水利学报2025，Vol.56Issue(5)：672-682,11.DOI:10.13243/j.cnki.slxb.20240784
南水北调中线工程源头水库冬季输热潜力分析
Analysis of the winter thermal transfer potential in the source reservoirs of the Middle Route of the South-to-North Water Diversion Project
摘要
Abstract
The Danjiangkou Reservoir,serving as the source reservoir for the Middle Route of the South-to-North Water Diversion Project,its thermal regime evolution characteristics and winter heat transfer capacity to the main canal are recognized as critical issues requiring exploration in research on enhancing winter water conveyance capac-ity.This study analyzed monitored water temperature data(2006-2022)from surrounding hydrological stations to reveal thermal characteristic variations before and after dam heightening,preliminarily clarify heat transport path-ways,and investigate the reservoir's winter heat transfer potential to the main canal.The results indicate that:(1)The Danjiangkou Reservoir is a stratified reservoir,and the stratification effect intensified after the dam was raised.The vertical temperature difference near the dam increased from 0.3-4.9 ℃ to 0.2-12.0 ℃,enhancing the reservoir's heat retention capacity.Consequently,the spring-summer cold-water effect on downstream reaches has been exacer-bated by up to 8.0 ℃,while the winter intake temperature at the headwork has been raised by as much as 2.1 ℃.(2)After the dam heightening,the winter intake temperature at the Taocha headwork showed altered responses to mul-tiple influencing factors:(ⅰ)its correlation coefficient with air temperature decreased from 0.85 to 0.78;(ⅱ)an abrupt shift in winter intake temperature was observed after 2013,with the Mann-Kendall trend test index(tau)changing from-0.11 to 0.16,indicating a gradual upward trend under high water-level operation;(ⅲ)the phase deviation angle between winter intake temperature and the inflow temperature from the Han River(with relatively large discharge)was essentially 0°,demonstrating increased coherence.(3)During winter operation,raising the res-ervoir level or increasing the flow withdrawal at the headwork can leverage spatial variations in temperature distribu-tion and heat transfer trajectories to supply additional heat to the headwork region,thereby further tapping the reser-voir's potential for heat delivery to the Middle Route.These findings offer technical support for formulating measures to enhance the winter water conveyance capacity of the Middle Route of the South-to-North Water Diversion Project.关键词
丹江口水库/南水北调中线工程/热量输移/输热潜力/输水能力Key words
Danjiangkou Reservoir/Middle Route of the South-to-North Water Diversion Project/thermal energy transfer/heat transfer potential/water transfer capacity分类
建筑与水利引用本文复制引用
刘礼锦,脱友才,邓云,康静伟,张旭..南水北调中线工程源头水库冬季输热潜力分析[J].水利学报,2025,56(5):672-682,11.基金项目
国家重点研发计划项目(2022YFC3202500) （2022YFC3202500）
