A model for the mean velocity of debris flow movement based on the minimum energy dissipation principle  

作　　者：LI Xiangning CHEN Jiangang CHEN Xiaoqing ZHAO Wanyu CHEN Huayong ZHANG Shaoxiong 

机构地区：[1]Key Laboratory of Mountain Hazards and Earth Surface Process,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences(CAS),Chengdu 610041,China [2]University of Chinese Academy Sciences,Beijing 100049,China [3]Shijiazhuang Tiedao University,Shijiazhuang 050043,China

出　　处：《Journal of Mountain Science》2024年第12期3961-3970,共10页山地科学学报（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.41925030);the Nyingchi National Sustainable Development Experimental Zone Project(2023-SYQ-007);the Chinese Academy of Sciences Light of West China Program;the Science and Technology Research Program of Institute of Mountain Hazards and Environment,Chinese Academy of Sciences(Grant No.IMHE-ZDRW-02).

摘　　要：The geomorphic minimum energy dissipation principle is important in the development of gully evolutionary theory.The impact of debris flows on channels during movement also adheres to this theory.A minimum energy dissipation model for debris flows has been obtained from previous studies,which is derived from the flow rules of runoff along a channel under rainfall or ice-snow meltwater conditions.However,the lack of consideration for erosion characteristics has hindered a comprehensive understanding of the movement characteristics of debris flow.In this paper,the phenomenon of volume increase resulting from the entrainment along debris flow movement is considered in order to derive a model for the mean velocity,reflecting the minimum energy dissipation principle.The entire expression of the mean velocity model is determined through 38 typical glacial and rainstorm debris flow cases.To evaluate the reliability of the proposed model,we employed 164 monitoring data from 1995 to 2000 in the Jiangjia gully,Yunnan,China.The results show that the velocity calculated by the proposed model are highly correlated with those obtained from the monitoring data.Additionally,a comparison is made between the mean velocities calculated by the proposed model and those obtained from previous studies,highlighting the exceptional applicability of the proposed model.This study will contribute to reveal the movement laws of debris flow along the channel.

关 键 词：Debris flow Minimum energy dissipation principle Longitudinal profile evolution Mean velocity 

分 类 号：P642.23[天文地球—工程地质学]