水科学进展2018，Vol.29Issue(2)：151-158,8.DOI:10.14042/j.cnki.32.1309.2018.02.001
对坡面径流挟沙力研究的几点认识
Several understandings for sediment transport capacity by overland flow
摘要
Abstract
Sediment transport capacity of overland flow,which is the maximum equilibrium sediment load that a flow can transport,is a key concept for developing process-based soil erosion models because it plays a pivotal role to determine soil detachment rate and sediment transport.Few studies have been conducted to investigate the mechanism of sediment transport capacity by overland flow on steep slopes.In this paper,based on the systematic definition of sediment transport capacity of overland flow,the influences and their mechanisms of hydraulic properties of overland flow and sediment characteristics on sediment transport capacity were deeply analyzed.Sediment transport capacity of overland flow has great spatial and temporal variations due to the comprehensive effects of precipitation,topography,soil,vegetation,land use,sealing formation,rill development,and gravel covering.Therefore,it is very difficult to measure sediment transport capacity of overland flow directly in field conditions.The commonly used methods to determine sediment transport capacity of overland flow can be categorized into the modification from river sediment transport capacity formula,the rational method,the model simulation,and the direct measurement.The advantages and disadvantages of each method were compared and analyzed.Further studies should be focus on the measuring methodology and techniques for sediment transport capacity of overland flow,the hydro-dynamic mechanism of sediment transport process,sediment transport capacities of typical soil types,transport capacity formula development and performance evaluation,and sediment transport capacity of overland flow under changeable conditions.It is helpful to summarize the conclusions of different studies,promote the research on sediment transport capacity of overland flow,and improve the prediction precision of the process-based soil erosion models for better service to water and soil conservation planning and design.关键词
土壤侵蚀/坡面径流/泥沙输移/影响因素/确定方法Key words
soil erosion/overland flow/sediment transport/influencing factors/determining methods分类
农业科技引用本文复制引用
张光辉..对坡面径流挟沙力研究的几点认识[J].水科学进展,2018,29(2):151-158,8.基金项目
国家重点研发计划资助项目(2017YFC0504702) （2017YFC0504702）
国家自然科学基金资助项目(41530858)The study is financially supported by the National Key R&D Program of China(No.2017YFC0504702) and the National Natural Science Foundation of China(No.41530858). （41530858）
