生物滞留池水文水质效应模拟分析

为研究生物滞留池措施对雨水水文水质的调控作用,以宜兴市城区某试验区为研究区域,利用SWMM模拟软件,在5年、10年、100年设计重现期下,分别模拟城市化后有无生物滞留池措施的水文水质状况,并将两者比较分析。研究发现:占研究区域总面积10.75%的生物滞留池措施下,雨水径流量减少了12%左右,峰值流量降低了8%左右,入渗量增加了22%左右;污染物SS、COD、TN、TP总负荷量的削减率分别在10%、7%、9%、8%左右。结果表明:随着城市化进程日益加快,生物滞留池可有效地降低雨水径流量、增加雨水入渗量,削减雨水径流的峰值流量;同时还可以拦截一定量的颗粒悬浮物、营养物质、重金属等污染物。研究成果对海绵城市建设和雨水资源调控利用具有参考价值,对城市水生态建设具有重要意义。

Simulative analysis on hydrological and water quality effects of bioretention pond

In order to study the regulation and control effect from the measure of bioretention pond on the hydrology and water quality，an experimental area in the urban district of Yixing is taken as the study area，afterwards，the hydrological conditions with and without the measure of bioretention pond after the urbanization are respectively simulated with SWMM （Storm Water Management Model） simulation software under the conditions of the design recurrence periods of 5 years，10 years and 100 years，and then both of them are comparatively analyzed as well. It is found out through the study that the rainwater runoff is decreased by about 12%，the peak flowrate is lowered by about 8%，the infiltration is increased by about 22% and the reducing rates of the total loads of the pollutants of SS，COD，TN and TP are about 10%，7%，9% and 8% respectively under the condition with the measure of the bioretention pond with the area of 10.75% of the total area of the study area. The study result shows that following with the increasingly accelerated progress of urbanization，the bioretention pond can not only effectively decrease rainwater runoff，increase rainwater infiltration and reduce the peak flowrate of rainwater runoff，but can also intercept certain amounts of the pollutants such as suspended particles，nutritious matters，heavy metals，etc. The study result has referential value for the sponge city construction and rainwater sources regulation and utilization，thus has an important significance for the urban water ecologic construction.