Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Analyzing Flow Variation and Stratification of Paldang Reservoir Using High-frequency W ater Temperature Data

고빈도 수온 자료를 이용한 팔당호의 성층과 흐름 변화 분석

  • Ryu, In-Gu (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Lee, Bo-Mi (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Cho, Yong-Chul (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Choi, Hwang-Jeong (Watershed and Total Load Management Research Division, National Institute of Environmental Research) ;
  • Shin, Dong-Seok (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Sang-Hun (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Yu, Soon-Ju (Han River Environment Research Center, National Institute of Environmental Research)
  • 류인구 (국립환경과학원 한강물환경연구소) ;
  • 이보미 (국립환경과학원 한강물환경연구소) ;
  • 조용철 (국립환경과학원 한강물환경연구소) ;
  • 최황정 (국립환경과학원 유역총량연구과) ;
  • 신동석 (국립환경과학원 한강물환경연구소) ;
  • 김상훈 (국립환경과학원 한강물환경연구소) ;
  • 유순주 (국립환경과학원 한강물환경연구소)
  • Received : 2020.07.09
  • Accepted : 2020.09.22
  • Published : 2020.09.30
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Abstract

The focus of this study was to quantify the thermal stratification and analyze the relationship between the stratification structure and the tributaries to understand flow variations in the Paldang Reservoir. The vertical distribution of the temperature and density gradients, and the depth and thickness of the thermocline were quantitatively calculated using a lake physics tool (rLakeAnalyzer) and high-frequency monitoring data. Based on a density gradient of 0.2 kg/㎥/m, the thermocline was formed from mid-May to early-September 2019 and the other periods were weakly stratified or mixed. The thickness of the thermocline was developed until 4.7 m and the depth of the thermocline was formed at a depth of 3 - 6 m at the front of the Paldang Reservoir. During the formation of the thermocline, the Namhangang and Gyeongancheon tributaries with relatively high water temperature (low-density) flowed into the upper layer of the reservoir, and the Bukhangang tributary with low water temperature (high-density) mainly affected the lower layer of the reservoir. This is because the density currents were formed due to the difference in the water temperature of the tributaries. The findings of this study may be used for constructing high-frequency monitoring and quantitative data analyses of reservoirs.

Keywords

References

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