坡面覆沙后侵蚀泥沙颗粒分选特性

侵蚀泥沙颗粒大小的分布在一定程度上影响着侵蚀泥沙的搬运和沉积,了解侵蚀泥沙的分选作用将有助于解释泥沙的侵蚀和沉积过程。该文以覆沙坡面为研究对象,采用室内模拟降雨的方法,选取坡度12°、雨强1.5 mm/min的黄土坡面上分别覆盖0.5、1.0、1.5 cm的沙层进行试验。结果表明：坡面覆沙后,坡面粗颗粒物质大部分在产流开始0-10 min内便被冲刷带走;侵蚀泥沙颗粒主要以粉粒为主;坡面覆沙后,在细沟间侵蚀阶段,径流优先搬运大于0.054 mm的颗粒,在细沟侵蚀阶段和细沟侵蚀及细沟间侵蚀的组合阶段,径流搬运的泥沙颗粒以小于0.054 mm的颗粒为主;同时,在产流前期（0-10 min）侵蚀泥沙颗...

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Published in农业工程学报 Vol. 33; no. 2; pp. 125 - 130
Main Author 汤珊珊 高海东 李占斌 任宗萍 张辉 苏远逸 支再兴
Format Journal Article
LanguageChinese
Published 西安理工大学西北水资源与环境生态教育部重点实验室,西安,710048%西安理工大学西北水资源与环境生态教育部重点实验室，西安 710048 2017
中国科学院水利部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，杨凌 712100
Subjects
侵蚀
覆沙坡面
降雨
颗粒分选
颗粒大小
侵蚀
particle size
rain
覆沙坡面
sand-covered slope
颗粒分选
sediment sorting
颗粒大小
erosion
降雨
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ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2017.02.017

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Summary:侵蚀泥沙颗粒大小的分布在一定程度上影响着侵蚀泥沙的搬运和沉积,了解侵蚀泥沙的分选作用将有助于解释泥沙的侵蚀和沉积过程。该文以覆沙坡面为研究对象,采用室内模拟降雨的方法,选取坡度12°、雨强1.5 mm/min的黄土坡面上分别覆盖0.5、1.0、1.5 cm的沙层进行试验。结果表明：坡面覆沙后,坡面粗颗粒物质大部分在产流开始0-10 min内便被冲刷带走;侵蚀泥沙颗粒主要以粉粒为主;坡面覆沙后,在细沟间侵蚀阶段,径流优先搬运大于0.054 mm的颗粒,在细沟侵蚀阶段和细沟侵蚀及细沟间侵蚀的组合阶段,径流搬运的泥沙颗粒以小于0.054 mm的颗粒为主;同时,在产流前期（0-10 min）侵蚀泥沙颗粒主要以大于0.054 mm的颗粒为主;而在产流后期（10 min以后）侵蚀泥沙则主要以小于0.054 mm的颗粒为主。坡面覆沙后,黏粒以团聚体的形式存在,粉粒以单粒的形式存在,而沙粒以细颗粒聚集体的形式存在。该文为进一步研究泥沙沉积后风蚀对水蚀的影响提供数据支撑。
Bibliography:Tang Shanshan1, Gao Haidong1, Li Zhanbin1,2, Ren Zongping1, Zhang Hui1, Su Yuanyi1, Zhi Zaixing1 （1. Key Laboratory of Northwest Water Resources and Environment Ecology of MOE, Xi ＂an University of Technology, Xi＂ an 710048, China; 2. State Key Laboratory of Soil Erosion and Dry-land Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China）
11-2047/S
Sediment size distribution greatly affects sediment transport and deposition. A better understanding of sediment sorting will improve the understanding of erosion and sedimentation processes, which in turn will improve erosion modeling. In this paper, using artificially simulated rainfall experiment, the sieved sand slope erosion and sediment grain size distribution and the change process were analyzed under the condition of 1.5 mm/min rainfall intensity, and the sieved sand slope erosion and sediment particle characteristics were explored, which aimed to further clar
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2017.02.017