Soil Erosion Characteristics of Engineering Deposits Under Continuous Runoff Scouring

Zhao Chun; Gao Zhaoliang; Li Yonghong; Sun Guanfang; Lou Yongcai; Yang Shuyun; Wu Tong

doi:10.13961/j.cnki.stbctb.2022.06.008

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Soil Erosion Characteristics of Engineering Deposits Under Continuous Runoff Scouring

- Soil Erosion Characteristics of Engineering Deposits Under Continuous Runoff Scouring
- Bulletin of Soiland Water Conservation Vol. 42, Issue 6, Pages: 61-67(2022)
- 作者机构：
  
  1. 西北农林科技大学水土保持研究所, 陕西杨凌,712100
  2. 中国科学院水利部水土保持研究所, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2022.06.008
  CLC： S157.1
- Published：2022
- 稿件说明：
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Zhao Chun, Gao Zhaoliang, Li Yonghong, et al. Soil Erosion Characteristics of Engineering Deposits Under Continuous Runoff Scouring[J]. Bulletin of Soiland Water Conservation, 2022, 42(6): 61-67.
DOI：

Zhao Chun, Gao Zhaoliang, Li Yonghong, et al. Soil Erosion Characteristics of Engineering Deposits Under Continuous Runoff Scouring[J]. Bulletin of Soiland Water Conservation, 2022, 42(6): 61-67. DOI： 10.13961/j.cnki.stbctb.2022.06.008.

摘要

[目的] 探究连续径流冲刷条件下工程堆积体的坡面侵蚀响应，为进一步认识工程堆积体在连续冲刷过程中的侵蚀规律并为水土流失模型精准预测提供基础数据和科学参考。[方法] 设置3个放水梯度(8，12，16 L/min)，在3个坡度(28，32，36°)条件下，进行野外连续3场径流冲刷试验(每场间隔24 h)。[结果] ①各场次产流特征为：第3场＞第2场＞第1场，其中，第3场径流量增量大于第2场，对比第1场增速分别为40.5%和33.4%。②各场次产沙量为:第1场＞第2场＞第3场，产沙量占比分别为31.74%～53.46%，29.03%～43.71%，17.42%～29.04%。③在任意流量段，连续径流冲刷下平均流速与沟宽的变化无关，沿径流方向流速与沟深变化一致。[结论] 上方来水条件下工程堆积体坡面产流随冲刷场次的增加逐场增大，产沙随场次增加逐场减少。冲刷场次对平均产流率具有显著影响。

Abstract

[Objective] The slope erosion response of engineering deposits occurring under continuous runoff scouring was determined in order to further understand the laws governing erosion of engineering deposits during continuous scouring

and to provide basic data as a reference for accurate predictions by soil erosion models. [Methods] We set up three drainage gradients (8

16 L/min) on three slopes (28

36°) and carried out three consecutive envent runoff scouring tests (24 h between each envent). [Results] ① The runoff characteristics of each envent followed the order of envent 3 > envent 2 > envent 1

and the increase in runoff in envent 3 was greater than in envent 2. The growth rates in envent 1 were 40.5% and 33.4%

respectively. ② The sediment yield followed the order of envent 1 > envent 2 > envent 3

and the proportion of sand production was 31.74%~53.46%

29.03%~43.71%

and 17.42%~29.04%

respectively. ③ In any flow section

the average flow velocity under continuous runoff erosion had nothing to do with the change of the channel width

and the flow velocity along the runoff direction was consistent with the change of the channel depth. [Conclusion] As water flows from above

runoff on the slope surface of engineering deposits increases with increasing scouring time

and sediment yield decreases with increasing time and the scouring site has a significant impact on the average runoff rate.

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references

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