灾害学2016，Vol.31Issue(2)：226-234,9.DOI:10.3969/j.issn.1000-811X.2016.02.042
基于加权信息量模型的藏东南地区滑坡易发性评价
Landslide Susceptibility Assessment Based on Weighted Information Value Model in Southeast Tibet
摘要
Abstract
Southeast Tibet located in the east-central Tibetan plateau where the topography and geological structures is complex.The region is one of the areas seriously suffered from landslide disasters in China.Based on the geological disaster investigation and the correlative factors analysis,it is concluded that landslides generally oc-cur at soft-hard layer of sandy slate,phyllite,mudstone,slate;hard layer of sandstone,limestone and loose sedi-ments.The areas which slope gradient slope are greater than 45°and the elevation range from 2500m to 4000m also occur landslides frequently.And the landslides density is greatly influenced by fault.With the increase of fault density and decrease of distance to drainages and roads,the landslide occurrence is increasing.According to above analysis,seven typical factors are selected as evaluation factors including the formation lithology,slope,slope di-rection,elevation,fracture densities,drainages and roads.The evaluation model based on weighted information value is established to analyze landslide susceptibility in Southeast Tibet.The resulting susceptibility map showed five classes of landslide susceptibility,i.e.extremely high,high,moderate,low,stability.The extremely high grade areas are mainly distributed along the both side of active faults and major rivers.The high grade areas expand along the both side of extremely high grade areas border.The moderate grade areas are mostly along the tributaries of the great rivers and deep-cutting valleys,as well as the areas with relatively high fracture densities.The low grade areas have relatively low fracture densities,and there are no great rivers pass through.The stability areas areprimarilydistribute in the areas where islack of faults and high mountain areas where human engineering activity is weak,as well as areas where is relatively flat.By examination,the evaluation result has high accuracy.It pro-vides a reference forlearning the development characters of the landslideand disaster prevention plan in southeast Ti-bet.关键词
藏东南/GIS/加权信息量法/滑坡/易发性Key words
Southeast Tibet/GIS/weighted information value/landslide/susceptibility分类
天文与地球科学引用本文复制引用
杜国梁,张永双,吕文明,张广泽,周成灿,郭长宝..基于加权信息量模型的藏东南地区滑坡易发性评价[J].灾害学,2016,31(2):226-234,9.基金项目
国家科技基础性工作专项课题（2011FY110100－2）；“十二五”国家科技支撑课题（2011BAK12B09）；中国地质调查局项目（12120113038000）；中铁二院科研计划（二院科字201303）；国家自然科学基金项目 （）
