长江南京段不同径流 潮汐动力作用下突发污染事故对饮用水水源地的影响研究  

Study on the Impact of Sudden Pollution Accidents on Drinking Water Sources under Different Runoff-Tide Powers in Nanjing Section of the Yangtze River

作　　者：杨啸宇 王欣 丁磊[1] 王逸飞 周玲霞 缴健[1] 臧英平 YANG Xiaoyu;WANG Xin;DING Lei;WANG Yifei;ZHOU Lingxia;JIAO Jian;ZANG Yingping(Nanjing Hydraulic Research Institute,Port and Navigation Channel Sediment Transport Lab.,MOT,Nanjing,Jiangsu 210029,China;Nanjing Yangtze River Administration Office,Nanjing,Jiangsu 210011,China)

机构地区：[1]南京水利科学研究院,港口航道泥沙工程交通行业重点实验室,江苏南京210029 [2]南京市长江河道管理处,江苏南京210011

出　　处：《环境监控与预警》2023年第4期45-51,共7页Environmental Monitoring and Forewarning

基　　金：南京市水务科研基金资助项目(202001)。

摘　　要：长江南京段水动力条件复杂,突发污染事故对下游饮用水水源地影响难以预测。基于构建的长江南京段二维水动力水质耦合数学模型,对不同径流潮汐动力作用下的突发污染事故进行模拟,分析其对长江水源地的影响。结果表明:洪季径流作用较强,污染团扩散速度受潮汐影响较弱,各水源地受污染团的影响时长基本接近,约为2.5~3.5 h。枯季径流作用减弱,污染团扩散速度受潮汐影响增强,越下游处受潮汐影响越大,各水源地受污染团的影响时长依次为:长江江浦水源地<燕子矶水源地<龙潭水源地。枯季污染物传播时的浓度大于洪季,洪季污染物传播浓度呈现随距离增大浓度减小的趋势。枯季流速受到潮汐影响,径流稀释作用减弱,使得污染物经八卦洲分流后的浓度略小于传播向下游的浓度。The hydrodynamic condition of Nanjing section of the Yangtze River is complex,making it difficult to predict the impact of sudden pollution accidents on downstream drinking water sources.Sudden pollution accidents under different runoff-tide powers are simulated to analyze the impact on the water sources based on a two-dimensional hydrodynamic-quality-coupled numerical model of Nanjing section of the Yangtze River.The results show that the runoff effect is strong in flood seasons,and the diffusion rate of the pollution cluster is weakly affected by the tide.The influence duration of the pollution cluster in each water source is basically close,about 2.5~3.5 h.The effect of runoff in dry seasons weakens,and the diffusion rate of pollution cluster is affected more by the tide.Downstream is affected more by the tide and the influence duration of each water source shows in the order as follows:Jiangpu water source<Yanziji water source<Longtan water source.The pollutant concentration in dry seasons is greater than that in flood seasons,pollutant concentration in flood seasons decreases with the increase of distance.The flow velocity in dry season is affected by tide,and the dilution effect of runoff is weakened,making the pollutant concentration after the diversion of Baguazhou slightly smaller than concentration transmitted downstream.

关 键 词：长江南京段 突发水污染事故 饮用水水源地 径流潮汐动力 

分 类 号：X824[环境科学与工程—环境工程]