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Seasonal characteristics of thermal and chemical stratification in Lake Paldang

팔당호의 계절별 열적 및 화학적 층화 특성

  • Son, Ju Yeon (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Park, Jin Rak (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Noh, Hye Ran (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Yu, Soon Ju (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Im, Jong Kwon (Han River Environment Research Center, National Institute of Environmental Research)
  • 손주연 (국립환경과학원 한강물환경연구소) ;
  • 박진락 (국립환경과학원 한강물환경연구소) ;
  • 노혜란 (국립환경과학원 한강물환경연구소) ;
  • 유순주 (국립환경과학원 한강물환경연구소) ;
  • 임종권 (국립환경과학원 한강물환경연구소)
  • Received : 2019.10.08
  • Accepted : 2020.01.03
  • Published : 2020.01.30

Abstract

The purpose of this study was to investigate the thermal and chemical stratification in Lake Paldang 2013-2018 weekly using Schmidt's stability index (SSI) and the index of chemical stratification (IC-i). The annual average for SSI was 19.1 g cm/㎠ with the maximum value of 45.3 g cm/㎠ in the summer and the minimum value of 4.8 g cm/㎠ in fall-winter showing seasonal differences as well as increased vertical mixing in the summer. The lake stability increased higher in 2016 as compared with the other period. The most influential factors of thermal stratification were temperature and heavy rainfall. Especially, high water temperature and a prolonged residence duration caused by reduced rainfall and inflows could result in an increase of the stratification period. While decreasing inflow and outflow at the end of the rainfall, the thermal stratification was restrengthened within 7-14 days, and then stabilized rapidly before the rainfall. IC-DO increased with high air temperature in the spring and fall-winter. However increasing sunshine duration and residence time and decreasing rate of outflow caused an increase of IC-DO in the summer. Rainfall (less than 800 mm/year) and discharge (less than 200 CMS) significantly declined in 2015 resulting in IC-DO (0.77) increased more than three times over the other years and bottom water hypoxia occurred. The SSI and IC-i used in this study could be applied to other lakes to understand changes in stratification and mixing dynamics.

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