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传输型植被浅沟构造简单、经济实用,是海绵城市建设的重点推广技术之一。通过在深圳光明新区国家LID雨水综合利用示范区的现场监测研究,探讨了中到大雨下传输型植被浅沟对污染物质以及雨水径流总量、峰值流量的实际控制效果。结果表明,中到大雨下,传输型植被浅沟对SS、COD、NH_4~+-N、NO_3~--N、TN和TP的去除率分别为28.91%~67.29%、37.76%~64.57%、21.84%~34.65%、19.39%~25.99%、23.60%~39.97%和31.49%~48.83%,对径流总量的削减率为50.9%~66.3%,且径流峰值较降雨峰值滞后5~9 min;若设计重现期取1 a,深圳的传输型植被浅沟可接纳相当于自身面积1.79倍硬质路面所产生的径流。
Transmission-type shallow trench structure is simple, economical and practical, is one of the key promotion technologies for sponge city construction. Through the field monitoring research on national LID rainwater comprehensive utilization demonstration zone in Shenzhen Guangming New District, the actual control effect of pollutants, total runoff of rainwater and peak flow of shallow vegetation in transmission vegetation under moderate to heavy rainfall was discussed. The results showed that the removal rates of SS, COD, NH_4 ~ + -N, NO_3 ~ --N, TN and TP were 28.91% ~ 67.29% and 37.76% ~ 64.57%, respectively, 21.84% -34.65%, 19.39% -25.99%, 23.60% -39.97% and 31.49% -48.83%, respectively. The reduction rate of the total runoff was 50.9% -66.3%, and the runoff peak lagged 5-9 minutes later than the rainfall peak. If the design recovery period is 1 a, the transmission furrows in Shenzhen can accommodate runoffs corresponding to 1.79 times their own area of hard pavement.