Freshet disaster risk zonation techniques at small mountainous watershed are made a research and study based on the extend collection.Therefore,risk factors such as rainfall,topography,rivers distributed and vulnerability factors of population,GDP distributions,land use types are extracted to be freshet disaster risk zonation indexes,and entrusts with the weight to each indexes,then a method of weighted-evaluating base on Arcgis was used for risk map zonation at small mountainous watershed.By instance analysis the highest risk area primarily in Magui town and along the river banks.Moreover,risk zonation result precision is verified by comparison with the data of historical freshet disasters,which provide a scientific basis for the freshet disaster risk prevention and management of this area.%在广泛收集资料的基础上,对山区小流域山洪灾害风险区划技术进行了研究.以降雨、地形地貌、河流分布等因素提取了危险性因子,以人口、GDP分布和土地利用类型等因素提取了易损性因子,作为山洪灾害风险区划指标,通过层次分析法(AHP)赋予权重,利用加权综合的Arcgis空间叠加方法获得了山区小流域山洪灾害风险区划图.通过实例分析,研究区山洪灾害高风险区主要分布在马贵镇,并且集中在河流两岸.通过与历史山洪灾害点进行验证,风险区划结果精度较高,可为研究区山洪灾害防治和风险管理提供科学依据.
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