摘要
泥石流危险性评价对于重大工程选址、建设和防护具有指导意义。现阶段区域泥石流危险性评价的方法主要集中在层次分析法等主观方法上,对于客观方法应用较少。基于此现状,本文确定了泥石流危险性评价的主要影响指标,对客观变异系数法进行改进,使之同时考虑主客观因素,基于综合指数模型建立了泥石流危险性评价模型。并以西藏国道G109拉萨市和那曲市地区路段为研究对象,利用改进变异系数法,借助ArcGIS软件建立评价模型并进行危险性分区。评价结果显示:泥石流高危险区主要分布在拉萨至羊八井路段,与现场实地调查结果吻合较好,改进变异系数法可以作为评价泥石流危险性的方法。
The risk assessment of debris flow has guiding significance for the site selection,construction and protection of major projects.At present,the methods of regional debris flow hazard evaluation mainly focus on subjective methods such as AHP,and objective methods are less applied.This paper determines the main impact indicators of debris flow risk assessment,improves the objective coefficient of variation method,and considers both the subjective and objective factors.Based on the comprehensive index model,the debris flow risk assessment model is established.Taking the G109 section of the national road from Lhasa to Naqu in Tibet as a case study,the improved coefficient of variation method was used to establish the evaluation model and risk division by ArcGIS software.The evaluation results show that the high risk area of debris flow is mainly distributed in the Lhasa to Yangbajing section,which is in good agreement with field investigation.The improved coefficient of variation method can be used to evaluate the risk of debris flow.
作者
刘佳
赵海军
马凤山
郭捷
孙琪皓
段学良
LIU Jia;ZHAO Haijun;MA Fengshan;GUO Jie;SUN Qihao;DUAN Xueliang(Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics/Chinese Academy of Sciences,Beijing 100029,China;Innovation Academy for Earth Science, CAS, Beijing 100029, China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《中国地质灾害与防治学报》
CSCD
2020年第4期63-70,共8页
The Chinese Journal of Geological Hazard and Control
基金
第二次青藏高原综合科学考察研究专题(2019QZKK0905)。
关键词
泥石流
层次分析法
改进变异系数法
国道G109
debris flow hazard
AHP
improved coefficient of variation method
Highway G109
