砾石覆盖条件下盐碱土边坡降雨侵蚀水动力学特征

陈心逸; 李

doi:10.13870/j.cnki.stbcxb.2018.01.019

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砾石覆盖条件下盐碱土边坡降雨侵蚀水动力学特征

更新时间：2025-03-12

- 砾石覆盖条件下盐碱土边坡降雨侵蚀水动力学特征
- Hydrodynamic Characteristics of Rainfall Runoff on Saline-alkali Slope Covered by Gravel
- 水土保持学报 2018年32卷第1期页码：116-120
- 作者机构：
  
  1. 河海大学南方地区高效灌排与农业水土环境教育部重点实验室,南京,210098
  2. 河海大学水利水电学院,南京,210098
  3. 南京江地土地开发咨询服务有限责任公司,南京,210024
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2018.01.019
  中图分类号： S152.7
- 纸质出版：2018
- 稿件说明：
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陈心逸, 李. 砾石覆盖条件下盐碱土边坡降雨侵蚀水动力学特征[J]. 水土保持学报, 2018,32(1):116-120.

CHEN Xinyi1, 2, LI Li3. Hydrodynamic Characteristics of Rainfall Runoff on Saline-alkali Slope Covered by Gravel[J]. 2018, 32(1): 116-120.
陈心逸, 李. 砾石覆盖条件下盐碱土边坡降雨侵蚀水动力学特征[J]. 水土保持学报, 2018,32(1):116-120. DOI： 10.13870/j.cnki.stbcxb.2018.01.019.

CHEN Xinyi1, 2, LI Li3. Hydrodynamic Characteristics of Rainfall Runoff on Saline-alkali Slope Covered by Gravel[J]. 2018, 32(1): 116-120. DOI： 10.13870/j.cnki.stbcxb.2018.01.019.

摘要

为了探究砾石覆盖对盐碱土坡面侵蚀的减沙效应，通过室内模拟降雨试验，研究不同坡度和雨强条件下降雨径流水动力学特征及产沙受砾石覆盖的影响。试验坡度选取15°和30°，雨强选取92，119 mm/h，坡面砾石覆盖度分别为0，10%，20%，40%，60%，80%，采用染色示踪法测定坡面径流流速。结果表明：不同坡度和雨强条件下，水流产沙率随坡面砾石覆盖度增大先增后减；雷诺数与弗劳德数均随砾石覆盖度增大呈先增后减的抛物线趋势，曼宁糙率、Dracy-Weisbach阻力系数、坡面径流剪切力和径流功率均与坡面砾石覆盖度线性正相关；径流功率预测产沙率效果较好，二者呈对数关系（R2=0.47）。

Abstract

A series of simulated rainfall experiments were conducted to investigate the reducing effect of gravel cover on erosion of saline slope. The effects of gravel coverage on hydrodynamic characteristics of runoff and unit sediment load were analyzed under different slope gradients (15°and 30°) and rainfall intensities (92 and 119 mm/h). The cover rates of gravel were 0

10%

20%

40%

60% and 80%

respectively. The flow rate was measured by dyeing tracer method. Unit sediment load increased first and decreased then with the increasing of gravel coverage under different slopes and rain intensities. The changing tendency of Reynolds number and Froude number versus gravel coverage was determined by parabola curve. Manning roughness

Dracy-Weisbach resistance coefficient

the stream average shear force and the stream power had positive liner relationship with the gravel coverage. The stream power predicted sediment load rate well

and these two were logarithmic (R2=0.47).

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