中文摘要：

为进一步揭示土壤侵蚀的内在规律,以某一试验小区为例,通过模拟不同地表粗糙度,分析了不同雨强条件下的坡面侵蚀产沙及泥沙颗粒粒径变化特征。结果表明：相同雨强和降雨历时下,粗糙度对坡面径流率、水流功率、径流含沙量和产沙率有显著影响;侵蚀泥沙的搬运形式与雨强和粗糙度均有关,而不同泥沙颗粒搬运方式是引起不同粗糙度坡面侵蚀产沙分异的重要原因。因此,坡面侵蚀产沙模型中应综合考虑地表粗糙度和泥沙粒径信息。研究成果可为水土保持规划设计和水土保持措施优化配置提供一定依据。

英文摘要：

In order to further reveal the inherent laws of soil erosion, by taking a plot as an example, the sediment yield and sediment gradation variation under different rainfall intensities were analyzed by simulating various slope surface roughness. The results show that under the same rainfall intensity and duration, the surface roughness has great influence on slope runoff rate, stream power, sediment concentration in runoff, and sediment yielding; sediment transport form is related to both rainfall intensi-ty and roughness. Differentiation cause in sediment yielding from slope with different surface roughness is the sediment transporta-tion forms. Therefore, surface roughness and gradation of sediment particles should be incorporated in a model of slope erosion and sediment yield.