Modelling the temporal-varied nonlinear velocity profile of debris flow using a stratification aggregation algorithm in 3D-HBP-SPH framework  

作　　者：HAN Zheng XIE Wendu ZENG Chuicheng LI Yange CHEN Guangqi CHEN Ningsheng HU Guisheng WANG Weidong 

机构地区：[1]School of Civil Engineering,Central South University,Changsha 410075,China [2]Hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structures,Changsha 410075,China [3]The Key Laboratory of Engineering Structures of Heavy Haul Railway,Ministry of Education,Changsha 410075,China [4]Department of Civil Engineering,Kyushu University,Fukuoka 819-0395,Japan [5]Key Lab of Mountain Hazards and Surface Processes,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China

出　　处：《Journal of Mountain Science》2024年第12期3945-3960,共16页山地科学学报（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52078493);the Natural Science Foundation of Hunan Province(Grant No.2022JJ30700);the Natural Science Foundation for Excellent Young Scholars of Hunan(Grant No.2021JJ20057);the Science and Technology Plan Project of Changsha(Grant No.kq2305006);the Innovation Driven Program of Central South University(Grant No.2023CXQD033).

摘　　要：Estimation of velocity profile within mud depth is a long-standing and essential problem in debris flow dynamics.Until now,various velocity profiles have been proposed based on the fitting analysis of experimental measurements,but these are often limited by the observation conditions,such as the number of configured sensors.Therefore,the resulting linear velocity profiles usually exhibit limitations in reproducing the temporal-varied and nonlinear behavior during the debris flow process.In this study,we present a novel approach to explore the debris flow velocity profile in detail upon our previous 3D-HBPSPH numerical model,i.e.,the three-dimensional Smoothed Particle Hydrodynamic model incorporating the Herschel-Bulkley-Papanastasiou rheology.Specifically,we propose a stratification aggregation algorithm for interpreting the details of SPH particles,which enables the recording of temporal velocities of debris flow at different mud depths.To analyze the velocity profile,we introduce a logarithmic-based nonlinear model with two key parameters,that a controlling the shape of velocity profile and b concerning its temporal evolution.We verify the proposed velocity profile and explore its sensitivity using 34 sets of velocity data from three individual flume experiments in previous literature.Our results demonstrate that the proposed temporalvaried nonlinear velocity profile outperforms the previous linear profiles.

关 键 词：Debris flow Velocity profile Temporal varied feature NONLINEAR Stratification aggregation algorithm 

分 类 号：P642.23[天文地球—工程地质学]