平原河网地区典型小流域水环境治理工程环境效应评估

摘要

Zhuashan Bay watershed is a typical plain river network area to the northwest of the Taihu Lake.In this article,a 1-D hydrodynamic-water quality network model based on MIKE model was established to assess the benefits of water environment treatment projects built in 2012 in the Zhushan Bay watershed.The pollutant reduction effects of the projects were summarized through analyzing the design documents and field investigating the operation techniques and results.Furthermore,indexes of total pollutant amount in the watershed as well as the variations of pollutants into the Taihu Lake before and after the treatment projects were built were calculated.Results revealed that under the constraint of pollutant capacity target,the amount of pollutants to be eliminated reduced from 2011 to 2012,and meanwhile,the amount of pollutants into the Lake also fell down,indicating that the treatment projects had played a positive role in improving regional water environment.%选取太湖西北部的竺山湾小流域为研究区域,针对平原河网地区水流特征,建立基于MIKE模型的竺山湾流域河网模型.以该区域内2012年实施的水环境治理工程为评估对象,通过整理各项工程设计资料、实地调研各项工程运行工艺、运行结果,汇总出各个工艺的减排效果.通过计算2011年、2012年污染物入河量,设置不同的运算工况,核算了水环境治理工程运行后该区域内各镇区水污染物总量达标情况及污染物人湖量变化情况.结果表明:在容量总量目标约束下,2012年实施的水环境治理工程使各镇区污染物需削减量较2011年有所降低,同时可降低各主要人湖河流污染物入湖量,说明水环境治理工程对竺山湾小流域内水环境起到一定的改善作用.