陕北风沙区含砾石工程堆积体坡面产流产沙试验

发布时间：2018-03-27 23:27

本文选题：风沙土　切入点：工程堆积体　出处：《水科学进展》2016年02期

【摘要】：采用室内人工模拟降雨方法,研究了陕北风沙区含砾石工程堆积体边坡的产流产沙过程。结果表明:1砾石存在改变了坡面入渗速率,径流系数受入渗速率的影响,随砾石含量的增加先线性递减后线性递增,并在10%砾石含量处存在阈值;径流系数随降雨强度的增加线性递增。2含砾石堆积体坡面流速较纯土堆积体降低,且随雨强增大,砾石延缓径流流动的作用越显著;雨强对径流流速的影响随砾石含量增加持续减弱。3土壤剥蚀率在产流24~33 min后显著增加,砾石主要对显著增加后的平均剥蚀率产生影响。4雨强1.0 mm/min时,砾石存在促进降雨侵蚀,产沙量增大;雨强大于1.0 mm/min时,砾石具有显著的减沙效应。
[Abstract]:By using indoor artificial rainfall, runoff and sediment process of sandy area in Northern Shaanxi gravel slope engineering. The results showed that 1 gravel changed the soil infiltration rate, runoff coefficient is affected by the infiltration rate, decreasing with the increase of gravel content after the first linear linear increasing, and there is a threshold in 10% gravel content; runoff coefficient with the rainfall intensity increase linearly increased.2 gravel stone debris on the velocity than the pure mound integrated decreased, and with increased rainfall intensity, runoff flow gravel delay the more significant the effect of rainfall intensity on runoff velocity; the influence of.3 continued to weaken the soil erosion rate increased significantly in the runoff of 24~33 min with the increase of the content of gravel, the average denudation increased significantly after the main effect.4 gravel gravel rain intensity 1 mm/min, promoting rainfall erosion, the sediment yield increased; rainfall intensity is greater than 1 mm/min, with gravel The effect of sand reduction.

【作者单位】：西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室;中国科学院水利部水土保持研究所;西北农林科技大学资源环境学院;长江科学院水土保持研究所;榆林学院生命科学学院;山东省水利科学研究院水土保持与生态研究所;南京水利科学研究院;
【基金】：国家自然科学基金资助项目(40771127) 水利部公益性行业科研专项经费资助项目(201201048)~~
【分类号】：S157.1

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