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在土壤渗透速率低、地下水位高的合肥市建造了3个构型和设计参数各异的生物滞留设施开展现场中试,考察设施的水文效应以及对径流的净化效果。借助经现场试验数据验证率定的RECARGA模型,结合当地的降雨特性选择适用于合肥地区的生物滞留设施构型和设计参数。研究表明,建有下排水系统的生物滞留设施的服务面积比宜取5%~7%,填料渗透速率宜取3~5cm/h,设施的表面储水区深度宜取15~20 cm,内部储水区的设置可以大幅削减排水管出流量。当地过低的原土渗透速率使得渗透型生物滞留设施的应用受到很大的限制。
In Hefei where soil infiltration rate is low and groundwater level is high, three bio-retention facilities with different configuration and design parameters are built to conduct on-site pilot tests to examine the hydrological effects of facilities and the purification effect on runoff. Based on the RECARGA model verified by the field test data and the local rainfall characteristics, the configuration and design parameters of bioretention facilities suitable for Hefei area were selected. Studies have shown that the service area ratio of bioretention facilities with a built-in drainage system should be between 5% and 7%, the infiltration rate of the infill should be 3 ~ 5cm / h, the depth of the surface water storage facilities should be 15 ~ 20cm, The setting of the water storage area can drastically reduce the outlet flow of the drainage pipe. The local low penetration rate of native soil has greatly restricted the application of osmotic bio-retention facilities.