测绘与空间地理信息
測繪與空間地理信息
측회여공간지리신식
Geomatics & Spatial Information Technology
2015年
9期
34-37
,共4页
信息提取%层次分析法%熵权%易发性评价
信息提取%層次分析法%熵權%易髮性評價
신식제취%층차분석법%적권%역발성평개
extraction%analytic hierarchy process%entropy weight%susceptibility assessment
通过对汶川县2008年landsat5和2014年landsat8遥感影像解译提取了地质灾害信息，利用DEM数据对2014年地质灾害的面积在高程、坡度、坡向等致灾因子下进行统计，利用层次分析法和熵权计分别计算主观和客观权重，进行权重拟合得到综合权重，建立起灾害敏感性评价模型对灾害的易发性进行预测。结果表明：震后新增地质灾害面积与2008年预测的高易发区叠加对比进行验证，两者空间分布基本一致，85．71％的新增地质灾害发生在预测高易发区，面积约为344．94 km2，验证结果良好，表明2014年汶川地质灾害易发性评价结果具备较高的可靠性和可行性。
通過對汶川縣2008年landsat5和2014年landsat8遙感影像解譯提取瞭地質災害信息，利用DEM數據對2014年地質災害的麵積在高程、坡度、坡嚮等緻災因子下進行統計，利用層次分析法和熵權計分彆計算主觀和客觀權重，進行權重擬閤得到綜閤權重，建立起災害敏感性評價模型對災害的易髮性進行預測。結果錶明：震後新增地質災害麵積與2008年預測的高易髮區疊加對比進行驗證，兩者空間分佈基本一緻，85．71％的新增地質災害髮生在預測高易髮區，麵積約為344．94 km2，驗證結果良好，錶明2014年汶川地質災害易髮性評價結果具備較高的可靠性和可行性。
통과대문천현2008년landsat5화2014년landsat8요감영상해역제취료지질재해신식，이용DEM수거대2014년지질재해적면적재고정、파도、파향등치재인자하진행통계，이용층차분석법화적권계분별계산주관화객관권중，진행권중의합득도종합권중，건립기재해민감성평개모형대재해적역발성진행예측。결과표명：진후신증지질재해면적여2008년예측적고역발구첩가대비진행험증，량자공간분포기본일치，85．71％적신증지질재해발생재예측고역발구，면적약위344．94 km2，험증결과량호，표명2014년문천지질재해역발성평개결과구비교고적가고성화가행성。
Geological disaster now happens more frequently in the region that had happened the earthquake.Continued monitoring, e-valuation and analysis of geological disasters contribute to preventing and mitigating geological disaster.Through the interpretation of the 2008 landsat5 and 2014 landsat8 remote sensing image of Wenchuan County, this paper got the geological disaster information. 20014 Geological disasters in hazard area elevation, slope, aspect, etc was statisticed by Use DEM data.Using Analytical Hierarchy Process and Entropy Weights to calculate subjective weights and objective weights.Fitting weight to get synthesis weights.Establishing an evaluation model of disaster sensitivity to predict disaster-prone.The prediction results show that ecological disaster most likely occurs in the district which has an elevation between 1 000~2 000 m, a slope between 30°~45°and rare vegetation along the Min-jiang River.Contrasting the new geological disaster area after the earthquake to the 2008 forecast of high-prone areas to verify the su-perposition, Both the spatial distribution are basically the same.85.71% of new geological disasters occurred in predicting high-prone areas, an area of about 344.94 km2 , Verification result is good.It Shows that 2014 Wenchuan prone geological disasters evalu-ation results has high reliability and feasibility.
