摘要
高山峡谷区是滑坡灾害频发地区,随着气候变化和人类活动加剧,滑坡呈多发、频发态势。本文选择坐落于横断山高山峡谷区的西藏江达县作为研究区,利用野外调查获取的85个滑坡数据,选取坡度、河流密度、地貌类型、降水量、距断层距离、道路密度、地震动峰值加速度、岩性等8个稳定性影响因素,运用地理探测器对滑坡稳定性的影响因素进行了探测。结果表明:(1)按滑坡体体积划分等级,江达县滑坡主要以中、小型滑坡为主;按其稳定性划分,50%以上的滑坡处于稳定状态;按危险等级划分,以Ⅲ级、Ⅳ级为主;江达县滑坡主要沿河流与道路分布,全县地面调查发现85处滑坡全部分布于河流附近,其中71.76%的滑坡分布于道路两侧。(2)江达县滑坡稳定性的主要影响因子为地貌类型、河流密度、道路密度和距断层距离,其贡献率分别为0.501,0.477,0.465,0.332;当影响因子两两相互作用时,因子解释力总是大于单个因子对滑坡稳定性的解释力,即当两种影响因子相互作用时,对于滑坡的失稳具有促进作用。
The high mountain and gorge area is an typically area,where geological disasters happen frequently.Especially landslide is one of the most serious geological disasters.Recently relative researches on geological disasters showed that landslides had an increasing trends due to the impacts of both climate change and human activities.In this study,Jiangda County in Tibet Autonomous region was selected as our study area,which located in the high mountain and gorge area of the Hengduan Mountain Region.In addition,using the landslide data for 85 sites based on field survey,choosing Slope,River density,Geomorphic type,Precipitation,the distance from the fault,Road density,the ground motion peak acceleration and Lithology as 8 influencing factors on landslide,and then employing the Geodetector model to analyze the impact of various variables on landslide stability.The results showed that 1)according to the volume of landslide,medium and small landslides are main types in Jiangda County;According to its stability,more than 50%of the landslide is in a stable state;according to the danger level,they are mainly divided intoⅢ,Ⅳ.In space,it is mainly along rivers and roads in Jiangda County,which caused by the limitations of the field survey besides physical factors.Because all 85 landslide survey sites located near rivers,and more than 71%sites are distributed on both sides of the road.2)The geomorphic type,River density,Road density and the distance from the fault are major factors to affect the stability of the landslide in Jiangda County,its contribution rate are 0.501,0.477,0.465 and 0.332,respectively.When the influence factors interact in pairs,the explanatory power of factors is always greater than that of a single factor to the stability of landslides.In other words,when the two influencing factors interact,they always promote the instability of landslides.
作者
支泽民
陈琼
张强
周强
刘峰贵
赵富昌
陈永萍
ZHI Zemin;CHEN Qiong;ZHANG Qiang;ZHOU Qiang;LIU Fenggui;ZHAO Fuchang;CHEN Yongping(College of Geography,Qinghai Normal University,Xining,Qinghai 810008,China;High Level Forum of Plateau Science and Sustainability,Xining,Qinghai 810008,China;State Key Laboratory of Surface Process and Resource Ecology,Beijing Normal University,Beijing 100875,China;Key Laboratory of Environmental Change and Natural Disaster,Ministry of Education,Beijing Normal University,Beijing 100875,China)
出处
《中国地质灾害与防治学报》
CSCD
2021年第2期19-26,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(2019QZKK0906)
国家重点研发计划(2019YFA0606902)。
关键词
滑坡稳定性
地理探测器
高山峡谷区
影响因素
landslide stability
geographic detector
alpine canyon
influence factors
