摘要
甘肃省陇南市白龙江流域泥石流灾害事件高发区与暴雨中心、高发期与暴雨集中期均有很好的对应关系.短时间强降水是激发该区域泥石流的主要降水类型,10 min雨强可以作为该区域泥石流预报因子,灾害事件当次降水量和10 min雨强的函数关系可以用于估算研究区不同区域泥石流临界降水量.沟谷沿岸中、低植被覆盖下的砂岩、粉砂岩、泥岩、千枚岩等软弱岩层区,在强降水条件下较短时间内就会发生泥石流灾害,应在该区域加大防灾减灾力度.
It was showed that a high occurrence area of debris flow events was consistent with a rainstorm center, and the activities of events also changed monthly with the variations in precipitation in the Bailong River Basin of Longnan Region, Gansu Province. Concentrated rainfall in a short time was the main rainfall pattern which triggered debris flows in the study area, and precipitation in 10 minutes could be considered as a factor for regional debris flows prediction, which can be used to estimate the critical precipitation of debris flows. A region with a dense population and sandstone/siltstone/phyllite/loess, etc, which are of weak and fragile lithology, is much more prone to debris flows. Effective measures should be taken for disaster reduction in this region.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第3期295-300,共6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)
中央高校基本科研业务费专项资金项目(lzujbky-2014-266)
关键词
泥石流
降水特征
暴雨
白龙江流域
debris flow
precipitation characteristic
rainstorm
Bailong River Basin
