基于多目标的池州市齐山大道海绵化改造经验

Exploration of Urban Street Sponge Renovation Based on Multi-target:A Case Study of Qishan Street in Chizhou

城市道路雨水系统是连接源头地块和末端水体的重要输水通道,道路传统排水方式存在排涝压力大、径流污染严重、生态环境破坏等严峻问题。而海绵城市建设中,道路雨水系统的建设目标既包括针对中小降雨的径流污染与总量减排控制要求,也包括针对不同重现期暴雨的大、小排水系统等综合设计要求,还涉及道路路面和景观功能的完善和提升。因此,综合设计必然涉及道路、市政、园林等多专业的合作。阐述了既有道路改造如何进行源头控制、小排水和大排水设施的合理设计与衔接,以及系统优化;结合池州市海绵城市示范项目——"齐山大道"工程实例,阐述了如何整体考虑道路上下游关系和红线内外场地条件等,合理构建多目标海绵型道路雨洪控制利用系统,有效利用现状道路及周边土地资源,合理处理空间、竖向、绿地景观等场地条件之间的相互关系,优化整体方案,综合解决年径流总量控制、径流污染控制、道路内涝防治等问题,保护周边湿地生态环境,提高项目的综合效益。

Urban street storulwater system is the important channel which connects source block to downstream water bodies. The severe problems in the traditional street storm drainage system are considered as poor flood drainage, serious runoff pollution and ecological environment destruction. The targets of street stormwater system renovation in sponge cities include runoff pollution control and total runoff volume reduction control in the small storm events, the design requirements of major and minor drainage systerns for storm events with different recurrence periods, and also include the perfection and promotion of street surface and surrounding landscape. Therefore, multi-disciplinary cooperation is necessarily in- volved in the design process. This paper illustrates how to build the comprehensive system including source control system, minor drainage system, major drainage system in the process of street stormwater system renovation, and how to achieve reasonable design, connection and optimization among the three aspects. The sponge renovation project of Qishan street in Chizhou was taken as an example, this paper described how to build the comprehensive street stormwater system concerning the road connection between upstream and downstream, the site conditions inside and outside of street red lines. Simultaneously, it introduced the reasonable construction of multi-target sponge-type road stormwater control system, effective utilization of roads and the surrounding land. And the relationship among street space, vertical, landscape and other site conditions were illustrated to solve the problems of annual runoff volume control, runoff pollution, street flood and so on. As a result, the surrounding ecological environment could be protected, and the project comprehensive benefits could be enhanced.