人民长江2024，Vol.55Issue(6)：167-175,9.DOI:10.16232/j.cnki.1001-4179.2024.06.023
强震区沟谷宽缓组合对泥石流动力学特征影响研究
Influence of combination of gentle and steep gullies on dynamic characteristics of debris flows in a strong earthquake area
摘要
Abstract
There are a large quantity of wide-gentle gullies and narrow-steep gullies in upstream of Minjiang River basin.The geometry of gullies has important influences on kinetic characteristics of debris flows.Taking Taoguangou gully,a wide-gentle gully in the upper reaches of Minjiang River,as the research object,we used Massflow software to simulate the dynamic process of debris flow in the gully,and the dynamic characteristics of debris flow with"narrow-steep branch channel+wide-gentle main channel,or wide-gentle branch channel+wide-gentle main channel"were obtained.The results show that the combination of wide-gentle channels of different levels in the basin has a significant effect on the initiation mode and behavior of debris flows,which affects the velocity and mud depth of debris flows.Under the combination of"narrow-steep+wide-gentle",the flow ve-locity of debris flow is large in the early stage,the effect of down-cutting is obvious,the run-out path is long,and the sedimen-tation is more in the later stage.Under the combination of"wide-gentle+wide-gentle",the lateral erosion effect of debris flow in the trench is more significant,which intensifies the evolution of the trench.Both the two combinations have the risk of blocking the river and developing into a barrier lake.This study improves the understanding of the influence of wide-gentle channel com-bination on debris flow migration and is helpful to the future risk assessment of debris flow.关键词
泥石流/沟谷形态/宽缓-窄陡/动力特征/强震区/岷江上游Key words
debris flow/gully geomorphology/wide-gentle and narrow-steep/dynamic characteristics/strong earthquake area/upstream of Minjiang River分类
天文与地球科学引用本文复制引用
赵宇鹏,杨太强,王昆,程伟,罗军尧..强震区沟谷宽缓组合对泥石流动力学特征影响研究[J].人民长江,2024,55(6):167-175,9.基金项目
国家自然科学基金联合基金项目(U22A202602) （U22A202602）
