基于灰色关联度法的泥石流沟危险性评价

Risk assessment of debris flow gully based on grey relevancy

在对北京市密云区泥石流沟进行野外调查后,借助GIS强大的地理信息提取与分析能力,获取各泥石流单沟数据,在此基础上,运用灰色关联度法对7个选定的评价指标的权重进行计算,并按照权重对7项因子进行分类与定量评分,计算出研究区各沟的泥石流危险度。得出密云地区中高危险度泥石流沟约占1/5,主要集中在冯家峪镇与大城子镇。

With the help of powerful geographic information extraction and analysis ability of GIS,the data of each debris flow gully are obtained after the field investigation of debris flow gully in Miyun District of Beijing,then,to calculate the weight of seven selected evaluation indexes based on GREY relevancy,and the seven indexes were classified and quantitatively scored according to the weight,which the risk degree the of debris flow gullys in the study area is calculated.It is concluded that the high and medium risk debris flow gullies account for about 1/5 in Miyun area,mainly concentrated in Fengjiayu town and Dachengzi town.