Spatiotemporal Distribution Characteristics of Water Temperature in Danjiangkou Reservoir Based on the Prototype Observation Data

  • DENG Xin-long , 1, 2 ,
  • CHEN Duan , 2 ,
  • SHI Hao-yang 2 ,
  • CHENG Jing-hua 3 ,
  • PENG Xiao-ran 3 ,
  • HUANG Ming-hai 2 ,
  • WANG Yue-gen 2 ,
  • MA Yu-jie 2
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  • 1. School of Hydrology and Water Resources, Hohai University, Nanjing 210024, China
  • 2. Institute of Hydraulics, Yangtze River Scientific Research Institute,Wuhan 430010,China
  • 3. South to North Water Diversion Middle Route Water Sourcecompany of limited liability, Danjiangkou 442700, China

Received date: 2024-12-02

  Revised date: 2025-02-13

  Online published: 2025-03-21

Abstract

The spatial and temporal distribution characteristics of water temperature in large reservoirs are an important basic research content in the fields of water environment and water ecology. Danjiangkou Reservoir, including Danku and Hanku, is the second largest reservoir in China and an important water source for the middle route of the South-to-North Water Diversion project. However, there is a lack of systematic water temperature observation and research of Danjiangkou Reservoir.This study conducted a one-year prototype observation of water temperature in the Danjiangkou Reservoir, analyzing the spatiotemporal variation characteristics of water temperature and their influencing factors, as well as the spatiotemporal changes and thermal stratification structure of the reservoir. The results indicate that the Danjiangkou Reservoir is a typical thermally stratified reservoir, with distinct seasonal variations in vertical water temperature distribution. During the flood season and normal water period, stable stratification occurs, and a double thermocline appears during the normal water period, while stratification is less pronounced during the dry season. The surface water temperature of the reservoir is highly correlated with air temperature, with a correlation coefficient of 0.976. The Dan Reservoir and Han Reservoir exhibit different hydrological characteristics, with the Han Reservoir having a water residence time of up to 257 days and a water exchange rate of 1.47, primarily exhibiting characteristics of a riverine reservoir. In contrast, the Dan Reservoir is more akin to a lacustrine reservoir, with a water residence time of up to 336 days and a water exchange rate of 1.04, and its vertical temperature stratification lasts longer than that of the Han Reservoir. The findings of this study provide significant foundational references for studies on the migration and transformation of nitrogen and phosphorus, as well as seasonal water quality changes, in the Danjiangkou Reservoir.

Cite this article

DENG Xin-long , CHEN Duan , SHI Hao-yang , CHENG Jing-hua , PENG Xiao-ran , HUANG Ming-hai , WANG Yue-gen , MA Yu-jie . Spatiotemporal Distribution Characteristics of Water Temperature in Danjiangkou Reservoir Based on the Prototype Observation Data[J]. Journal of Changjiang River Scientific Research Institute, 0 . DOI: 10.11988/ckyyb.20241227

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