水利水电技术（中英文）2025，Vol.56Issue(4)：145-157,13.DOI:10.13928/j.cnki.wrahe.2025.04.012
乌东德水库水温结构时空演化特性及下泄水温时滞效应
Spatiotemporal evolution characteristics of water temperature structure and lag effect of discharge water temperature in Wudongde Reservoir
摘要
Abstract
[Objective]Clarifying the spatiotemporal evolution characteristics and temperature lag effect of high dams and large reservoirs can provide a scientific basis for stacked beam gate scheduling,which is fundamental for alleviating discharge of low-temperature water and protecting the survival and reproduction of fish in the lower reaches.[Methods]Through numerical simulation and based on the measured hydrological data,water temperature data,meteorological boundary data from 2020 to 2022,and design operation data in an average water year,a three-dimensional numerical simulation model of water temperature for the Wudongde Reservoir area was developed.The spatiotemporal evolution characteristics of water temperature structure and lag effect of discharge water temperature after reservoir operation were analyzed.[Results]The result showed that:(1)In spring and summer,a distinct vertical stratification of water temperature was observed in the Wudongde Reservoir,with a temperature difference of 11～12 ℃.After the flood season,as the thermal exchange within the water body increased,the vertical water temperature gradually became uniform.No significant water temperature stratification was observed in autumn and winter.(2)There was a clear issue of low-temperature water discharge in spring and summer,and high-temperature water discharge in winter from the reservoir.Monitoring data from 2020 to 2022 indicated that the discharge water temperature in May was,on average,2.68℃ lower than the natural water temperature at the dam site,and the discharge water temperature in December was,on average,4.78℃ higher.Simulation result during the stable operation period indicated that from March to June,the monthly average discharge water temperature was 0.91～4.09 ℃ lower than the natural water temperature at the dam site.From December to February of the following year,the monthly average discharge water temperature was 1.34～4.34 ℃ higher.(3)After the impounding of reservoir,the time for the water temperature to reach 14℃ and 18℃ each year was delayed to varying degrees compared to before the dam construction.The occurrence time of suitable spawning water temperature for fish in the lower reaches was postponed by 30～50 days,with the delay ranked as follows:Rhinogobio ventralis＞Jinshaia sinensis,Four major Chinese carps,Common carp,Crucian carp＞Lepturichthys fimbriata.[Conclusion]The result show that the stratification of water temperature in the Wudongde Reservoir,along with the low-temperature discharge water it causes,has varying degrees of negative effects on fish reproduction in the lower reaches of the river.Therefore,scientific measures must be implemented to address these issues.关键词
乌东德水库/库区水温结构/下泄水温/滞温效应/鱼类繁殖/数值模拟Key words
Wudongde Reservoir/water temperature structure in reservoir area/discharge water temperature/temperature lag effect/fish reproduction/numerical simulation分类
水利科学引用本文复制引用
刘志成,张迪,林俊强,夏继红,朱博然,彭期冬,任玉峰,靳甜甜..乌东德水库水温结构时空演化特性及下泄水温时滞效应[J].水利水电技术（中英文）,2025,56(4):145-157,13.基金项目
国家自然科学基金青年科学基金项目(52209107) （52209107）
智慧长江与水电科学湖北省重点实验室基金项目(2422020009) （2422020009）
中国华能集团有限公司总部科技项目(HNKJ20-H26) （HNKJ20-H26）
