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岩溶地区暴雨内涝成因复杂,其中直接外因是连续高强度降雨,内涝受灾损失严重,因此迫切需要系统地分析岩溶地区的极端暴雨演变规律。广西区德保县是一个典型的岩溶地区,遭受过几次重大内涝灾害,利用该县7个雨量站1983~2013年逐时及逐日降雨资料,采用线性倾向估计法、累积距平曲线法、MannKendall法和ArcGIS技术,研究了德保县极端暴雨事件的时空演变规律。结果表明,近30年来德保县集中度高的短历时暴雨强度增加,该县西北部的短历时暴雨较强,极端降雨事件的突变年份在1998、2011年附近,应加强该地区的防洪排涝设施建设。
The cause of waterlogging in rainstorm in karst area is complex. Direct external causes are continuous high intensity rainfall and serious losses of waterlogging. Therefore, it is urgent to systematically analyze the evolution of extreme rainstorms in karst areas. Debao County, Guangxi Province, is a typical karst area and has suffered several major waterlogging disasters. Based on the hourly and daily rainfall data of seven rainfall stations in the county from 1983 to 2013, the linear tendency estimation method, cumulative anomaly curve method, MannKendall method and ArcGIS technology to study the spatiotemporal evolution of extreme heavy rain events in Dabao County. The results show that the intensity of short-duration heavy rainfall with high concentration in Deba County increased in recent 30 years, and the short-term heavy rainfall in the northwestern part of the county was strong. The extreme year of the extreme rainfall events was around 1998 and 2011, and should be strengthened. Facilities construction.