Experimental Study on Scouring Rate of Debris Flow Solid Matter Under Runoff

An Xiao; Pan Huali; Deng Qijuan; Ou Guoqiang; Li Bingzhi; Kong Ling

doi:10.13961/j.cnki.stbctb.2020.06.014

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Experimental Study on Scouring Rate of Debris Flow Solid Matter Under Runoff

- Experimental Study on Scouring Rate of Debris Flow Solid Matter Under Runoff
- Bulletin of Soiland Water Conservation Vol. 40, Issue 6, Pages: 94-100(2020)
- 作者机构：
  
  1. 中国科学院山地灾害与地表过程重点实验室,四川,成都,610041
  2. 中国科学院水利部成都山地灾害与环境研究所,四川,成都,610041
  3. 中国科学院大学,北京,100049
  4. 四川建筑职业技术学院,四川,成都,610081
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2020.06.014
  CLC： TV144
- Published：2020
- 稿件说明：
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An Xiao, Pan Huali, Deng Qijuan, et al. Experimental Study on Scouring Rate of Debris Flow Solid Matter Under Runoff[J]. Bulletin of Soiland Water Conservation, 2020, 40(6): 94-100.
DOI：

An Xiao, Pan Huali, Deng Qijuan, et al. Experimental Study on Scouring Rate of Debris Flow Solid Matter Under Runoff[J]. Bulletin of Soiland Water Conservation, 2020, 40(6): 94-100. DOI： 10.13961/j.cnki.stbctb.2020.06.014.

摘要

[目的] 探讨泥石流固体物质的冲刷深度随时间的变化规律，以及对应的冲刷速率与不同影响因素之间存在的关系，为泥石流规模预测及防治工程设计提供参考依据。[方法] 根据激光测距仪的历时测距原理，借助试验方法分析泥石流固体物质冲刷深度随时间的变化规律以及对应的冲刷速率与不同影响因素之间的关系，包括来流流量、水力半径、沟床纵坡以及细粒物质含量等。[结果] 冲刷速率与水力半径间呈指数关系，与来流流量间呈正相关关系，与能坡梯度间呈指数关系；若固体物质为均匀冲刷，冲刷速率与剩余切应力成线性正相关关系；对于初始含水率相对较低的固体物质，冲刷速率随着细粒物质含量的增大呈微小增大趋势。[结论] 在薄层径流条件下，能坡梯度对冲刷速率的影响高于水力半径。

Abstract

[Objective] The variation of the erosion depth of debris flow solid mater

and the relationship between the corresponding scouring rate and different influencing factors were explored in order to provide reference for debris flow prediction and prevention engineering design.[Methods] According to the principle of the laser rangefinder

the variation of the erosion depth of debris flow solid matter over time and the relationship between the corresponding erosion rate and different influencing factors were explored

including the incoming flow

hydraulic radius

and gully bed longitudinal slope and the content of fine particles.[Results] The scour rate showed an exponential relationship with the hydraulic radius

a positive correlation with the incoming flow

and an exponential relationship with the energy slope gradient. If the solid matter was uniformly scoured

the scouring rate had a linear positive correlation with residual shear force. For the solid matter with a relatively low initial moisture content

the scouring rate increased slightly with the increase of the content of fine particles.[Conclusion] Under the condition of thin runoff

the energy slope gradient had a greater influence on the erosion rate

compared to the hydraulic radius.

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references

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