摘要
泥石流地质灾害是天水地区主要的地质灾害发育类型之一,多年来一直困扰着当地的经济和社会发展,威胁着群众的生命财产安全。本文选取了天水市甘谷县比较典型的孙家沟作为研究对象,在分析其自然地理概况和新构造运动特征的基础上,分析了其水文地质条件、岩土体工程地质特征,从而得出了以下结论:研究区泥石流的形成条件主要有地形地貌,充分的固体物质补给以及降水条件3个方面;该泥石流沟可分为形成区、流通区以及堆积区3个区域;泥石流的流态、冲淤变化、流速及流量等受流域形态、沟道特征、固体松散物质数量及补给特征、降雨强度等控制。
Debris flow is one of the main types of geological disasters in Tianshui area,which has puzzled the local economic and social development for many years and threatened the people's lives and property.Based on the analysis of the general situation of physical geography and the characteristics of neotectonic movement,the hydrogeological conditions and the engineering geological characteristics of rock and soil mass are analyzed,the conclusion is as follows:The formation conditions of debris flow in the study area are mainly in three aspects:topography,sufficient solid material supply and precipitation conditions;The debris flow gully can be divided into three zones:Formation Zone,circulation zone and accumulation zone.The flow pattern,erosion and deposition,velocity and discharge of debris flow are controlled by the shape of the basin,the characteristics of the channel,the quantity and supply of solid loose material,and the intensity of rainfall.
作者
张元
ZHANG Yuan(Geological Survey of Gansu Province,Lanzhou 730000,Gansu,China)
出处
《资源信息与工程》
2020年第6期98-100,共3页
Resource Information and Engineering
关键词
甘谷县
孙家沟
形成条件
泥石流
发育特征
Gangu County
Sunjiagou
formation conditions
debris flow
development characteristics
