Study on Critical Hydraulic Characteristic of Soil Detachment and Soil Shear Strength under Different Antecedent Soil Moisture Contents

WANG Chenfeng1; ZHANG Shouhong1; WANG Bin1; 2

doi:10.13870/j.cnki.stbcxb.2017.01.016

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Study on Critical Hydraulic Characteristic of Soil Detachment and Soil Shear Strength under Different Antecedent Soil Moisture Contents

更新时间：2025-03-12

- Study on Critical Hydraulic Characteristic of Soil Detachment and Soil Shear Strength under Different Antecedent Soil Moisture Contents
- Vol. 31, Issue 1, Pages: 91-96(2017)
- 作者机构：
  
  1. 北京林业大学水土保持学院,北京,100083
  2. 北京林业大学重庆缙云山三峡库区森林生态系统国家定位观测研究站,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2017.01.016
  CLC： S157.1
- Published：2017
- 稿件说明：
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WANG Chenfeng1, ZHANG Shouhong1, WANG Bin1, et al. Study on Critical Hydraulic Characteristic of Soil Detachment and Soil Shear Strength under Different Antecedent Soil Moisture Contents[J]. 2017, 31(1): 91-96.
DOI：

WANG Chenfeng1, ZHANG Shouhong1, WANG Bin1, et al. Study on Critical Hydraulic Characteristic of Soil Detachment and Soil Shear Strength under Different Antecedent Soil Moisture Contents[J]. 2017, 31(1): 91-96. DOI： 10.13870/j.cnki.stbcxb.2017.01.016.

摘要

坡面土壤分离临界水动力参数的定量描述对完善土壤侵蚀物理模型具有重要意义。通过实测不同土壤前期含水量（5%～23%）和坡度（1°～10°）条件下黄壤坡面土壤分离临界水动力参数，并结合不同土壤含水量（3%～23%）对土壤抗剪强度的影响，综合分析及探讨不同土壤前期含水量、坡度和土壤抗剪强度与临界水动力特性的关系。结果表明：临界流量与不同土壤前期含水量和坡度呈幂函数减小关系，提出一种能够体现土壤前期含水量和坡度共同作用对临界水动力参数影响的预测方程。在坡度小于5°时，土壤前期含水量对临界水动力学参数影响较小，可直接采用简化的幂函数关系进行计算。土壤粘聚力随土壤含水量的增加先出现峰值后逐渐减小至稳定；与土壤粘聚力的变化趋势不同，土壤分离临界水动力参数则逐渐减小。

Abstract

A precisely quantitative description of critical hydrodynamic characteristics of soil detachments was a important for developing physically based soil erosion model. In this study

the critical hydrodynamic characteristics of soil detachment on yellow soil slope were measured under different antecedent soil moisture contents（5%～23%）and slope gradients (1°～10°)

the impacts of soil moisture content (3%～23%) on shear strength were also investigated. The study comprehensively analyzed the effects of different antecedent soil moisture contents

slope gradients and soil shear strengths on critical hydrodynamic characteristics. And the results showed that critical flow rate had power function relationship with slope gradient and antecedent soil moisture content. In this paper

an accurate equation was proposed

which reflected combined effect between the antecedent soil moisture content and slope gradient on critical hydraulic characteristics. A simplified power function could be used when the slope gradient was smaller than 5°. This equation could ignore the impact of the antecedent soil moisture content. Soil cohesion reached peak firstly and then fell down to stable with the increase of the antecedent soil moisture content. While the critical hydrodynamic characteristics of soil detachment showed a gradually decreasing trend.

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