甘肃天水地区45a来强降水与洪涝灾害特征分析

Heavy Precipitation and Flood Disaster in Tianshui Prefecture of Gansu Province during the Last 45 Years

洪涝灾害是一种常见的自然灾害,对农业生产和人民生活有极大的影响.通过对甘肃天水地区强降水和洪涝灾害事件资料的整理,对其强降水事件、洪涝灾害变化特征以及二者间地联系进行了分析研究.现有资料统计显示,天水地区没出现过整个区域性洪涝灾害,以局地洪涝灾害为主,强降水事件和洪涝灾害具有显著的年代际和季节性变化特征.由于当地的土地蓄水性能很差,一般性的强降水就可能会产生洪涝灾害.随着气候变暖,这一地区的强降水事件和洪涝灾害呈增加趋势,建议当前应加强对局地强降水事件的防范工作.

Based on the data of heavy precipitation and flood disaster in Tianshui Prefecture of Gansu Province, the interdecadal variations Of heavy precipitation and flood disaster and their relationship are analyzed： The analyses show that there are prominent seasonal and interdecadal variations. There is no heavy precipitation or the flood disaster event over the whole prefecture. However, local flood disaster often takes place owing to the poor in soil store water： The flood disaster could be caused by a common heavy precipitation. Especially, along with the climate warming, the events of heavy precipitation and flood disaster become more and more. More attention should be given to the key task of reducing flood disaster brought by heavy precipitation