水利水电技术（中英文）2024，Vol.55Issue(6)：72-83,12.DOI:10.13928/j.cnki.wrahe.2024.06.006
南水北调工程对南四湖下级湖水体交换特征影响研究
Study on the impact of South-to-North Water Diversion Project on the exchange characteristics of the lower level lake water of Nansi Lake
摘要
Abstract
[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.关键词
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Key words
numerical simulation/hydrodynamic characteristics/water exchange/update time/flow/lower lake of Nansi Lake分类
建筑与水利引用本文复制引用
岳俊杰,桑国庆,张林,刘阳..南水北调工程对南四湖下级湖水体交换特征影响研究[J].水利水电技术（中英文）,2024,55(6):72-83,12.基金项目
国家重点实验室基金项目(2021nkms02) （2021nkms02）
山东省自然科学基金项目(ZR2020ME249) （ZR2020ME249）
山东省科学基金青年项目(ZR202102240660) （ZR202102240660）
