摘要
重庆市北碚区是泥石流地质灾害主要高发区,其暴发受降雨条件、物源条件、地形地貌、地质构造、沟谷特征和植被等内外因素的制约。为有效评价各泥石流灾害暴发的危险性,依据重庆市北碚区泥石流灾害暴发的诸多影响因素,首先基于因子分析法对30条典型泥石流沟的大量数据进行了主因子判定,确定了地形地貌和物源条件、植被覆盖度、最大降雨量3个主因子,然后利用快速聚类法对各主因子综合得分进行聚类分析,进而根据聚类分析结果判定了各泥石流爆发的危险程度等级。危险性评价结果显示,重庆市北碚区30条泥石流沟中,暴发极度危险的有1条、高度危险的有3条、中度危险的有21条、低度危险的有5条,评价结果与各泥石流灾害爆发的实际情况相吻合。
Beibei district in Chongqing City is the primary area where debris flow hazard always occurred, and the outbreaks of debris flows are controlled by the rainfall, material source conditions, geographical conditions, geological structure, valley characteristics, vegetation and other internal or external factors. In this paper, in or- der to evaluate effectively the outbreak risk of debris flows in Beibei district, according to many factors of debris flows outbreak, and based on the method of factor analysis, massive data of 30 typical debris flows was ana- lyzed, and the three main factors of debris flow were classified, which contains topography and material source conditions, vegetation coverage, maximum rainfall. And then, the clustering analysis about main factors score was carried determined. out by the fast clustering method. Meanwhile, The evaluation results were consistent with th the outbreaks danger degree of debris flow hazard was e actual occurrence of these debris flows in Beibei dis- trict of Chongqing City, which show that one debris flow is extremely risk, three debris flows are twenty-one debris flows are moderate risk, and five debris flows are low risk. high risk,
出处
《现代地质》
CAS
CSCD
北大核心
2015年第2期454-460,共7页
Geoscience
基金
石家庄经济学院博士启动基金项目(124087)
关键词
泥石流灾害
因子分析
聚类分析
危险性评价
北碚区
重庆
debris flow hazard
factor analysis
clustering analysis
risk assessment
Beibei district
Chongqing
