봄 조석에 따른 한국서남해역 수도수로 주변해역의 수질 및 표층퇴적물의 환경특성

An environmental characteristics on the water quality and surface sediments at spring and neap tides in Sudo Strait, West-southern Sea of Korea, spring 2005.

We carried out a study for the water quality, such as water temperature, salinity, density, extinction coefficient (EC), dissolved oxygen (DO), suspended solied (SS), chemical oxygen demand (COD), dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP), N/P ratio, silicate and chlorophyll a, and the distribution of organic matter in surface sediments, such as ignition loss (IL), acid volatile sulfide (AVS), CODs in the Sudo strait of west-southern parts of Korean peninsula during early spring 2005. Water temperature and salinity showed a well mixing water types. And according to the analysis of a T-S diagram, three characteristics of water types were identified. EC and SS showed a wide range 1.25-6.86 and 46.0~362.7 ㎎/L. EC was above 3 from almost all area except in the some northern parts. Especially, SS in surface water showed very high value with mean 112.4 ㎎/L in the neap tide and 172.8 ㎎/L in the spring tide. DIN fluctuated between 2.58 μM with the lowest mean 9.78 μM in surface water of spring tide and 22.74 μM with the highest mean 14.71 μM in bottom of neap tide. DIP was from 0.37 μM in spring tide to 0.79 μM in neap tide. N/P ratio showed the lowest mean value of 17.0 in surface water of spring tide within the range of 3.8~25.2, while it showed the highest mean value of 20.7 in surface water of neap tide within the range of 16.7~25.5. And chlorophyll a concentration was from low value of 1.61 ㎍/L in spring tide to high value of 7.50 ㎍/L in neap tide. As a results of the distribution of organic matter on surface sediments, the range of IL appeared from 2.91% to 8.92% with mean value of 5.07%. CODs showed the mean value of 15.96 ㎎/g dry within the range of 2.13~37.19 ㎎/g dry. And the range of AVS(H2S) was from no detect(ND) to 0.16 ㎎/g dry with mean value of 0.13 ㎎/g dry. The biological marine environmental characteristics in Sudo straits of west-southern parts of Korean peninsula was characterized by high concentration of nutrients influenced by animal waste, and very high values of SS and extinction coefficients by well mixing type. Therefore, the primary productivity in Sudo straits may be controlled by the irradiance.