城市广场“海绵化”设计案例——以南昌市新建区心怡广场改造为例

摘要

城市广场作为海绵城市的主要节点,海绵化设计具有十分重要的意义.以南昌市新建区心怡广场“海绵化”改造为例,用容积法计算出径流控制总量,合理划分了3个汇水分区,并在每个汇水分区布置了不同的海绵设计技术.通过增设植草沟、雨水花园、调蓄池可有效控制广场的径流总量,实现雨水的错峰排放.而在雨水花园和调蓄池设置溢流管,可满足暴雨重现期5年以上,多余的雨水径流可排入附近市政雨水管网中,最终实现“小雨循环利用,大雨不内涝”的目标.%City square as the main node of the "sponge city",its "sponge" design is of great significance.In this paper,the "sponge" transformation of Xinyi Square in Xinjiang District of Nanchang is taken as an example.The total amount of runoff control calculated by volumetric method was used to divide three catchment partitions rationally.In each catchment area,different sponge design techniques were applied.Through the provision of grass ditch,rain garden and storage pond,the total runoff of the square had been effectively controlled to avoid rainfall discharge at peak flow.By setting overflow pipes in the rain garden and storage pond,the system could deal with rainstorms with return period of larger than 5 years.The excess rainwater runoff could be discharged into the nearby municipal rainwater pipe network,finally realizing the goal of "light rain can be recycled;heavy rain is not waterlogging".