黄土区五种土壤抗冲性试验分析

发布时间：2018-05-06 13:39

本文选题：下切冲刷 + 坡度　；参考：《灌溉排水学报》2017年04期

【摘要】：通过室内放水冲刷实验,分析了黄土高坡5种土壤在不同坡度下的下切冲刷过程及影响冲刷的坡度、水流特征以及水流含沙量等影响因素。结果表明,在流量为120 L/h条件下,5种土壤的抗冲系数均随着坡度的增大而降低,且呈现指数回归关系,决定系数R~2较高,土壤抗冲性大小依次为杨凌黏壤土延安砂质黏壤土周至黏壤土志丹砂质壤土靖边砂质壤土;5种土壤的抗冲系数和水流流速均呈现出负相关的线性变化规律;5种土壤的冲刷强度基本都随着坡度的增加而增加,随着冲刷时间的推移,冲刷强度逐渐减小,且坡度越大,前期的冲刷强度越大;5种土壤的抗冲系数与水流含沙量呈现出负相关的线性变化规律,决定系数R~2在0.857 7~0.957 5之间,随水流含沙量的变化,抗冲性越好的土壤其本身的抗冲系数变化越显著。
[Abstract]:In this paper, the down-cutting scour process of five kinds of soils on loess high slope under different slopes and the influencing factors such as slope, flow characteristics and sediment content of water flow were analyzed through indoor water discharge scour experiments. The results showed that under the condition of 120 L / h flow rate, the erosion coefficient of five soils decreased with the increase of slope, and the exponential regression relationship was presented, and the determining coefficient Rn2 was higher. The order of soil scour resistance is Yang Ling clay loam, Yan'an sandy clay loam, to cohesive loam, Zhidan sandy loam, Jingbian sandy loam. The scour intensity of soil increases with the increase of slope. With the passage of scour time, the scour intensity gradually decreased, and the larger the slope, the greater the scour intensity in the earlier period. The erosion resistance coefficient of five kinds of soils showed a negative correlation with the sediment content of the flow, and the coefficient R2 was between 0.857 and 0.957 5, and the coefficient R2 was between 0. 0.857 and 0. 957 5, and the erosion resistance coefficient of the five soils showed a negative correlation with the sediment content. With the change of sediment content of water flow, the better the scouring resistance of soil is, the more obvious the change of erosion coefficient of soil itself is.
【作者单位】：西北农林科技大学资源环境学院;榆林市森林防火指挥部办公室;周至县水土保持工作站;
【基金】：国家自然科学基金项目(41101268,D010505) 西北农林科技大学科技创新项目(QN2011152)
【分类号】：S157.1

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