Journal of Environmental Impact Assessment 2023 KCI Impact Factor : 0.51
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pISSN : 1225-7184
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Effect of Air Temperature Changes on Water Temperature and Hysteresis Phenomenon in Lake Paldang
- Journal of Environmental Impact Assessment
- Abbr : J EIA
- 2020, 29(5), pp.323-337
- Publisher : Korean Society Of Environmental Impact Assessment
- Research Area : Engineering > Environmental Engineering
- Received : July 17, 2020
- Accepted : September 21, 2020
- Published : October 31, 2020
Soonju Yu 1, Jong-Kwon Im 1, Lee Bo-Mi 1
1국립환경과학원 한강물환경연구소
Accredited
ABSTRACT
Long-term continuous data were used to investigate changes in air and watertemperature 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 overthe last 27 years (0.060°C/yr, 1993-2019) was higher than that of during 47 years (0.048°C/yr, 1973-2019). The air and watertemperatures in Lake Paldang and its influent rivers had a high correlation (R > 0.9, p < 0.005); however, the water temperature increased atrate slowerthan the river watertemperature, and the watertemperature 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.
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