基于GIS的嘉陵江北碚段岸坡地质灾害危险性评价研究

The Geologic Hazard Evaluation of Bank Slope in Beibei by Using GIS

运用投影寻踪聚类评价方法和GIS空间叠置方法对重庆市北碚区嘉陵江段岸坡的地质灾害危险性进行了评价,研究发现:岸坡稳定性差的面积为18.98%,稳定性较差的面积为37.77%,两者之和占研究区总面积的56.75%;滑坡、泥石流多分布在向斜与背斜的过渡区域、河湾的凹岸和支流汇入处;基于加速遗传法的投影寻踪评价方法可以用于地质灾害研究,确定因子图层权重.

The study used the method PPCE and based on RAGA and GIS spatial analysis interacts to evaluate geologic hazard of the reach of Jialing River in Beibei Chongqing.In this study,the authors used the new methods of RAGA and PPCE to analyze the regional geologic data which were obtained from studing area and combined with the redevelopment function of GIS using VBA script language,which carried out vector intersect and raster calculation.It is drawn the conclusion that the poor stability account for 18.98% and the less poor stability account for 37.77%,both the sum of account for 56.75%;landslides debris flow mainly distribute in the transition between syncline and anticline.The PPCE based on RAGA is efficient approach in the field of geologic hazard analysis and provide a new way of method for the researching of valley geological disasters.