Summer Water Quality Management by Ecological Modelling in Ulsan Bay

생태계 모델을 이용한 울산만의 하계 수질관리

  • Park, Sung-Eun (Division of Environmental Research, National Fisheries Research & Development Institute) ;
  • Hong, Sok-Jin (Division of Environmental Research, National Fisheries Research & Development Institute) ;
  • Lee, Won-Chan (Division of Environmental Research, National Fisheries Research & Development Institute) ;
  • Jung, Rae-Hong (Division of Environmental Research, National Fisheries Research & Development Institute) ;
  • Cho, Yoon-Sik (Division of Environmental Research, National Fisheries Research & Development Institute) ;
  • Kim, Hyung-Chul (Division of Environmental Research, National Fisheries Research & Development Institute) ;
  • Kim, Dong-Myung (Ecological Engineering, Pukyung National University)
  • 박성은 (국립수산과학원 환경연구과) ;
  • 홍석진 (국립수산과학원 환경연구과) ;
  • 이원찬 (국립수산과학원 환경연구과) ;
  • 정래홍 (국립수산과학원 환경연구과) ;
  • 조윤식 (국립수산과학원 환경연구과) ;
  • 김형철 (국립수산과학원 환경연구과) ;
  • 김동명 (부경대학교 생태공학과)
  • Received : 2009.12.07
  • Accepted : 2010.03.24
  • Published : 2010.03.31

Abstract

Numerical study on coastal water quality management was conducted to examine the response of summer water quality to the flow into the sea of land based pollution load in Ulsan Bay, Korea The abatement of pollution load. from point sources of land was estimated on the basis of Korean coastal water quality standard using an ecosystem model. The results of the ecological model simulation showed that COD values in the inner part of the bay were greater than 280mg/L, and exceeded the grade III limit of Korean coastal water quality standard 30% of all land based pollution loads or organic and inorganic material loads from point sources should be cut down to keep the COD levels below 2mg/L. As environmental carrying capacity was estimated to be 7,193kgCOD/day to keep the COD levels below 2mg/L in Ulsan Bay, 3,083kgCOD/day of land based organic loads should be reduced. The phytoplankton blooms have occurred in the Teahwa river mouth or estuary repetitively, so it is important to control land based nutrients loads for removal of autochthonous organic loads around Ulsan Bay.

울산만의 육상기인 오염부하에 대한 해역수질의 응답특성을 조사하고 만내 수질관리에 활용하기 위하여 해양생태계모델링 연구를 수행하였다. 생태계모텔에 의해 계산된 울산만의 수질은 만 내측에서 COD 농도 2.8mg/L로 해양수질 III등급 수준으로 나타났다. 계산결과 울산만 전체 해역의 수질을 II등급으로 개선하기 위해서는 육상부하를 약 30% 이상 삭감해야 하며, COD 농도 1.0mg/L이하의 수질이 되기 위해서는 전체 육상부하의 70% 이상을 삭감해야 하는 것으로 나타났다. 해역수질 II등급을 유지하기 위하여 삭감해야 할 오염부하량은 약 3,083kgCOD/day, 이 때의 환경용량은 약 7,193kgCOD/day로 계산되었다. 태화강 하구역은 식물플랑크톤 대증식(Bloom)이 상습적으로 발생하는 해역이므로 식물플랑크톤에 의한 자생유기물 부하를 감소시키기 위해서는 유가물 삭감 이외에도 영양염의 제어가 필요한 것으로 나타났다.

Keywords

References

  1. 국토해양부(2005), 해양환경공정시험방법, p. 314.
  2. 국토해양부(2008), 해역환경관리 기본계획수립연구(울산만특별관리해역), p. 334.
  3. 국립해양조사원(2002), 수로기술연보, p.423.
  4. 김광수(1998), 생태계모델을 이용한 울산만의 수질 시뮬레이션, 한국항만공학회지, 제12권 2호, pp. 1-9.
  5. 김광수, 김동명, 박청길(1999), 해수유동모델을 이용한 황해 환경용량의 개략 산정, Journal of the Korean Society for Marine Environmental Engineering Vol. 2, No. 1, pp. 63-73.
  6. 김광수, 박청길, 조은일(1996), 생태계 모델을 이용한 황해의 환경용량 산정, Journal of Korean Society on Water Quality Vol. 12, No. 4, pp. 383-399.
  7. 홍석진, 이원찬, 정래홍, 오현택, 장주형, 구준호, 김동명 (2007), 2003년 하계 진해만 수질 개선을 위한 생태계 모델링, 해양환경안전학회지, 제13권, 제2호, pp. 103-110.
  8. Blumberg, A. F. and G. L. Mellor(1987). "A description of a three-dimensional coastal ocean circulation model." In: N. Heaps, Editor, Three-Dimensional Coastal Ocean Models, American Geophysical Union, p. 208.
  9. Lung, W. S.(1988), The role of estuarine modeling in nutrient control. Water Science and Technology Vol. 20, pp. 243-252.
  10. Mark, D. J. and B. W. Bunch(1992), Hydrodynamic and water quality modeling of Lower Green Bay. Estuarine and coastal modeling, In: Proceedings of the Second International Conference, ASCE 1992, pp. 657-668.
  11. Oey, L. Y. and G. L. Mellor(1993). "Subtidal variability of estuarine outflow, plume, and coastal current: a model study", Journal of Physical Oceanography. Vol 23, pp. 164-171. https://doi.org/10.1175/1520-0485(1993)023<0164:SVOEOP>2.0.CO;2
  12. Takeoka, H. and H. Murao(1997), Response of water quality to the reduction of nitrogen or phosphorus load from the land. Bulletin on Coastal Oceanography Vol. 34, pp. 183-190.
  13. Takeshi, H.(1988), The role of modelling in the control of seawater pollution. Water Science and Technology Vol. 20, pp. 277-286.