海绵城市建设技术对地下水污染的影响评价

Evaluation of Influence of Sponge City Construction Technology on Groundwater Pollution

为避免海绵城市建设技术的实施造成地下水污染,采用层次分析法和聚类分析法评价海绵城市建设技术对地下水污染的影响。结果表明,22项海绵城市建设技术对地下水的影响分为3个等级,一级技术共11项,增加了地表径流进入地下水的概率,但对雨水径流的净化效果有限;二级技术共7项,有一定的概率使得地表径流进入到地下水中,同时具有一定的净化雨水径流的能力;三级技术共4项技术,能降解或净化雨水径流中的大部分污染物。结合海绵城市建设技术对地下水潜在影响的评价结果,可为不同风险区域的海绵城市选取适宜的海绵城市建设技术提供科学依据。

In order to avoid groundwater pollution caused by the implementation of the construction technology of sponge City,the influence of the construction technology of sponge city on groundwater pollution was evaluated by using the analytic hierarchy process and cluster analysis.The results show that 22 sponge city construction technologies have three levels of influence on groundwater,11 of which are first-level technologies,which increase the probability of surface runoff entering groundwater,while the purification effect of rainwater runoff is limited;7 of which are second-level technologies,which have a certain probability to make surface runoff entering groundwater and have a certain degree of probability.The three-stage technology has four technologies,which can degrade or purify most pollutants in rainwater runoff.Combined with the evaluation results of the potential impact of sponge city construction technology on groundwater,it can provide scientific basis for the selection of appropriate sponge city construction technology for the sponge city in different risk areas.