重庆市清江河流域山洪致灾临界面雨量研究

Research on Area Rainfall Threshold of Flash Flood in Qingjiang River Basin of Chongqing

为研究重庆市清江河流域的山洪致灾临界面雨量,利用FloodArea模型对该流域2014年8月11日的山洪过程进行模拟,采用统计分析方法确定雨-洪关系得到流水坡、龙洞沟、龙嘴和万里学校隐患点在淹没水深分别为0.6,1.2和1.8m下对应的临界面雨量,结果如下:1)FloodArea模拟的花林站最大水深出现时间与实际一致,最大淹没深度与实际相差0.295m,模拟结果与实际情况符合.2)不同隐患点淹没水深与不同小时尺度的累积面雨量的相关性不一样,分别选取2,2,4和6h累积面雨量作为流水坡、龙洞沟、龙嘴和万里学校隐患点的临界面雨量的小时尺度.

In this paper,the FloodArea model was used to simulate the torrential flood and flash flood process in the Qingjiang River valley of Chongqing on August 11,2014.The statistical analysis was used to determine the area rainfall thresholds of flash flood at four warning spots--Liushuipo,Longdougou,Longzui and Wanli school--on different submerged depths.The results show that,1)the time simulated by Flood Area model when the submerged depth is the maximum of Hualin station is in accordance with the actual one.The difference between the simulated maximum water depth and the actual one is 0.295m.Overall,the simulation results of FloodArea model is in line with the actual situation.2)The correlation between submerged water depths at different warning spots and accumulative area rainfall for different hours is different.The hourly scale of accumulative area rainfall of the above four warning spots is 2h,2h,4h and 6h respectively.