摘要
实现自然因素对山洪灾害影响的定量分析可为灾害防治提供科学参考。在定性分析山洪灾害自然影响因素的基础上,以长江流域的小流域为研究单元,采用主成分分析法分析各类山洪灾害的主控因素;采用单因素和多因素的统计分析方法定量分析各类型山洪灾害与自然因素的相关关系。结果表明,溪河洪水、滑坡的主控因素为降雨因子(最大6 h降雨量和年平均大雨日数),而泥石流的主控因素为最大6 h降雨量和植被指数。各因素对山洪灾害的影响呈现非线性特征,多因素的交互效应显著。
The quantitative analysis of influence of natural factors on mountain torrent hazards can provide scientific reference to the integrated disaster prevention and control. Through qualitative study of the influential natural factors,the main controlling factors on the mountain torrent hazards were recognized by principal component analysis with a small watershed as evaluation unit.The single factor and multi- factor statistical analysis are used to analyze the correlations between the natural factors and the various types of mountain torrent hazards. The results show that the main controlling factors on both stream flood and landslide are the rainfall factors（ maximum 6h rainfall and annual average heavy rain days）,and the debris flow is controlled by maximum 6h rainfall and vegetation index. The correlation analysis results show that the influences of natural factors on different types of mountain torrent hazards are nonlinear,and the interactions of different factors are significant.
出处
《人民长江》
北大核心
2016年第14期1-6,共6页
Yangtze River
基金
国家自然科学基金项目(41471229
41271304)
水利部公益性行业科研专项经费资助项目(201301059)
关键词
主成分分析法
山洪灾害
长江流域
debris flow
principal component analysis
nonlinear
landslide
stream flood
