Experiment Study of Sheet and Rill Flow Hydraulic Characteristics and the Critical Conditions on Saturated Purple Soil Slopes in Chongqing

TAN Wenhao; CHEN Xiaoyan; TAO Tingting; LI Dandan; MA Liwen; KONG Lingyong

doi:10.13870/j.cnki.stbcxb.2023.03.009

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Experiment Study of Sheet and Rill Flow Hydraulic Characteristics and the Critical Conditions on Saturated Purple Soil Slopes in Chongqing

更新时间：2025-03-12

- Experiment Study of Sheet and Rill Flow Hydraulic Characteristics and the Critical Conditions on Saturated Purple Soil Slopes in Chongqing
- Vol. 37, Issue 3, Pages: 66-72(2023)
- 作者机构：
  
  西南大学资源环境学院,重庆,400716
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2023.03.009
  CLC： S157.1
- Published：2023
- 稿件说明：
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TAN Wenhao, CHEN Xiaoyan, TAO Tingting, et al. Experiment Study of Sheet and Rill Flow Hydraulic Characteristics and the Critical Conditions on Saturated Purple Soil Slopes in Chongqing[J]. 2023, 37(3): 66-72.
DOI：

TAN Wenhao, CHEN Xiaoyan, TAO Tingting, et al. Experiment Study of Sheet and Rill Flow Hydraulic Characteristics and the Critical Conditions on Saturated Purple Soil Slopes in Chongqing[J]. 2023, 37(3): 66-72. DOI： 10.13870/j.cnki.stbcxb.2023.03.009.

摘要

为比较饱和紫色土坡面片流与细沟流水力学特征并明确其临界水力学特性

进行5个坡度(2°

5°

10°

15°

20°)和3个雨强(30

90 mm/h)组合条件下的室内人工模拟降雨试验

在测得坡面片流、细沟流及其转变的临界流速的基础上

计算得到片流、细沟流及其转变的临界水力学参数

包括水深、雷诺数、弗劳德数和达西阻力系数。结果表明:在不同侵蚀阶段

片流流速为0.064~0.151 m/s

细沟流流速为0.175~0.350 m/s

雨强和坡度在不同侵蚀阶段对流速和水深的影响程度存在差异。片流均为层流

＜10°坡时

片流为缓流

片流多居缓层流流态;中、大雨强条件下

细沟流均为过渡流

＞5°坡时细沟流均为急流

细沟流多为急过渡流流态。片流达西阻力系数与坡度和雨强呈负相关关系

细沟流达西阻力系数与坡度和雨强呈正相关关系。坡面径流由片流转为细沟流的临界流速为0.100~0.165 m/s。流速改变坡面形态

导致细沟侵蚀发生的临界水流流态和水流阻力随坡度和雨强变化的规律不同。研究结果对于认识饱和土壤条件下坡面不同侵蚀阶段径流水力学特性

进一步明确由片流转为细沟流的临界水力条件具有一定参考价值。

Abstract

In order to compare the hydraulic characteristics of sheet flow and rill flow on saturated purple soil slope and clarify their critical hydraulic characteristics

indoor artificial simulated rainfall experiments were conducted under the combined conditions of five slope gradients (SGs: 2°

5°

10°

15°

20°) and three rainfall intensities (RIs: 30

90 mm/h). On the basis of measuring the velocity of sheet flow

rill flow and critical velocity of shee flow transform to rill flow

the corresponding hydraulic parameters were calculated

including water depth

Reynolds number

Froude number and Darcy resistance coefficient. The results showed that: In different erosion stages

the velocity of sheet flow was between 0.064 and 0.151 m/s and rill flow was between 0.175 and 0.350 m/s. The influence degree of SGs and RIs on velocity and water depth of sheet and rill flow was different. The sheet flow was all laminar and was tranquil when the slope gradient was < 10°. The sheet flow was mostly in the state of tranquil laminar flow. The rill flow was transitional under the conditions of moderate and heavy rain and was rapid when the slope gradient was > 5°. The rill flow was mostly in the state of rapid transitional flow. The Darcy resistance coefficient of sheet flow was negatively correlated with SGs and RIs

while that of rill flow was positively. The critical velocity of sheet flow transform to rill flow was between 0.100 and 0.165 m/s. The velocity would change the slope shape

resulting in the difference of the critical flow pattern and flow resistance with SGs and RIs. This study is of great significance to understand the hydraulic characteristics of sheet flow and rill flow on saturated soil slope

and to further clarify the critical hydraulic conditions for the sheet flow to rill flow transition.

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