南水北调工程对南四湖下级湖水体交换特征影响研究OA北大核心CSTPCD
Study on the impact of South-to-North Water Diversion Project on the exchange characteristics of the lower level lake water of Nansi Lake
[目的]南水北调东线工程以南四湖为输水通道,工程运行后南四湖下级湖的流场变化较为复杂.为研究调水工程运行对下级湖及各个分区水体交换特征的影响,[方法]在收集南四湖下级湖地形、降雨、蒸发、风场等资料的基础上,构建了下级湖二维水动力和对流扩散模型,并进行了模型率定与验证,选取50 m3/s、2020-2021 年度调水期实际流量、设计流量125 m3/s共3 种流量工况进行了模拟分析.[结果]模拟结果显示:调水 148 d时,3 种流量工况下下级湖韩庄站至二级坝水位差分别为 0.06 m、0.12 m、0.36 m,韩庄站至二级坝水位比降分别为 1.0×10-6、2.1×10-6、6.2×10-6,下级湖平均流速分别提高0.15 cm/s、0.54 cm/s、0.87 cm/s,死水区和滞水区面积占比不断减小,湖区水体流动性大幅提升.实际流量工况模拟入下级湖共 6.6 亿m3,出下级湖 6.3 亿m3,其中下级湖旧水体占67%,外调水占33%.[结论]同一流量情况下,下级湖从南至北、从东至西水体更新时间逐渐变长,3 种流量工况下下级湖水体更新时间分别为 77 d、78 d、53 d.研究结果有助于定量分析调水情况下下级湖水体流动和交换过程,对南水北调东线工程南四湖段调度运行具有一定参考作用.
[Objective]The South-to-North Water Diversion Project utilizes Nansi Lake as a water transmission channel,and the flow field changes in the lower level lake water of Nansi Lake are more complicated after the project is in operation.The purpose of this paper is to study the effects of the water transfer project on the exchange characteristics of water in the lower level lake wa-ter of Nansi Lake and various subdistricts.[Methods]Based on the collection of topography,rainfall,evaporation and wind data of the lower level lake water of Nansi Lake,a convective diffusion model of the lower level lake was constructed,and the model rate was determined and verified.At the same time,a total of three flow conditions,namely,50 m3/s,the actual flow during the water transfer period in 2020-2021,and the design flow of 125 m3/s,were selected for simulation and analysis.[Results]The model result show that the water level difference from Hanzhuang Station of the lower lake to the secondary dam under the three flow conditions is 0.06 m,0.12 m,and 0.36 m,respectively,for 148 days of water transfer.The water level specific declines from Hanzhuang station to the secondary dam were 1.0×10-6,2.1×10-6,and 6.2×10-6 respectively.Lower lake mean flow ve-locity increased by 0.15 cm/s,0.54 cm/s,and 0.87 cm/s,respectively.The percentage of stagnant and stagnant water area has been decreasing,and the mobility of the lake's water bodies has increased significantly.Case 2 simulated a total of 660 mil-lion m3 of water into the lower lake and 630 million m3 of water out of the lower lake,with 67%of the old body of water in the lower lake and 33%of the water transferred from outside.[Conclusion]Lower lakes have progressively longer water renewal times from south to north and from east to west for the same flow conditions.The renewal times of the lower lake water body under the three flow conditions were 77 d,78 d,and 53 d,respectively.The result of the study help to quantitatively analyze the exchange process of the lower lake water under the water transfer situation,which is a reference for the scheduling and operation of the Nansi Lake section of the South-to-North Water Diversion East Route Project.
岳俊杰;桑国庆;张林;刘阳
济南大学 水利与环境学院,山东 济南 257000南水北调东线山东干线有限责任公司,山东 济南 257000
水利科学
数值模拟水动力特征水体交换更新时间流量南四湖下级湖
numerical simulationhydrodynamic characteristicswater exchangeupdate timeflowlower lake of Nansi Lake
《水利水电技术（中英文）》 2024 (006)
72-83 / 12
国家重点实验室基金项目(2021nkms02);山东省自然科学基金项目(ZR2020ME249);山东省科学基金青年项目(ZR202102240660)
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