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이대인 ( Lee Dae In ),조현서 ( Jo Hyeon Seo ),이문옥 ( Lee Mun Og ) 한국환경영향평가학회 2003 환경영향평가 Vol.12 No.5
Seasonal characteristics of water quality and effect of the freshwater discharge during open the tide embankment in Haechang Bay were evaluated. In the freshwater, where interior of the tide embankment, COD and Chl-a exceeded about 4㎎/L and 10㎎/㎥, respectively, independent of season, while in the seawater they showed high values in April and July in contrast to the other period due to input of freshwater and increase of phytoplankton, reswvely. The content of seawater inorganic nitrogen maintained a relatively high level at inner part of the bay, whereas high values of inorganic phosphorus content was distributed at all over the bay. The limiting factor for algal growth was nitrogen with respect to the N/P ratio. The compass of influence by the freshwater discharge in April was quite different with water pollutants. As a result of the salinity variation with time, the freshwater extended strongly to offshore from the surface layer without mixing with depth when open the tide embankment, and reached within about one hour at a station which is 3.5km from the tide embankment. To effective water quality management of Haechang Bay, discharge rate and pollutant loads should be controlled.
진해만 서부해역의 하계 환경특성 연구 -수질 및 저질의 공간적 변동-
이대인 ( Lee Dae In ),조현서 ( Jo Hyeon Seo ),이문옥 ( Lee Mun Og ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.6
A study on the pollution level and spatial characteristics of water quality and sediment environment of the western Chinhae Bay in summer that is famous for shellfish culture grounds was carried out August 1999. Dissolved oxygen was hypersaturated at surface layer resulting from photosynthesis by phytoplankton, but oxygen deficiency or anoxic water mass by bulk decomposion of organic matters appeared at bottom layer. Chemical oxygen demand exceeded seawater quality criteria Ⅱ, and dissolved form was dominated in organic carbon, Inorganic nitrogen and phosphorus in surface layer were relatively low compared to the bottom layer due to uptake of phytoplankton. By Redfield ratio, the limiting factor for algal growth was nitrogen. The range of Chl. a was 4.83-24.94㎎/㎡. The Chl. a in inner bay and the west part of Kajodo represented very high valures that exceeded possibility concentration of red tide outbreak. H₂S and COD values in sediment were very hi9호. This means that sediment was severely poluted by organic matters. In summary, the organic matters caused by aquatic organisms in water column exist in abundance, which increase nutrients by remineralization of sinking organics. Dissolved oxygen is rapidly consumed, and ultimately sediment environment is getting worse. This situation is more serious in the west part of Kajodo. For water quality management, effective countermeasures such as appropriate aquaculture density by estimation of carrying capacity and reduction of pollutants from polluted sediment are necessary.