城市道路生物滞留带溢流口设计方法探讨

随着生物滞留技术在海绵城市建设中的广泛应用,生物滞留带的优化设计已成为研究热点之一,其中溢流口的合理设计对生物滞留带的雨水径流控制效果和稳定运行具有重要意义。在实际工程应用中,由于缺少溢流口相关水力特性及设计计算方法的系统研究,往往直接把城市道路雨水口移至生物滞留带作为溢流口。然而生物滞留带溢流口与城市道路雨水口水力特征存在较大区别。针对上述问题,通过对生物滞留带溢流口水力特性的分析,计算了常见溢流口的过流能力,并举例对其工程应用选型及设计方法进行了分析,以期为生物滞留带溢流口的优化设计提供依据。

DISCUSSION ON DESIGN METHOD OF BIORETENTION OVERFLOW OUTLET ALONG THE URBAN ROADS

With the widespread application of bioretention in the construction of sponge city in China, the optimal design of bioretention was paid more and more attention. However, due to the absence of systematically research on hydraulic characteristics analysis and design methods, the design method of urban road grate inlet was often directly adopt in overflow outlet design in the bioretention. However, there was a great difference between the hydraulic characteristics of overflow outlet in bioretention and traditional grate inlet on the road. For the above problems, the hydraulic characteristics of the overflow outlet in the bioretention was analyzed via theoretical methods, and the drainage capacity of which was discussed. The design method of overflow outlet in bioretention was analyzed with an example, so as to provide references for the optimal design of the bioretention overflow outlet.