生物滞留槽快速设计方法及实例研究

Rapid design and example research on bioretention groove

为便于生物滞留技术在海绵城市建设中的推广应用,提出了一种生物滞留槽快速设计方法——汇流比速算法,本方法基于水量平衡原理,综合考虑了降雨量,降雨历时,下垫面类型,滞留槽表面蓄水层深度、填料渗透性能和储水性能、植被密度等因素对生物滞留槽调控效应的影响,同时避免了复杂的设计计算。据此方法设计建造的生物滞留槽实际运行监测结果表明,生物滞留槽对道路径流调控效果明显,其对中小型降雨的径流量削减率维持在80%以上,径流中主要污染物负荷削减率在85%以上,采用汇流比速算法设计生物滞留槽方法简便,效果可靠。

In order to facilitate the application of bioretention technology in the construction of sponge city, the confluence ratio rapid algorithm is proposed as a kind of bioretention groove design method. This method is based on the principle of water balance, considering the influence of such factors as rainfall,rainfall duration, underlying surface types,bioretention surface storage layer depth, fillers permeability and water storage properties, vegetation density on the regulation effects of bioretention groove, to avoid the complex calculation and design. A set of bioreten-tion grooves is designed and built by this method. The actual operation results show that the road runoff regulation effect of the bioretention groove is of significance. The runoff reduction rates of medium and small rainfall events are maintained at more than 80%, with the main pollutant load reduction rates greater than 85%. It also indicates that the confluence ratio rapid algorithm for bioretention design is more simple and effective.