概率分析法计算下凹式绿地对雨水径流的截留效率

Evaluation of Stormwater Runoff Capture Efficiency in Low Elevation Greenbelt with Probabilistic Analysis Methodology

提出了一种适用于规划层面的评价下凹式绿地雨水径流截留效率的概率分析方法。在分析上海地区近20年降雨资料的基础上,运用概率统计的方法获得当地的降雨特性参数以及相关降雨特性概率分布函数,在此基础上确定降雨径流超出下凹容积导致发生溢流的概率,最终从概率平均的意义上估算一定下凹深度绿地的年雨水蓄渗效率,从而为下凹式绿地的设计提供了参考。

A probabilistic analysis methodology to evaluate storrnwater runoff capture efficiency in low elevation greenbelt is proposed, which is meaningful on the planning level. Through the statistical analysis on the rainfall information in recent 20 years in Shanghai, the local rainfall characteristics parameters and the probability density functions are obtained by probabilistic statistics. On this basis, the probability of overflow which results from stormwater runoff exceeding the volume of low elevation greenbelt is determined. The annual average storrnwater collection efficiency in low elevation greenbelt with different capacity is evaluated in the sense of probabilistic average, providing theoretical support for the design of low elevation greenbelt.