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为了有效地控制城市雨洪,选取武汉市汤逊湖流域作为研究区,建立一个基于D8算法的分布式城市雨洪模型,实现对城市暴雨积水动态模拟.通过对产汇流和管网排水过程进行简化,建立了流域雨洪模拟模型,并分别利用该流域2013年7月5-7日和2010年7月11-13日降雨径流资料进行模型率定及验证.与实测资料对比,模型率定期的积水总量相对误差为5.4%,典型地段积水深度相对误差均值为9.5%,绝对误差均值为18.9mm,均方根误差(RMSE)为20.0mm;验证期的典型地段积水深度相对误差均值为14.9%,RMSE为49.3mm.模拟结果表明:基于D8算法的分布式城市雨洪模型能够较好地模拟城市雨洪过程,可以进一步用于未来条件下城市雨洪情景分析,为城市雨洪控制提供决策依据.
In order to effectively control the urban rainstorm, the paper selects the Tangxun Lake basin in Wuhan as the study area, and establishes a distributed urban stormwater model based on the D8 algorithm to realize the dynamic simulation of urban stormwater accumulating water. The model of rainfall and runoff was established and validated by using rainfall and runoff data from July 5 to July 7, 2013 and July 11 to July 20, respectively.Compared with the measured data, the model rate The relative error of the regular total water volume was 5.4%. The average relative water depth of the typical section was 9.5%. The mean absolute error was 18.9mm and the root mean square error (RMSE) was 20.0mm. During the validation period, The relative mean error is 14.9% and the RMSE is 49.3mm.The simulation results show that the distributed urban stormwater model based on D8 algorithm can better simulate the process of urban rainfall and flood, and can be further used for the analysis of urban storm flood scenarios in the future, as Urban flood control provides the basis for decision-making.