만경강 하구역의 유기탄소 거동 및 분포 KCI

Title
만경강 하구역의 유기탄소 거동 및 분포
Alternative Title
Organic carbon behavior and distribution in the MankyoungRiver Estuary
Author(s)
박준건; 김은수; 김경태; 조성록; 박용철
KIOST Author(s)
Kim, Kyung Tae(김경태)Cho, Sung Rok(조성록)
Publication Year
2006-08
Abstract
만경강 하구역의 입자성 부유물질 및 유기탄소 거동에 관한 연구가 2003년 2월, 5월, 7월, 8월에 이루어졌다. 갈수기인 2, 5월과 풍수기인 7, 8월에 만경강을 통한 담수 유입량의 차이는 매우 컸으며, 용존유기탄소의 유입량은 갈수기와 풍수기에 각각 약 8.16×102tonC month−1와 5.77×103tonC month−1, 입자성유기탄소의 유입량은 갈수기와 풍수기 각각 약 9.37×102tonC month−1와 3.14×104tonC month−1로 나타났다. 특히 많은 강우가 집중되었던 풍수기에 방조제 내 북측 수역의 용존유기탄소 농도가 증가하는 경향을 보였다. 조사기간 중 만경강 하구역에서의 용존유기탄소 분포는 염분에 대해 비교적 보존적인 특성을 보이고 있어, 담수와 해수사이의 물리적 희석작용에 영향을 많이 받는 것으로 나타났다. 그러나 입자성유기탄소의 분포는 부유물질의 거동과 유사하게 60-90% 정도가 하구역에 침강, 제거되는 것으로 나타났다. 이러한 결과로 볼 때 새만금 방조제 완공 후 만경강 하구역이 외해와의 물질 교환이 차단 될 경우, 저층에 퇴적된 다량의 유기 탄소가 저층 용존 산소 고갈의 주요 원인이 될 수 있음을 시사하고 있다.

Suspended particulate matter and organic carbon were measured in the Mankyoung river estuary in February, May, July and August 2003. There was a large variance in river discharge between the dry season of February and May and the wet season of July and August. The influx of dissolved organic carbon into the estuary was 8.16×102tonC month−1 in the dry season and 5.77×103tonC month−1 in the wet season. The influx of particulate organic carbon was 9.37×102tonC month−1 and 3.14×104tonC month−1 in the dry and wet seasons, respectively. Especially, dissolved organic carbon in the northern part of the site inside the dike was increased in July when torrential rainfall was high. In the research, the distribution of dissolved organic carbon showed conservative behavior with the salinity gradient in the estuary, suggesting that physical mixing between seawater and freshwater dominates the distribution pattern of the dissolved organic carbon in the system. However 60 to 90% of the particulate organic carbon introduced into the estuary was removed from the surface water at the upper estuarine mixing zone of low salinities, showing non-conservative behavior similar with suspended particulate matter. The completion of the Saemangum Dike is likely to inhibit the exchange of materials between open sea and the Mankyoung estuary. This suggests that the oxidation of organic carbon in the bottom of the estuary may exhaust dissolved oxygen in the confined environment.
ISSN
2288-0089
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4857
Bibliographic Citation
한국해양환경•에너지학회지, v.9, no.3, pp.131 - 140, 2006
Publisher
한국해양환경·에너지학회
Keywords
용존유기탄소; 입자성유기탄소; 새만금; 만경강 하구; Dissolved organic carbon; Particulate organic carbon; Saemanguem; Mankyoung river estuary
Type
Article
Publisher
한국해양환경·에너지학회
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