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. B...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.展开更多
文摘细沟水流的输沙能力是土壤侵蚀的重要参数之一,对于土壤侵蚀预报和土壤侵蚀过程模拟尤为重要。在不考虑土壤团粒结构条件下,根据集中稳定水流条件下侵蚀产沙随沟长增加而增加并将最终趋近于水流输沙能力的事实,提出了通过改变沟长来量测水流输沙能力的实验室水槽测量方法。相应地提出了根据试验数据计算水流输沙能力的函数表达式。用一种粉粘（黄土）土壤,进行了一系列（405次）室内水槽摹拟试验。采用五种坡度（5°,10°,15°,20°,25°）、三个流量（2,4,8 L min-1）的细沟侵蚀产沙数据,分析了输沙能力与沟坡、入流量的相互关系。
基金the National Natural Science Foundation of China (Grand No. 10672024)the Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China
文摘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.
