The impact of topography on the sediment yield and runoff generation is an important project and at the same time is an little studied problem.
地形对降雨量、产流量和产沙量的影响及其估算是一个十分重要的课题，同时也是一个相当困难和研究基础十分薄弱的课题。
In this research, soil erosion and sediment yield was calculated by runoff shear stress, runoff energy consumption and runoff power theory respectively.
分别利用坡面径流剪切力、坡面径流能耗和坡面径流单位水流功率理论对坡面土壤侵蚀发生过程进行了研究。
With delay of runoff yield time, the nitrogen concentrations in runoff and sediment drop off, whereas, the accumulation amounts of nitrogen loss rise gradually.
泥沙氮素含量随着产流时间的延长呈下降趋势，而流失累积量测呈逐渐增大趋势。
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