基于GIS的巴东县新城区滑坡灾害危险性区划  

GIS-based landslide hazard zonation of new seat of Badong County

作　　者：杜娟[1] 殷坤龙[1] 陈丽霞[1] 

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《自然灾害学报》2011年第1期149-155,共7页Journal of Natural Disasters

基　　金：国家自然科学基金项目:三峡库区库岸滑坡及其次生涌浪灾害风险预测研究(No.40872176);国家科技支撑计划项目:极端冰雪气候与地质灾害相关性研究(2008BAC47B01)

摘　　要：巴东县新城区是三峡库区滑坡灾害最为发育的地段之一。通过还原滑坡形成前的物质组成和历史环境,选取了影响滑坡发育的地层岩性、水位影响带等9项评价指标。完善了基于地形条件的不规则单元划分方法,对研究区进行了斜坡评价单元的划分,使得评价单元具有更明确的地质意义和更完善的地质结构。此外,将各影响因素图与斜坡评价单元分布图叠加得到计算单元,在计算单元信息量求解的基础上提出了斜坡评价单元信息量的计算方法,进行了基于斜坡评价单元的危险性区划,得到了巴东县新城区滑坡灾害危险性区划图。分析结果表明,水位影响带、居民区、公路分布区及顺向坡坡型与滑坡灾害发生的相关性最大。高危险区占城区面积的16.4%,主要分布在长江两岸临江地段。The new seat of Badong County is one of the regions in which the landslide disaster is the most serious in the Three Gorges Reservoir area. Based on the return of material composition and historical environment before the occurrence of landslide, nine evaluation indexes were selected, including lithologic formation, water level variation and so on. By perfecting the division method of irregular unit based on the terrain condition, the study area was divided into slope evaluation units to make the evaluation units have mot6 definite geological significance and more consummate geologic structure. Besides, each map layer of influence factor was superposed with distribution map of slope evaluation units to obtain the calculation units, and the information content calculation method of slope evalu- ation unit was proposed on the basis of information content solving of calculation unit. Based on the slope evaluation units, hazard zonation is presented, and the landslide hazard zonation map of the new seat of Badong County was generated. Results show that the correlation between, the influence of floatation range of river stage, residential are- a, influence area of road, consequent slope, type and landslide hazard is largest. Sixteen point four percent area of the new seat of Badong County belongs to high risk area, and distributes along the bank of Changjiang River mainly.

关 键 词：滑坡 危险性区划 不规则单元 信息量模型 GIS 

分 类 号：P642.22[天文地球—工程地质学]