摘要
云南省德钦县曾多次暴发较大规模的泥石流,是云南遭受地质灾害最严重的地区之一。根据直溪河泥石流的分区、物源、流体和堆积等特征,首先确定了直溪河泥石流的5种成灾模式:崩塌-碎屑流、岩质滑坡-碎屑流、土石混合体滑坡-碎屑流、松散堆积层-基岩接触面滑坡-碎屑流和松散堆积层内滑坡-碎屑流;其次,采用FLO-2D模型对直溪河在10年、20年、50年和100年一遇暴雨周期下发生泥石流时的运动情况进行模拟,定量分析了不同降雨重现期的最大流速、最大堆积深度、冲出沟口堆积距离和体积规模。结果表明:该泥石流暴发时具有启动加速度大、流速快、破坏力强、流通区长的特点;当100年一遇的泥石流发生时,其最大流速达到了3.07 m/s;最大泥深为2.27 m;泥石流冲出方量为84419 m^(3);致灾面积达到91600 m^(2)。研究结果可为直溪河泥石流灾害防治与治理提供数据参考,为德钦县防灾减灾工程设计提供依据。
Deqin County is one of the areas suffering the most serious geological disasters in Yunnan Province.Based on the development characteristics of the debris flow in the Zhixi River,this study identifies five disaster-generating modes for the debris flow in the Zhixi River:Collapse-clastic flow,rock landslide-clastic flow,soil-rock mixture landslide-clastic flow,loose accumulation layer-bedrock contact surface landslide-clastic flow and landslide in loose accumulation layer-clastic flow.The FLO-2D model is used to simulate the debris flow movement in the Zhixi River under the rainstorm cycle of 10,20,50 and 100 years,and the maximum flow velocity,the maximum accumulation depth,the accumulation distance and the volume scale in different rainfall return periods are quantitatively analyzed.The results show that the debris flow is characterized by high acceleration,fast velocity,strong destructive force,and long circulation area when it erupts.When the debris flow occurs once in 100 years,its maximum velocity reaches 3.07 m/s,the maximum mud depth is 2.27 m,the volume of debris flow washed out is 84419 m^(3),and the disaster area reaches 91600 m^(2).The results provide quantitative data reference for the prevention and control of debris flow disasters in Zhixi River,and also provides an important basis for the design of disaster prevention and mitigation projects in Deqin County.
作者
王俊豪
管建军
魏云杰
高培强
梅傲霜
张东伟
WANG Junhao;GUAN Jianjun;WEI Yunjie;GAO Peiqiang;MEI Aoshuang;ZHANG Dongwei(China Institute of Geo-Environment Monitoring(Guide Center of Prevention Technology for Geo-hazards,MNR),Beijing 100081,China;Electronic Information School,Wuhan University,Wuhan,Hubei 430072,China;School of Earth Science and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2021年第6期187-195,共9页
Hydrogeology & Engineering Geology
基金
中国地质调查局地质调查项目(DD20190647,DD20179609)
第二次青藏高原综合科学考察研究项目(2019QZKK0904)。
关键词
直溪河
泥石流
成灾模式
暴发周期
FLO-2D
防灾减灾
Zhixi River
debris flow
disaster model
outbreak cycle
FLO-2D
disaster prevention and mitigation
