Study on Variation Characteristics of Eroded Sediment in Purple Soil Steep Slope Land Based on Simulated Rainfall

GAO Min; NIU Qing-xia; WANG Ru; CHEN Xiao-yan; WEI Chao-fu

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Study on Variation Characteristics of Eroded Sediment in Purple Soil Steep Slope Land Based on Simulated Rainfall

更新时间：2024-11-07

- Study on Variation Characteristics of Eroded Sediment in Purple Soil Steep Slope Land Based on Simulated Rainfall
- Vol. 25, Issue 2, (2011)
- 作者机构：
  
  西南大学,资源环境学院/西南大学三峡库区生态环境教育部重点实验室,重庆,北碚,400716
- 作者简介：
- 基金信息：
- DOI：
  CLC： S157.1
- Published：2011
- 稿件说明：
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GAO Min, NIU Qing-xia, WANG Ru, et al. Study on Variation Characteristics of Eroded Sediment in Purple Soil Steep Slope Land Based on Simulated Rainfall[J]. 2011, 25(2).
DOI：

GAO Min, NIU Qing-xia, WANG Ru, et al. Study on Variation Characteristics of Eroded Sediment in Purple Soil Steep Slope Land Based on Simulated Rainfall[J]. 2011, 25(2). DOI：

摘要

基于人工模拟降雨研究了三峡库区25°径流小区侵蚀泥沙对0.285

0.978

1.737 mm/min 3种不同降雨强度的响应特征。结果表明:在降雨过程中径流泥沙量

随产流历时的增加呈现先增加后逐渐减少

最终趋于稳定。侵蚀泥沙峰值量出现的时间随着雨强的增大在整个产流历程中不断提前。坡面径流的累积产沙量随产流历时的增加呈幂函数规律

相同降雨历时大降雨强度的累积产沙量明显高于小降雨强度的累积产沙量。在降雨强度为0.285

0.978

1.737 mm/min时

侵蚀泥沙中大颗粒的砂粒含量随产流历时的增加大致呈现降低趋势

侵蚀泥沙中细颗粒的粘粒及粉粒含量随着产流历时的增加呈现增加的趋势

但不同降雨强度下侵蚀泥沙机械组成的波动性有显著差异

雨强越大

侵蚀泥沙机械组成与产流历时回归模型拟合越好。

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