Evaluation The Hazard Degree Of The Landslide Of The Jin Sha River Upstream Area Based On Minimum Entropy

Debris flow, which as a sudden natural disasters, the ferocious, largeflow, destructive, shorter time and higher frequency of recurrence,iswidely distributing and often occuring. The mountains often happen debrisflow because their geological circumstances are proned to forming anddeveloping debris flow. China is a country with about two-thirds of thetotal land area is mountain. There, it is one of the countries undergoingsevere debris flows. The debris flow hazard area has stable life, socialproduction and economic development, in order to avoid the above problemsand protect people’s lives and property safety, an urgent need for studiesof debris flow.In this paper,20debris flow risk of Jinsha River basin comprehensiveevaluation process, using the nonlinear methods:"minimum entropy","pathanalysis","analytic hierarchy process","entropy","extension theory"and "the combination weighting method", and the characteristics of thedangerous degree of debris flow the evaluation model and differenceanalysis. There are the main research contents and contributions:1.The object of study is the Jinsha Jiang Bo Luo hydropower stationreservoir area of debris flow, through field investigation, datacollected and indoor data interpretation of finishing, analyses theconditions the overall development of hydropower station reservoir areaof debris flow Kim Shah Jean Polo, and introduced in detail the geologicalfeatures of the20typical debris flow and development. On the basis ofprevious studies, combined with the specific circumstances of debris flowin the study area, the preliminary extraction of12indices of debris flowevaluation.2. Applied the minimum entropy and path analysis to preliminary selection of evaluation index reduction optimization. The results of eachothers were {drainage density、loose material supply length ratio、Vegetation coverage、population density of the drainage、average gradientof the main channel、length of the main channel、drainage area}、{drainagedensity、population density of the drainage、average gradient of the mainchannel、average material、 length of the main channel、drainage area}、3．Applied the analytic hierarchy process and entropy method tocalculate the combination weighting.Respectively to establish debrisflow risk assessment in the study area of minimum entropy-extensiontheory model and path theroy-extension theory model of debris flow riskclassification in the studied area.4. In order to verifing the rationality and reliability of the twomodel, this paper introduced the traditional Liu Xilin model for debrisflow risk evaluation in the study area.The results showed that the minimumentropy-extension theory model has a higher safety and rationality.5. The commom evaluation indexs extracted by the two models weredrainage density, population density of the drainage, average gradientof the main channel, length of the main channel and drainage area, whichmaybe indicate thoese five index play important roles in evaluating thedebris flow hazard.