| Title |
A Study on the Environmental Characteristics of the Western Chinhae Bay in Summer -Spatial Variation of Water Quality in Water Column and Sediment Environment- |
| Authors |
이대인 ( Lee Dae In ) ; 조현서 ( Jo Hyeon Seo ) ; 이문옥 ( Lee Mun Og ) |
| Keywords |
Water Quality; Sediment; The Western Chinhae Bay; Organic Matter; Water Quality Management |
| Abstract |
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. |