城市下凹式绿地长期运行蓄渗效率的概率分析

Probability Analysis of Storageinfiltration Efficiency of Urban Concavedown Greenbelt Under Longterm Operation Conditions

摘要:

提出了评估城市下凹式绿地蓄渗降雨径流长期运行效率的概率分析方法,并基于上海市近20年的小时降雨特性参数统计数据对上海市下凹式绿地的设计进行实例研究.结果表明,该方法能够满足城市下凹式绿地工程设计的要求；上海地区绿地下凹深度在80~160 mm之间可达到最佳应用效果,蓄渗效率可达90%以上.

关键词:下凹式绿地; 蓄渗效率; 概率分析; 降雨特性

Abstract:

Probability analysis method is put forword to estimate the longterm operation efficiency of urban concavedown greenbelt which stores and infiltrates rainfall runoff.Case study was also carried out for proper design of the concavedown greenbelt based on the 20year statistical data of the hourly rainfall characteristic parameters in Shanghai area.The results show that this method can ensure the safety of the engineering design of urban concavedown greenbelt,and that the optimal practical concave depth was 80~160 mm,under which the storageinfiltration efficiency could reach up to above 90%.

Key words:concavedown greenbelt; storageinfiltration efficiency; probability analysis; rainfall characteristic