工程堆积体坡面产流产沙特性的现场试验

发布时间：2018-03-29 06:25

本文选题：产流产沙　切入点：工程堆积体　出处：《水土保持学报》2016年04期

【摘要】：通过不同流量(35,45,55L/min)、不同坡度(24°,28°,32°)的野外放水冲刷试验,对工程堆积体坡面产流产沙的时空变化特性进行了研究。结果表明,径流强度与放水强度、产沙率密切相关,三者之间呈多元线性相关;坡面径流强度随冲刷时间呈波动式增大趋势;平均含沙量和产沙比均随坡度增大呈先增后减的趋势,峰值出现在坡度为28°时;径流强度和产沙率在冲刷时间为10min时出现第一个峰值;坡面产沙过程呈现产沙率剧增、波动和稳定发展3个阶段;累计产沙量与累计径流量呈线性关系。试验结果可为工程堆积体坡面水土流失预报模型的构建提供验证数据。
[Abstract]:Through the different flow rate (35,45,55L/min), different slope (24 degrees, 28 degrees, 32 degrees) the field scouring experiment of Engineering accumulation of spatio-temporal characteristics of slope runoff and sediment yield were studied. The results show that the runoff intensity and discharge intensity, the sediment yield was closely related to multiple linear correlation between the three; the slope runoff intensity fluctuations showed an increasing trend with scouring time; average sediment concentration and sediment yield decreased with increasing slope increased firstly and then decreased, the peak in the slope is 28 degrees; runoff intensity and sediment rate of the first peak 10min in the flushing time; the sediment process presents sediment the rate of increase, the 3 stage fluctuation and stable development; the cumulative sediment yield and cumulative runoff showed a linear relationship. The experimental results for the engineering slope provide validation data to construct soil erosion prediction model.

【作者单位】：西北农林科技大学水利与建筑工程学院;西北农林科技大学水土保持研究所;中国科学院水利部水土保持研究所;
【基金】：国家“十二五”科技支撑计划课题项目“农田水土保持关键技术研究与示范”(2011BAD31B01)
【分类号】：S157.1

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