Temporal-spatial variations of water quality of Gyeonggi Bay, West Coast of Korea, and their controlling factor SCOPUS KCI

Title
Temporal-spatial variations of water quality of Gyeonggi Bay, West Coast of Korea, and their controlling factor
Author(s)
Lim, D.-I.; Rho, K.C.; Jang, P.G.; Kang, S.M.; Jung, H.-S.; Jung, R.H.; Lee, W.C.
KIOST Author(s)
Lim, Dhongil(임동일)Jang, Pung Guk(장풍국)Jung, Hoi Soo(정회수)
Publication Year
2007
Abstract
Temporal (seasonal) and spatial distributions and variations of various physico-chemical factors (salinity, temperature, pH, DO, COD, SPM, POC, silicate, DIP, DIN) in surface and bottom waters were studied in the coastal environment with typical macro-tidal range and monsoonal weather condition, Gyeonggi Bay, west coast of Korea. Spacial distribution patterns of these factors were generally similar to each other, and appeared to be inversely related to the distribution pattern of salinity, suggesting that water quality of the study area was primarily controlled by the physical mixing process of Han-River freshwater with nearby coastal seawater. During flooding season, silicate- and nitrogen-rich Han River water directly flowed into offshore as far as 20-30 km from the river mouth, probably causing serious environmental problems such as eutrophication and unusual and/or noxious algal bloom, etc. Except the surface water during summer flooding season, high concentrations of nutrients appeared generally in dry season, whereas low values in spring, possibly because of the occurrence of spring phytoplankton bloom. On the other hand, nutrient flux through the estuary seems to be primarily depending on river discharge, sewage discharge and agricultural activities, especially during the rainy season. Also, nutrients in this coastal waters are considered to be supplied from the sediments of tidal-flats, which developed extensively around the Han-River mouth, especially during fall and winter of dry and low discharge seasons, possibly due to the stirring of tidal flat sediments with highly enriched pore-water nutrients by storm. And also, COD and DIN concentrations in the study area consistently increased during the last 20 years probably because of agricultural activities and increasing discharge of industrial and domestic wastes.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4760
DOI
10.4217/OPR.2007.29.2.135
Bibliographic Citation
Ocean and Polar Research, v.29, no.2, pp.135 - 153, 2007
Publisher
Korea Ocean Research and Development Institute
Subject
coastal zone; nutrient; physicochemical property; river discharge; seawater; sewage disposal; spatial distribution; tidal flat; water quality; Asia; Eurasia; Far East; Gyeonggi Bay; Han River [South Korea]; Korea; South Korea; algae
Keywords
Eutrophication; Gyeonggi Bay coastal area; Nutrients; Temporal-spatial variation
Type
Article
Language
Korean
Document Type
Article
Publisher
Korea Ocean Research and Development Institute
Related Researcher
Research Interests

Marine Geochemistry,Paleoceanography,Marine Pollution,해양지화학,고해양학,해양오염학

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