九寨沟九寨天堂泥石流沟特征分析与模拟预测  

Characteristics and Numerical Simulation of Debris Flow in Jiuzhai Paradise,Jiuzhaigou

作　　者：熊坤勇 范宣梅[1] 杨帆[1] 夏冰 XIONG Kun-yong;FAN Xuan-mei;YANG Fan;XIA Bing(State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection,Chengdu University of Technology,Chengdu,610059,China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059

出　　处：《科学技术与工程》2020年第27期10989-10995,共7页Science Technology and Engineering

基　　金：四川省国土资源厅科研项目(KJ-2018-22);国家自然科学基金创新研究群体科学基金(41521002)。

摘　　要：为了研究九寨沟地震后九寨天堂泥石流沟发育特征和影响范围,通过现场勘查、数值模拟、遥感影像解译查清流域内地质灾害数目、物源特征和成因机理等。基于无人机测量数据选取Massflow软件中的Voellmy模型进行数值模拟,模拟泥石流十年一遇物源量、流速和堆积范围,根据模拟参数预测五十年和百年一遇泥石流特征。模拟结果表明:十年一遇平均速度6.5 m/s,堆积范围0.103 km^2,实际堆积面积0.096 km^2。研究结论:流域下伏地层岩石破碎,容易形成松散堆积体,表层松散颗粒极易被雨水带入沟域内形成泥石流;河流改道致使沟谷对岸岸坡坡脚受泥石流侵蚀现象严重,岸坡整体稳定性下降可能性增大,局部有崩滑现象,严重威胁对岸301省道的通行安全。In order to study the development characteristics and influence scope of debris flow gully inJiuzhai Paradise after the Jiuzhaigou earthquake,the number,source,and origin of geological disasters in Jiuzhai Paradise,a scenic spot of Jiuzhaigou,a mountainous area famous for tourism in Sichuan,SW China,were investigated on-site in combination with numerical simulation and remote sensing image interpretation.The Voellmy model in Massflow software was selected to simulate the debris flow source quantity,velocity,and accumulation range once every 10 years based on the measured data of unmanned aerial vehicle.The simulation results show that the average velocity is 6.5 m/s,the accumulation range is 0.103 km^2,and the actual accumulation area is 0.096 km^2.It is concluded that rocks underneath the study area are broken and easy to form debris flows into gully area by rainwater.The hill foot of the opposite side of the gully has been seriously eroded due to river diversion;and the risk of collapse of the riverbank is increasing,which poses a serious threaten to the safety of the 301 provincial highway across the bank.

关 键 词：泥石流 九寨沟地震 数值模拟 九寨天堂 

分 类 号：P624.23[天文地球—地质矿产勘探]