改进AHP和TOPSIS法在滑坡灾害易发性评价中的应用——以贵州毕节地区为例

Application of Combination to Landslide Hazard Susceptibility Assessment Based on Improved AHP and TOPSIS Method : A Case of Bijie, Guizhou Province

滑坡易发性评价是一个涉及多种因素、多个目标的复杂问题,一些关键性指标数据不易采集,量化方面也存在尺度不一、标准不同的现象。本次研究采用改进的AHP法,建立滑坡灾害易发性评价矩阵;通过改进的TOPSIS法,引入卡方检验思想,研究了贵州毕节地区的滑坡灾害易发性,比较8个评价单元与最优方案(最易发等级)的贴近度,编制了该地滑坡灾害易发性等级图。研究结果显示,滑坡灾害极易发区包括毕节市(C毕节=0.110 8)、纳雍县(C纳雍=0.124 2);高易发区包括赫章县(C赫章=0.097 2)、黔西县(C黔西=0.077 6);中易发区包括织金县(C织金=0.041 9)、大方县(C大方=0.034 4)和金沙县(C金沙=0.055 7);低易发区为威宁县(C威宁=0.027 1)。研究结果与历史灾害统计数据较为吻合;将AHP和TOP-SIS法组合应用于滑坡灾害易发性评价属于新的尝试,与传统算法相比,该组合法计算更加简便,评价结果较为准确。

Landslide susceptibility evaluation is a complex issue about multiple factor and multiple . Some of the key indicators or data is not easy to capture, there are also different scales and different standards on quantization. The paper based on the improved AHP method to establish landslide hazard susceptibility assessment matrix. Through the improved TOPSIS method, selecting a chi square test ideas and comparing the close degree about 8 evaluation with the optimal solution （the most prone level）. It has comple ted landslide hazard of liability and its liability level mapping in Bijie area of Guizhou province. The results showed that the most susceptible areas includes Bijie CBJ = 0. 110 8） and Nayong county （CNv = 0. 124 2）; he high susceptible areas includes Hezhang county （CHz ==0. 097 2） and Qianxi county （CQx = 0. 077 6） ; he middle susceptible areas includes Zhijin county （Czj 0. 041 9）, Dafang county （CDF=0. 034 4） and Jinsha county （CJS =0. 055 7）; he low susceptible areas includes Weining county （CWN 0. 027 1）. The results of the study fit with the historical disaster statistics. It＇ s new that application of combination to landslide hazard susceptibility assessment based on improved AHP and TOPSIS method. Compared with the traditional method, this calcula tion is simpler and more convenient, evaluation result is more accurate.