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洪水侵蚀沟床形成泥石流的临界水力条件研究
Alternative TitleStudy on the critical hydraulic condition of debris flow in scoured channel
王涛1,2; 陈宁生1,2; 邓明枫1,2; 李俊1,2,3
Corresponding Author王涛
2018
Source Publication泥沙研究
ISSN0468-155X
Volume43Issue:1Pages:38-43
Abstract洪水侵蚀沟床形成泥石流是泥石流的主要类型之一,研究其形成机理和形成的临界条件有助于泥石流治理和预警预报。借鉴河流动力学中推移质输沙理论,对已有洪水侵蚀沟床形成泥石流的水槽试验资料分析表明,洪水侵蚀沟床所形成泥石流的体积输沙浓度随沟床固体颗粒物质无量纲切应力的增大而增大,且呈幂函数关系。采用定量标准作为泥石流形成判别条件,则泥石流形成临界条件是体积输沙浓度计算公式的一个特例,此时床面颗粒无量纲切应力为0.655,远大于泥沙颗粒起动无量纲切应力。基于10组水槽试验资料和1组蒋家沟原型观测资料的适用性分析表明,建立的体积输沙浓度计算公式是合理的,能够反映泥石流形成和输移规律,可用于指导泥石流形成临界水力条件的计算。
Other Abstract

洪水侵蚀沟床形成泥石流是泥石流的主要类型之一,研究其形成机理和形成的临界条件有助于泥石流治理和预警预报。借鉴河流动力学中推移质输沙理论,对已有洪水侵蚀沟床形成泥石流的水槽试验资料分析表明,洪水侵蚀沟床所形成泥石流的体积输沙浓度随沟床固体颗粒物质无量纲切应力的增大而增大,且呈幂函数关系。采用定量标准作为泥石流形成判别条件,则泥石流形成临界条件是体积输沙浓度计算公式的一个特例,此时床面颗粒无量纲切应力为0.655,远大于泥沙颗粒起动无量纲切应力。基于10组水槽试验资料和1组蒋家沟原型观测资料的适用性分析表明,建立的体积输沙浓度计算公式是合理的,能够反映泥石流形成和输移规律,可用于指导泥石流形成临界水力条件的计算。 

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Debris flow due to channel-bed failure is one of main types of debris flow. Study on critical condition for initiation of debris flow is very important for prevention and early-warning of debris flows. Analysis based on bed load transport theory and debris flow experimental results shows that solid transportation concentration increases with the increase of dimensionless bed shear stress with a power function between solid transportation concentration and dimensionless bed shear stress. Quantitative standard is adopted to describe the initiation of debris flow. Quantitative standard is adopted to describe the initiation of debris flow in this paper, and the critical condition for initiation of debris flow due to channel-bed failure is a special case of the formula
which is established to predict the solid transportation concentration. Results show that imitation of debris flow requires heightened dimensionless bed shear stress. Analysis of performance and applicability based on 10 sets of flume experiment data and 1 set of field data in Jiangjia Gully indicates that the model in this paper can be
used to estimate the critical condition for initiation of debris flow.

Keyword泥石流形成 临界水利条件 体积输沙浓度 无量纲切应力
Subject AreaP642.23
DOI10.16239/j.cnki.0468-155X.018.01.007
Indexed ByCSCD ; 北大中文核心
Language中文
CSCD IDCSCD:6175400
Funding Organization国家自然科学基金项目( 51409243、41661134012)
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/20905
Collection山地灾害与地表过程重点实验室
Affiliation1.中国科学院山地灾害与地表过程重点实验室
2.中国科学院-水利部成都山地灾害与环境研究所
3.中国科学院大学
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
王涛,陈宁生,邓明枫,等. 洪水侵蚀沟床形成泥石流的临界水力条件研究[J]. 泥沙研究,2018,43(1):38-43.
APA 王涛,陈宁生,邓明枫,&李俊.(2018).洪水侵蚀沟床形成泥石流的临界水力条件研究.泥沙研究,43(1),38-43.
MLA 王涛,et al."洪水侵蚀沟床形成泥石流的临界水力条件研究".泥沙研究 43.1(2018):38-43.
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