基于“容积法”的海绵城市道路计算关键步骤分析及优化

Analysis and Optimization of Key Steps in Calculation of Sponge City Roads Based on"Volumetric Method"

以某一城市主干路为案例,采用传统容积法及改进容积法分别对其进行了海绵城市调蓄容积的计算。结果显示:针对同一场地,采用改进容积法计算的年径流总量控制率小于传统容积法计算值,传统容积法计算结果偏不安全;另外,改进容积法是通过强调分散式布置海绵城市设施,鼓励增大服务面积来增大调蓄容积,从而提高年径流总量控制率的,与海绵城市强调分散式源头控制的理论更加一致。

Taking an urban trunk road as a case,the traditional volumetric method and the improved volumetric method are used to calculate its storage volume of sponge city.The result shows that the total annual runoff control rate calculated by the improved volumetric method is less than that of the traditional volumetric method at the same site.The calculation result of the traditional volumetric method is not safe.In addition,the improved volumetric method emphasizes the decentralized arrangement of sponge city facilities and encourages the increment of service area to increase the storage volume in order to improve the total annual runoff control rate,which is more consistent with the theory that the sponge city emphasizes the decentralized source control.