基于GIS平台与证据权的地震滑坡易发性评价
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摘要
汶川地震诱发了数以万计的滑坡灾害.应用地理信息系统与遥感技术,选取地震烈度、岩性、坡度、断层、高程、坡向、河流与公路8个因素作为汶川地震滑坡影响因子,采用证据权方法,对研究区内汶川地震滑坡进行灾害易发性研究.检验表明,易发性评价结果的正确率达到81.855%.不同因子组合评价结果表明,地震烈度对滑坡易发性分区结果影响最大,而地质、地形、人类活动因素对地震滑坡影响相对较小.使用自然分类法则方法将研究区内滑坡按易发程度分为极高易发区、高易发区、中易发区、低易发区与极低易发区5类,极高易发区与高易发区面积之和约为11 255.93km2,占研究区总面积的23.12%,其中发育滑坡面积为521.98km2,占滑坡总面积的73.36%.
Wenchuan earthquake triggered tens of thousands of landslides.Eight factors that influence landslide occurrence,including seismic intensity,lithology,slope angle,faults,elevation,slope aspect,drainages,and roads were created in raster data format base on geographical information system(GIS) and remote sensing(RS) technologies.The landslide hazard map was derived by using weight-of-evidence modeling.Earthquake-induced landslide susceptibility zonings of other eight impact factor combination categories were analyzed and mapped one after another,using GIS raster analysis methods.The eight different impact factor combinations analysis suggests that seismic intensity play an important role in determining the landslide susceptibility index value,while geological,geomorphological,and human-related factors only play minor roles.The resulting susceptibility map was divided into five categories,i.e.extremely high,high,moderate,low,and extremely low by using Natural Breaks law.The validation results show satisfactory agreement between the susceptibility map and the existing data on landslide distributions in the form of area under curve(AUC) up to 81.855%.The area with extremely high and high susceptibility accounts for about 11255.93km2,23.12% of the study area,including landslide areas of 521.98km2,73.36% of all landslide occurrence areas.
引文
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