藏中南玛尼岗南侧泥石流动力学特征、发展趋势及防治建议  

Dynamic characteristics,development trend and prevention suggestions of Southern Manigang debris flow in Central-southern Xizang

作　　者：彭忠 徐刚 曾谱 谢志勇 Peng Zhong;Xu Gang;Zeng Pu;Xie Zhiyong(Xizang Jinhai Mineral Resources Development Co.,Ltd.(Xizang Geological Survey Institute of Nuclear Industry),Chengdu,Sichuan 610059;The 10th Geological Brigade of Sichuan,Mianyang,Sichuan 621000)

机构地区：[1]西藏金海矿产资源开发有限公司(核工业西藏地质调查院),四川成都610059 [2]四川省第十地质大队,四川绵阳621000

出　　处：《资源环境与工程》2024年第6期707-713,720,共8页Resources Environment & Engineering

摘　　要：青藏高原中南部泥石流灾害较为发育,加强泥石流特征研究并防范其发生对保障人民生命财产安全具有重要意义。以西藏尼木县玛尼岗南侧泥石流为研究对象,通过卫片解译、现场调查、室内及现场试验等,分析泥石流的形成条件并进行动力学特征值计算,评价泥石流的易发性及发展趋势,提出相应的防治对策。结果表明,玛尼岗南侧泥石流沟内动储量为3.13×10^(4)m^(3),物源较为丰富,包括坡面侵蚀、沟道侧蚀、沟道下蚀3种物源;该沟沟床平均纵坡降为478.5‰,相对高差达540 m,具有纵坡比大、流速快、水动力强、搬运能力强、沿途物源补给丰富等特征,是一条典型的低频、稀性泥石流沟;该泥石流沟易发程度为中等,处于发展期(壮年期),尤其是在雨季强降雨的条件下,发生泥石流灾害的可能性仍然较大。因此,提出“清理+生态稳坡、拦挡、停淤、排导”的综合工程防治处理建议。Debris flow disasters are more developed in the central-southern Qinghai-Xizang Plateau.It is of great significance to strengthen the study of debris flow characteristics and prevent its occurrence to ensure the safety of people s lives and property.Taking the Southern Manigang debris flow in Nimu County in Xizang as the research object,through satellite image interpretation,field investigation,laboratory and field tests,the formation conditions of debris flow are analyzed and the dynamic characteristic values are calculated,then the susceptibility and development trend of debris flow are evaluated,and the corresponding prevention and control countermeasures are put forward.The results show that the dynamic reserves of provenance in the debris flow gully are 3.13×10^(4)m^(3),and the provenance types are slope erosion source,channel erosion source and channel erosion source.The average longitudinal slope of the debris flow gully is 478.5‰,and the relative height difference is 540 m,so the debris flow gully has the characteristics of large longitudinal slope ratio,fast flow velocity,strong hydrodynamic force,strong carrying capacity and rich source supply along the way,and it is a typical low-frequency and sparse debris flow gully.The degree of susceptibility of the debris flow gully is medium,and it is in the development period(prime period).Especially under the condition of heavy rainfall in the rainy season,the possibility of debris flow disaster is still large.Therefore,the comprehensive engineering prevention and treatment suggestions of“cleaning+ecological slope stabilization,blocking,silting and drainage”are put forward.

关 键 词：泥石流 动力学特征 泥石流易发性 青藏高原中南部 

分 类 号：P642.23[天文地球—工程地质学]