팔당호의 계절별 열적 및 화학적 층화 특성

• Published in: 한국물환경학회지 Vol. 36; no. 1; pp. 1 - 13
• Main Authors: 손주연, 박진락, 노혜란, 유순주, 임종권, Son, Ju Yeon, Park, Jin Rak, Noh, Hye Ran, Yu, Soon Ju, Im, Jong Kwon
• Format: Journal Article
• Language: Korean
• Published: 한국물환경학회 01.01.2020
• Subjects: 환경공학; Chemical stratification; Mixing processes; Vertical Profiling; Thermal stratification; Lake stability; Lake dynamics
• ISSN: 2289-0971; 2289-098X
• DOI: 10.15681/KSWE.2020.36.1.1

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.