常州市运北主城区畅流活水方案设计与现场验证

Study on clean water diversion schemes to improve the water environment of Yunbei main urban area in Changzhou City

为改善常州市运北主城区水环境,采用数学模型计算和现场试验验证相结合的方法,开展畅流活水水环境提升方案研究。依据常州市区域地形和水系情况,确定主城区引水水源、引排格局和引水水量,结合现状工程条件,提出“利用长江优质水源、打造两条清水通道、新建四座活动溢流堰、形成三级水位差”的畅流活水方案。基于Infoworks ICM构建常州市主城区水动力数学模型,模拟澡港河入口水位3.80~4.00 m多种方案下,运北主城区内部河道流量分配情况,确定最佳入城水位,并结合现场试验验证了活水效果。结果表明,常州市运北主城区畅流活水方案实施后大部分河道流量显著增加,流速达7 cm/s以上,多项水质指标达到Ⅲ类及以上水平。研究成果可为其他平原河网地区水环境提升提供借鉴。

To improve the water quality in rivers in Yunbei main urban area of Changzhou City,a study of clean water diversion to improve the water environment based on numerical simulation and field test was conducted.The water source,water diversion pattern and quantity of water diversion were determined according to the regional topography and river system.Based on current engineering conditions,a clean water diversion scheme was proposed including“making use of the high quality water source of the Yangtze River,building two clear water channels,building four new movable overflow weirs and forming three-stage water levels.”Based on Infoworks ICM,the hydrodynamic mathematical model of the main urban area of Changzhou city was constructed.Through this model to simulate the distribution of river flow in the main urban area of Changzhou city under different schemes,the Zaogang river level was changed from 3.80~4.00 m,and the optimal entry level was determined.Based on the field test,the effect of hydrodynamic enhancement and water quality improvement was verified.The results indicate that most of the river flow increased significantly,the flow rate reached 7 cm/s or more,and many water quality indicators reached ClassⅢand above after the implementation of the clean water diversion scheme of the main urban area of Changzhou city.The research results can provide references for water environment improvement in other plain river network areas.