基于流域单元和信息量法的白龙江流域泥石流危险性评价

发布时间：2019-05-06 14:13

【摘要】：基于流域单元和信息量法对甘肃省白龙江流域泥石流危险性展开评价,采用区域内已知的309条泥石流沟对评价结果进行验证.结果表明:评价为中度和重度泥石流危险性的沟谷中有79%实际发生过泥石流活动,表明将流域单元和信息量法相结合的方法对泥石流危险性评价的结果基本上符合研究区泥石流的现状,而且评价精度和准度较高;地震动峰值加速度、流域面积和归一化植被指数是影响白龙江流域泥石流危险性评价结果的主要因素;中度及重度危险性的沟谷主要集中分布于宕昌县、舟曲县、武都区和文县,其中以宕昌县、武都区和舟曲县3个地区最为严重,文县次之,迭部县主要为轻度及以下.
[Abstract]:The risk of debris flow in Bailong River basin of Gansu Province was evaluated based on watershed unit and information method. 309 known debris flow gullies in the region were used to verify the evaluation results. The results show that 79% of the valleys with moderate and severe debris flow risk have actually occurred debris flow activity. It is shown that the results of debris flow risk assessment by the combination of watershed unit and information method basically accord with the status quo of debris flow in the study area, and the accuracy and accuracy of the evaluation are high. The peak acceleration of earthquake ground motion, watershed area and normalized vegetation index are the main factors that affect the risk assessment results of debris flow in Bailong River basin. The moderate and severe dangerous gullies were mainly distributed in Dangchang County, Zhouqu County, Wudu District and Wen County, among which Dangchang County, Wudu District and Zhouqu County were the most serious areas, Wen County followed by Wen County, and Diebu County mainly mild and lower than those in Dangchang County, Wudu District and Zhouqu County.
【作者单位】：兰州大学资源环境学院甘肃省环境地质与灾害防治工程研究中心;
【基金】：国家国际科技合作专项(2013DFE23030) 甘肃省民生科技计划项目(1503FCME006) 甘肃省科技支撑计划(1604FKCA098) 国家重点基础研究发展计划(973计划)项目(2014CB744703) 国家自然科学基金国际合作项目(41661144046) 中央高校基本科研业务费专项资金项目(LZUJBKY-2015-K10)
【分类号】：P642.23

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