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Analysis of the winter thermal transfer potential in the source reservoirs of the Middle Route
of the South-to-North Water Diversion Project

1
1
2
1

LIU Lijin ，TUO Youcai ，DENG Yun ，KANG Jingwei ，ZHANG Xu 1

（1. State Key Lab. of Hydraulics and Mountain River Engineering，Sichuan University，Chengdu 610065，China；

2. China South-to-North Water Transfer Group Middle Route Corporation Limited. Qu Shou Branch，Nanyang 473000，China）
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，he spring-summer cold-water effect on downstream reaches has been exacer⁃
t
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.

Keywords：Danjiangkou Reservoir；Middle Route of the South-to-North Water Diversion Project；thermal energy

transfer；heat transfer potential；water transfer capacity

（责任编辑：韩 昆）
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