Experimental Study on the Drop Pit Development of Rill Erosion on Soil-rock Mixed Colluvial Deposit Slopes

JIANG Fangshi; ZHANG Haidong; CHEN Peisong; LIN Jiahui; LIN Jinshi; SHI Yuezhong; XU Yongming; HUANG Yanhe

doi:10.13870/j.cnki.stbcxb.2019.06.004

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Experimental Study on the Drop Pit Development of Rill Erosion on Soil-rock Mixed Colluvial Deposit Slopes

更新时间：2025-03-12

- Experimental Study on the Drop Pit Development of Rill Erosion on Soil-rock Mixed Colluvial Deposit Slopes
- Vol. 33, Issue 6, Pages: 27-33(2019)
- 作者机构：
  
  1. 福建农林大学资源与环境学院,福州,350002
  2. 安溪县水土保持委员会办公室, 福建安溪,362000
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2019.06.004
  CLC：
- Published：2019
- 稿件说明：
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JIANG Fangshi, ZHANG Haidong, CHEN Peisong, et al. Experimental Study on the Drop Pit Development of Rill Erosion on Soil-rock Mixed Colluvial Deposit Slopes[J]. 2019, 33(6): 27-33.
DOI：

JIANG Fangshi, ZHANG Haidong, CHEN Peisong, et al. Experimental Study on the Drop Pit Development of Rill Erosion on Soil-rock Mixed Colluvial Deposit Slopes[J]. 2019, 33(6): 27-33. DOI： 10.13870/j.cnki.stbcxb.2019.06.004.

摘要

为了探究土石混合崩积体坡面细沟跌坑发育情况，采用室内放水冲刷试验，通过设置4个流量（2，4，8，12 L/min）和4种砾石含量的土石混合崩积物（砾石质量比例0，10%，30%，50%），研究不同条件下细沟跌坑的发育特征。结果表明：在不同冲刷时段，跌坑数量变化为3~17个，跌坑平均深度为1.10~5.93 cm，细沟纵断面形态系数为2.97~19.97。各跌坑参数随冲刷时间的延长总体呈增大趋势，部分坡面在5 min或7.5 min时出现最大值；跌坑参数随流量的增加总体呈先增大后减小趋势，8 L/min流量条件下出现最大值，而随着砾石含量增加总体呈增大趋势；流量对跌坑发育的影响大于砾石含量。各跌坑参数与流速、阻力系数及曼宁粗度系数密切相关，径流剪切力是描述跌坑发育的最适合水动力学指标，可用线性函数表达。

Abstract

In order to explore the drop pit development on soil-rock mixed colluvial deposit slopes

a scouring test was conducted in laboratory. Four soil-rock mixed colluviums (0

10%

30%

50% gravel in mass ratio) under different flow discharges (2

12 L/min) were tested.The results were as followed:the number of drop pit varied from 3 to 17

the average depth of drop pit was between 1.10 to 5.93 cm

and the profile form indices were between 2.97 and 19.97. The number of drop pit

the depth of drop pit

and the profile form indices all showed the increasing trend overall with the increase of scouring duration

whereas the maximum value appeared in some slopes at 5 min or 7.5 min. All drop pit parameters first increased and then decreased with the increase of flow discharge as a whole

and the maximum value appeared under the discharge of 8 L/min. The number of drop pit

the depth of drop pit

and the profile form indices increased with the increase of gravel content.The influence of flow discharge on the all parameters of drop pit was greater than those of gravel contents. Drop pit parameters were significantly correlated with flow velocity

resistance coefficient and Manning roughness coefficient. Shear stress was the best hydrodynamic parameter to describe the development of drop pit development as a linear function.

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