| 坡面覆沙后侵蚀泥沙颗粒分选特性 |
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| 引用本文： | 汤珊珊,高海东,李占斌,任宗萍,张辉,苏远逸,支再兴.坡面覆沙后侵蚀泥沙颗粒分选特性[J].农业工程学报,2017,33(2):125-130. |
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| 作者姓名： | 汤珊珊 高海东 李占斌 任宗萍 张辉 苏远逸 支再兴 |
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| 作者单位： | 1. 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;2. 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; 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 |
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| 基金项目： | 国家自然科学基金青年项目(41401305); 国家自然科学基金重点项目（41330858）;西安理工大学博士创新基金（310-252071505） |
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| 摘 要： | 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。
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| 关 键 词： | 侵蚀 颗粒大小 降雨 覆沙坡面 颗粒分选 |
| 收稿时间： | 2016/5/5 0:00:00 |
| 修稿时间： | 2016/11/18 0:00:00 |
Characteristics of particle separation of erosion sediment in slop surface covered with sand |
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| Tang Shanshan,Gao Haidong,Li Zhanbin,Ren Zongping,Zhang Hui,Su Yuanyi and Zhi Zaixing.Characteristics of particle separation of erosion sediment in slop surface covered with sand[J].Transactions of the Chinese Society of Agricultural Engineering,2017,33(2):125-130. |
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| Authors: | Tang Shanshan Gao Haidong Li Zhanbin Ren Zongping Zhang Hui Su Yuanyi and Zhi Zaixing |
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| Institution: | 1. Key Laboratory of Northwest Water Resources and Environment Ecology of MOE;,1. Key Laboratory of Northwest Water Resources and Environment Ecology of MOE;,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,1. Key Laboratory of Northwest Water Resources and Environment Ecology of MOE;,1. Key Laboratory of Northwest Water Resources and Environment Ecology of MOE;,1. Key Laboratory of Northwest Water Resources and Environment Ecology of MOE; and 1. Key Laboratory of Northwest Water Resources and Environment Ecology of MOE; |
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| Abstract: | Abstract: 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 clarify the sieved sand slope erosion and sediment yield process. This paper studied the characteristics of sediment particles under different sand thickness, and there were 3 treatments, i.e. ST1 (sand thickness of 0.5 cm), ST2 (sand thickness of 1.0 cm), and ST3 (sand thickness of 1.5 cm). Malvern 2 000 laser particle size analyzer was used to measure the sediment particle composition, which was expressed by the mean weighted diameter (MWD). The results showed that most of coarse particulate matter was washed away within 0-10 min after the runoff production began; the sediment particle content of less than 0.054 mm was ST2
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| Keywords: | erosion particle size rain sand-covered slope sediment sorting |
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