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传统的城市空间开发模式缩短了初始产流时间,增大了暴雨径流峰值和径流总量,成为城市雨洪问题的根本症结所在。采用SWMM研究了山地城市典型区域在开发前和现状用地布局情景下的径流效应,并采用绿色屋顶、绿色屋顶+渗透广场、调节池、绿色屋顶+渗透广场+调节池四种雨水控制利用方案进行了模拟分析。结果表明,径流曲线的形状与降雨过程线相似;现状雨水控制利用方案的径流峰值和径流总量可分别达到开发前的7倍和7.1倍;调节池能削减峰值流量,最高可削减65%;绿色屋顶、绿色屋顶+渗透广场、绿色屋顶+渗透广场+调节池对径流总量和径流峰值具有双重削减效果,其中,绿色屋顶+渗透广场+调节池的削峰减量效果最好,分别可达81%和90%。
The traditional model of urban space development has shortened the initial runoff time and increased the peak storm runoff and total runoff, which has become the crux of the urban rainstorm problem. SWMM was used to study the runoff effect of the typical urban mountainous area before and after the development of the current land use layout. Four types of rainwater control schemes were adopted, including green roof, green roof + infiltration square, regulating pool, green roof + infiltration square + regulating pool Simulation analysis. The results show that the shape of the runoff curve is similar to that of the rainfall course; the current runoff peak and runoff total can reach 7 times and 7.1 times respectively before the development; the regulating reservoir can reduce the peak flow rate by up to 65%; Green roof, green roof + infiltration square, green roof + infiltration square + regulation pool have double reduction effect on total runoff and runoff peak. Among them, green roof + infiltration square + regulation pool have the best effect of peak reduction and reduction, respectively 81% and 90%.