Effects of Rainfall Intensities and Slope Gradients on Runoff and Sediment Yield on Bare Iron Tailings Sand Slope

GUO Xingxing; LÜ Chunjuan; CHEN Dan; GUO Yansong; WANG Yu

doi:10.13870/j.cnki.stbcxb.2019.02.004

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Effects of Rainfall Intensities and Slope Gradients on Runoff and Sediment Yield on Bare Iron Tailings Sand Slope

更新时间：2025-03-12

- Effects of Rainfall Intensities and Slope Gradients on Runoff and Sediment Yield on Bare Iron Tailings Sand Slope
- Vol. 33, Issue 2, Pages: 23-29(2019)
- 作者机构：
  
  山西农业大学资源环境学院, 山西太谷,030801
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2019.02.004
  CLC：
- Published：2019
- 稿件说明：
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GUO Xingxing, LÜ Chunjuan, CHEN Dan, et al. Effects of Rainfall Intensities and Slope Gradients on Runoff and Sediment Yield on Bare Iron Tailings Sand Slope[J]. 2019, 33(2): 23-29.
DOI：

GUO Xingxing, LÜ Chunjuan, CHEN Dan, et al. Effects of Rainfall Intensities and Slope Gradients on Runoff and Sediment Yield on Bare Iron Tailings Sand Slope[J]. 2019, 33(2): 23-29. DOI： 10.13870/j.cnki.stbcxb.2019.02.004.

摘要

采用室内人工模拟降雨技术，研究短历时暴雨和坡度对裸露铁尾矿砂坡面产流产沙的影响。结果表明：（1）不同降雨强度条件下，不同坡度间的坡面径流量、产沙量及径流泥沙含量均呈现随着降雨历时的增加而增加的动态变化趋势，不同的是径流量在15~24 min后逐渐趋于稳定。（2）不同降雨强度条件下，裸露铁尾矿砂坡面径流量及产沙量与坡度相关关系均存在临界降雨强度，该临界降雨强度约为90 mm/h。（3）不同降雨强度条件下，不同坡度间的产沙量及径流泥沙含量随着降雨强度的增加，二者与坡度的关系均由负相关逐渐转变为正相关。（4）当降雨强度从60 mm/h增加到120 mm/h的过程中，不同坡度条件下的径流量及产沙量与降雨强度总体上呈逐渐上升的趋势，局部存在特殊情况。当坡度从25°增加到35°的过程中，不同降雨强度条件下的径流量及产沙量与坡度的关系均不明显；但同一坡度条件下，随着降雨强度的增加，径流量和产沙量均逐渐增加。研究成果为揭示降雨强度和坡度对裸露铁尾矿砂产流产沙机理提供参考。

Abstract

Effects of short-duration rainstorm and slope gradients on the runoff and sediment yield were studied in bare iron tailings slope using the indoor artificial rainfall simulation method. The results showed that:(1) Under different rainfall intensities

the runoff

sediment yield

and runoff sediment content of different slope gradients show a dynamic trend with the increase of rainfall duration. The difference was that the runoff gradually stabilizes after 15~24 minutes. (2) Under different rainfall intensities

the relationship between runoff

sediment yield

and slope gradients of bare iron tailings slope had a critical rainfall intensity

and the range of this critical rainfall intensity was about 90 mm/h

and the range value of specific critical rainfall intensity needed further studies and determination. (3) Under different rainfall intensities

the sediment yield and runoff sediment content between different slope gradients increased with the rainfall intensity

and the relationship between them and slope gradually changed from negative correlation to positive correlation. (4) When the rainfall intensity increased from 60 mm/h to 120 mm/h

the runoff and sediment yield with rainfall intensity under different slope conditions showed a generally gradual upward trend

and there were local special cases. When the slope increased from 25° to 35°

the relationship between runoff and sediment yield under different rainfall intensities was not obvious; but under the same slope gradient condition

the runoff and sediment yield basically increased with the increase of rainfall intensity. The research results provide reference for the study on the mechanism of rainfall intensity and slope on the abortion sand production of bare iron tailings.

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