Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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Environmental Characteristics of Seawater and Sediment in Mariculture Management Area in Ongjin-gun, Korea

옹진군 어장관리해역의 수질 및 퇴적물 환경 특성

  • Kim, Sun-Young (Marine Environment Research Division, National Fisheries Research and Development Institute) ;
  • Kim, Hyung-Chul (Marine Environment Research Division, National Fisheries Research and Development Institute) ;
  • Lee, Won-Chan (Marine Environment Research Division, National Fisheries Research and Development Institute) ;
  • Hwang, Dong-Woon (Marine Environment Research Division, National Fisheries Research and Development Institute) ;
  • Hong, Sok-Jin (Marine Environment Research Division, National Fisheries Research and Development Institute) ;
  • Kim, Jeong-Bae (Marine Environment Research Division, National Fisheries Research and Development Institute) ;
  • Cho, Yoon-Sik (Marine Environment Research Division, National Fisheries Research and Development Institute) ;
  • Kim, Chung-Sook (Marine Environment Research Division, National Fisheries Research and Development Institute)
  • 김선영 (국립수산과학원 어장환경과) ;
  • 김형철 (국립수산과학원 어장환경과) ;
  • 이원찬 (국립수산과학원 어장환경과) ;
  • 황동운 (국립수산과학원 어장환경과) ;
  • 홍석진 (국립수산과학원 어장환경과) ;
  • 김정배 (국립수산과학원 어장환경과) ;
  • 조윤식 (국립수산과학원 어장환경과) ;
  • 김청숙 (국립수산과학원 어장환경과)
  • Received : 2013.10.15
  • Accepted : 2013.12.26
  • Published : 2013.12.31
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Abstract

To improve productivity of aquaculture animals with management of culturing grounds, survey of mariculture management area in Ongjin-gun about water quality and sedimentary environment had been conducted on June, August and November in 2011. Water temperature in surface and bottom waters ranged from 9.49 to $24.14^{\circ}C$. Salinity and dissolved oxygen concentrations were in the range of 23.19~31.49 and 5.48~9.36 mg/L, respectively, depending on the variation of water temperature. The average concentration of COD was 1.57 mg/L and the concentrations of DIN and DIP showed entirely low level. As the result of grain size analysis, sand(56.66 %) and silt(34.60 %) were predominated. The Mz of sediment showed a variation of 2.59 to $6.62{\O}$ and sorting appeared to be poorly sorted. The concentrations of COD and IL in surface sediment ranged from 1.00 to $11.03mg/g{\cdot}dry$ and 0.72 to 5.29 %, respectively, which showed relatively good positive correlations. On the environmental assessment of trace metals in surface sediment, geoaccumulation index ($I_{geo}$) class indicated that sediments were not contaminated by most of metallic elements except Cr and As. Our result implies that this study area showed good water quality and sediments were not polluted by organic matters and metallic elements.

어장관리해역으로 지정된 옹진군의 수질 및 퇴적물 환경 특성을 파악하기 위하여 2011년에 4개 도서(장봉도, 자월도, 영흥도, 백령도)를 대상으로 조사를 실시하였다. 수온은 $9.49{\sim}24.14^{\circ}C$로 계절변동 특성을 잘 나타내었고, 염분(23.19~31.49)과 용존산소(5.48~9.36 mg/L)는 수온과 역상관성을 보였으며, 화학적산소요구량(COD)은 평균 1.57 mg/L로 전체적으로 양호한 수준이었다. DIN과 DIP는 각각 0.111~0.666 mg/L, 0.002~0.043 mg/L의 범위로 전 정점에서 낮은 분포를 보였고, 엽록소 a의 농도는 $0.02{\sim}8.07{\mu}g/L$ 범위로 서해의 다른 해역보다 낮았다. 퇴적물의 입도 분포는 모래와 실트가 각각 56.7 %, 34.6 %로 우세하였고, 분급은 불량하였다. 퇴적물의 화학적산소요구량과 강열감량은 각각 $1.00{\sim}11.03mg/g{\cdot}dry$, 0.72~5.29 %의 범위로 시 공간적으로 유사한 경향을 보였다. 총유기탄소와 총질소의 C/N ratio는 8.17~17.97 범위로 하계에 육상기원과 해양기원에 의한 영향이 혼재하는 것으로 나타났다. 표층퇴적물의 미량금속 오염도 평가를 위해 농집지수($I_{geo}$)를 계산한 결과, Cr과 As를 제외한 나머지 금속원소에 의한 오염은 없는 것으로 판단된다. 이러한 연구 결과는 본 연구지역이 전체적으로 양호한 수질을 보이며, 유기물과 금속원소에 의한 표층퇴적물의 오염이 없다는 것을 보여준다.

Keywords

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