金坛市饮用水源地保护方案研究

钱资荡是金坛市目前直接饮用水源地，根据环境监测结果，它已处于中营养化后期。借鉴国内外先进的湖泊管理经验，运用系统工程的思想和方法提出了切实可行的金坛市饮用水源地保护方案。该方案由4个工程子系统组成，（1）截污工程：在岸丘桥和南州桥位置各筑一节制闸（而岸丘桥工程又是首选工程），以封住湖泊两头入流，杜绝污染物进入水源地的截污工程；（2）引水工程：是截污工程的配套工程，利用一游长荡 湖来补充水量，并对3个引水工程设想进行了系统分析，推荐涵管方案，同时将长荡湖作为该市战略水源地一并纳入保护体系中；（3）湿地生态处理工程：对进入荡区前的芦苇区进行综合整治，发展以芦苇为主的湿地生态处理工程；（4）环湖绿色自然保护带工程：包括建设围湖芦苇荡、环湖林带、绿色食品基地以及污泥处置。最后还提出了三级水域保护区范围、水域行政管理体系建设以及工程方案分步实施计划。

PROTECTING SCHEME STUDY ON POTABLE WATER SOURCE DISTRICT IN JIN TAN CITY

As the direct potable water source in Jintan City, Qianzidangdistrict is in the later stage of mesotrophication upon the recent monitoring data. On the basis of some advanced experiences on lake management, this paper puts forward a feasible protective engineering scheme for potable water source district (Qianzidang) in Jin Tan in accordance with the principles and method of systems engineering. The scheme embraces four projects, namely (1) to build up sluices at Anqiu Bridge and Nanzhou Bridge (and the one at Anqiu Bridge is the first choice) so that pollutants can be from entering the lake;2)as a necessary accessory for the above project, to supplement water capacity from Changdang Lake as a strategic water source into the protection program, and culvert-pipe plan is recommended from two other alternatives through systematic analysis; 3)to carry out comprehensive realignment for some reed regions which are located at the entrances of the lake, and to develop a wetland ecosystem mainly with some reeds; and 4) to set up a green protection belt right round the lake, including planting reeds at lakebeach, building forest belt, developing bases of green foodstuff and disposing sludges in the lake base. Finally, recommendations including the three-scale protection regions, administrative management systems and implementing plan are provided.