시화호 수질의 연변화 양상에 대한 연구 SCOPUS KCI

Title
시화호 수질의 연변화 양상에 대한 연구
Alternative Title
Annual Variation of Water Qualities in the Sihwa Lake
Author(s)
박준건; 김은수; 조성록; 김경태; 박용철
KIOST Author(s)
Cho, Sung Rok(조성록)Kim, Kyung Tae(김경태)
Publication Year
2003-12
Abstract
Annual variation of water qualities in the Sihwa Lake were observed 18 times from June 1996 to October 2001. We studied at the station of the upper streams and near the water gate of lake. After the flow of the outer seawater through the water gate, the surface salinity in Sihwa Lake increased to the range of 25-30 psu in both stations after October 1998. Due to the declination of the salinity differences between the surface and the bottom water, the pycnocline in which had existed until 1997 has weakened, and made the water column mix vertically. This led to the improvement of anoxic/hypoxic environment at bottom waters after April 1998. However, despite the continuous flow of the outer seawater, the concentrations of chlorophyll-a at surface layer were varied from 2 g/l to 60 g/l, and these values indicated the eutrophication. The following organic matter load was greatly influencing the surface layer's COD concentration. During the rainy season, the salinity at the surface layer fell below 15 psu resulting in stratification between the surface and bottom layer. Organic matters that were provided from the surface layer to the bottom layer due to active primary production in the year exhausted dissolved oxygen at the bottom layer, and the bulks of organic matters at bottom gave rise to hypoxic or anoxic environment. It was observed that the enrichment of ammonia and phosphate were main factors to worsen the water quality of the Sihwa Lake. The results of examining the annual variations in Sihwa Lake through principal component analysis shown that water characteristics in the rainy season were similar with those before input of outer sea water.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5404
Bibliographic Citation
Ocean and Polar Research, v.25, no.4, pp.459 - 468, 2003
Publisher
한국해양과학기술원
Keywords
시화호; 수질; 부영양화; 성층화; 무산소/저산소; Sihwa Lake; water quality; eutrophication; stratification; anoxic/hypoxic
Type
Article
Publisher
한국해양과학기술원
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