贡献权重模型在区域滑坡危险性评价中的应用

Application of contributing weights model in regional landslides hazard assessment

以攀枝花市米易县为研究区域,采用GIS技术,选取坡度、坡向、坡形、地层岩性和相对高差等5个指标作为评价因子,利用贡献权重模型对研究区的滑坡地质灾害进行危险性评价。评价结果经过检验符合实际情况:高危险度区占全区面积31.9%;中危险度区占全区面积52.6%;低危险度区占全区面积15.5%;高、中危险度区所包含的滑坡个数占到全区滑坡总数的95.9%。评价结果表明,GIS技术和贡献权重模型结合能够很好地为滑坡灾害危险性评价服务,可以解决过去危险性评价中效率低、精度差等问题,从而实现滑坡灾害评价的信息化和科学化。

Landslide risk zoning is an important basis of landslide management.In this paper,a contributing weight model was used to zone Miyi County for landslide risk assessment.The input data for zoning were mostly and automatically captured by GIS technology.The landslide inventory of the area was made from detailed field surveys and collection of academic material.The landslide-controlling parameters were considered to be gradient,aspect,slope shape,stratum and height difference.Among them,stratum was more important to landslide growth in the area than the other factors for its larger weight.The result was verified and confirmed to accord with the actuality.The high risk zone was covering 31.9% of the study area,the medium risk zone was 52.6% and the low risk zone was 15.5%.The number of landslides in high and medium risk zones was 95.9% of the total.compared with the traditional methods,the GIS-based processing had higher efficiency and accuracy,and a larger regional covering capability.It helped to realize a digitalized process of landslide risk assessment.