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泥石流危险度的科学评估对有效保护人民的人身安全和财产安全方面有着重要意义。以四川省雅安石棉县、汉源县为例,本模型将泥石流影响因素分类为降雨因子、环境因子、水文因子、人为因子,利用ArcGIS 10.1平台中栅格计算器、网络分析、水文分析等栅格、矢量空间分析功能,采用层次分析法(AHP)对各项影响因子进行权重赋值,最终得出泥石流危险度评估模型。
The scientific assessment of the risk of debris flow is of great importance to the effective protection of people’s personal safety and property safety. Taking Shimian County and Hanyuan County in Ya’an County, Sichuan Province as an example, this model classifies the influencing factors of debris flow as rainfall factor, environmental factor, hydrological factor and human factor. By using the Grid Calculator, network analysis and hydrological analysis grid in ArcGIS 10.1 platform, Grid and vector space analysis function, AHP is used to assign weight to each influencing factor, finally the assessment model of debris flow hazard degree is obtained.