Journal of Environmental Impact Assessment (환경영향평가)

Korean Society of Environmental Impact Assessment (한국환경영향평가학회)
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Effect of Air Temperature Changes on Water Temperature and Hysteresis Phenomenon in Lake Paldang

기온 변화에 따른 팔당호 수온 영향 및 이력현상

  • Yu, Soonju (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Im, Jongkwon (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Lee, Bomi (Han River Environment Research Center, National Institute of Environmental Research)
  • 유순주 (국립환경과학원 한강물환경연구소) ;
  • 임종권 (국립환경과학원 한강물환경연구소) ;
  • 이보미 (국립환경과학원 한강물환경연구소)
  • Received : 2020.07.17
  • Accepted : 2020.09.21
  • Published : 2020.10.31
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Abstract

Long-term continuous data were used to investigate changes in air and water temperature and temperature hysteresis at Lake Paldang, the largest source of drinking water in South Korea. Based on the temperatures at Yangpyeong, near Lake Paldang, using a seasonal Mann-Kendall test, the rate of change of increase in temperature over the last 27 years (0.060℃/yr, 1993-2019) was higher than that of during 47 years (0.048℃/yr, 1973-2019). The air and water temperatures in Lake Paldang and its influent rivers had a high correlation (R > 0.9, p < 0.005); however, the water temperature increased at rate slower than the river water temperature, and the water temperature decreased slowly as the air temperature fell. The depth-averaged water temperature also changed more slowly than the surface water of the lake both when the air temperature was high and when it was low. This is likely because the lake has a larger area and a longer heat retention time than rivers, resulting in a greater hysteresis of water temperature at lake.

국내 최대 상수원인 팔당호를 대상으로 기온과 수온의 변화를 살펴보고 장기간 기온과 수온의 연속 자료를 활용하여 이력 현상을 살펴보았다. 계절 Mann-Kendall을 적용한 팔당호 인근 양평의 기온 변화 추세는 지난 47년간(1973~2019) 증가(0.048 ℃/yr)에 비하여 최근 27년간(1993~2019) 기온의 증가(0.060 ℃/yr)가 컸다. 팔당호와 유입 하천에서 수온은 기온과의 상관성이 높으나(R > 0.9, p < 0.005) 호소인 팔당댐앞 지점에서의 수온은 하천 수온 상승에 비하여 느리고 기온 하강기에 들어서 수온이 서서히 감소하였고 수심 평균 수온도 상승기와 하강기 모두 호소 표층보다 변화가 더디게 나타났다. 이는 호소가 하천보다 수체 규모 면에서 크고 체류시간이 길기 때문에 열에너지를 흡수하고 감소하는데 시간이 걸리는 수온의 이력 현상이 크게 작용하는 것으로 판단된다.

Keywords

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