粗糙度对坡面侵蚀及泥沙分选性影响试验研究

发布时间：2018-05-18 19:38

本文选题：粗糙度 + 泥沙分选　；参考：《人民长江》2017年17期

【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。
[Abstract]:In order to further reveal the inherent law of soil erosion, the variation characteristics of sediment yield and sediment particle size of slope erosion under different rainfall intensity were analyzed by simulating different surface roughness in an experimental plot. The results show that under the same rainfall intensity and rainfall duration, roughness has a significant effect on runoff rate, flow power, sediment content and sediment yield, and the transport form of erosion and sediment is related to rain intensity and roughness. The difference of sediment yield on different roughness slope is caused by different sediment particle transport methods. Therefore, the information of surface roughness and sediment particle size should be taken into account in the sediment yield model of slope erosion. The research results can provide some basis for planning and design of soil and water conservation and optimal allocation of soil and water conservation measures.
【作者单位】：长江科学院水土保持研究所;
【基金】：国家自然科学基金项目(41271303,40901135) “十一五”科技支撑计划课题(2008BAD98B02)
【分类号】：S157.1

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