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.
The watershed unit and information value method were used to evaluate the hazards of debris flow along the Bailongjiang River in Gansu Province and the evaluation results were validated by the 309 known debris flow valleys in the region, showing that the region was of moderate and severe hazards and 79% of the valleys had actually experienced a debris flow. It was well proved that this method could be applied to the assessment of the hazards of debris flow for its highly precise and accurate rating of risks. The peak ground acceleration, watershed area and normalized difference vegetation index were the criti- cal factors in the estimation of risks in the Bailongjiang River. The severe and moderate dangerous val- leys are mainly concentrated in Tanchang, Zhouqu, Wudu and Wenxian Counties, and especially danger- ous valleys are in the Tanchang, Wudu and Zhouqu Counties. Wenxian County is ranked the second and Diebu County is mainly of mild degree and below risk of a debris flow.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2017年第3期292-298,308,共8页
Journal of Lanzhou University(Natural Sciences)
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)
关键词
泥石流
危险性评价
信息量法
流域单元
白龙江
debris flow
assessment on the hazard
information value method
watershed unit
Bailongji-ang River
