摘要
平原河网地区地势平坦流速较缓,水体抗污染能力弱,改善水系连通性对水环境质量提升至关重要。以水系连通性较差的盛泽镇跃进联圩为研究对象,通过开展引调水试验,构建圩区河网水动力模型,探索圩区水利工作调度运行规则、河网水系连通方法以及相应的水环境变化规律。研究以水龄作为水系连通性的一种时间尺度参量,建立了跃进联圩水动力-水质-水龄的河网水环境模型,模拟了5种引调水方案下,圩内水系连通性及水质改善情况,并构建了压力、状态与响应的引调水连通效果评估体系,实现了对水系连通性变化与水环境改善水平的定量分析。结果表明:从水体交换时长来看,研究区域主要河道水体交换时间在5天以内,水体连通性越好的河道,水龄越短;从水质指标变化来看,调水实验中圩内的水环境氨氮变化最为明显,对引调水响应度高,模拟结果显示水龄与氨氮浓度变化趋势基本一致,水体连通性越好,水龄越短,有利于氨氮的削减;从引调水方案来看,单一调度方式对圩内水系连通性改善能力有限,特别是在河网内水体流动性弱的区域,同时使得圩区内水体流动性差异增大,更容易造成河网内水系连通性以及水质的空间分布差异,形成局部的滞水区或死水区。因此,采用多源引水与多区域排水相配合的调度方式,可以加强水系连通性,改善水环境质量。
The plain river network area has a flat terrain and slow flow velocity,resulting in a limited ability to resist pollution.Therefore,enhancing the connectivity of the water system is crucial for improving the quality of the water environment.This article focuses on the Yuejin polders which has poor water system connectivity in Shengze Town as the subject of research.By conducting water diversion experiments and constructing a hydrodynamic model of the river network in the polders area,the study explores the scheduling and operation rules of water conservancy work,methods of connecting the river network,and the corresponding changes in the water environment.The study utilizes water age as a time scale parameter to measure the connectivity of the water system.It establishes a river network model for hydrodynamics,water quality,and water age in the Yuejin polders.The simulation evaluates the connectivity and water quality improvement in the polders area under five water diversion schemes.Additionally,an evaluation system of pressure,state and response is constructed to quantitatively analyze changes in water system connectivity and the level of water environmental improvement resulting from water diversion.The results reveal that from the perspective of the length of water exchange,the exchange time of water bodies in the main river channels of the research area is within 5 days.The greater the connectivity of these water bodies,the shorter the water age becomes.From the perspective of changes in water quality indicators,during the water diversion experiment,the most noticeable change in the water environment inside the polders is the level of ammonia nitrogen.It shows a strong response to water diversion,and simulation results indicate that water age generally aligns with the concentration of ammonia nitrogen.Enhanced connectivity of water bodies leads to a shorter water age,which aids in reducing ammonia nitrogen levels.From the perspective of water diversion scheme,the uni-source water diversion and uni-region dra
作者
夏文文
王晨波
邓宇
陈黎明
刘承磊
汤云高
XIA Wen-wen;WANG Chen-bo;DENG Yu;CHEN Li-ming;LIU Cheng-lei;TANG Yun-gao(Jiangsu Environmental Monitoring Center,Nanjing 210019,Jiangsu Province,China;Taihu Water Quality Monitoring Centre Station,Nanjing 210019,Jiangsu Province,China;Hydrology and Water Resource Department,Nanjing Hydraulic Research Institute,Nanjing 210029,Jiangsu Province,China;Nanjing Shangqing Environmental Technology Co.,Ltd.,Nanjing 210022,Jiangsu Province,China;Jiangsu Ecological Environment Monitoring Co.,Ltd.,Nanjing 210019,Jiangsu Province,China)
出处
《中国农村水利水电》
北大核心
2024年第3期96-104,共9页
China Rural Water and Hydropower
基金
国家重点研发计划项目(2021YFC3200304)
江苏省环境监测科研基金项目(2205)。
关键词
平原河网
水系连通
水龄
效果评估
plain river network
water system connectivity
water age
effectiveness evaluation
