남해 EEZ 골재채취 해역의 부유사 발생 및 확산 특성

다국어 초록 (Multilingual Abstract)

To understand the characteristics of the suspended sediment (SS) generation and dispersion patterns during dredging operation around the EEZ sand mining zone in southern sea of Korea, the previous survey results about the overflow SS as well the SS tracking from 2013 to 2016, and the satellite images were collected and analyzed. The concentration of SS flowing out to the sea surface during dredging was 656-36,094 mg/L, and this concentration increased as the dredging capacity increased. According to the spreading pattern of SS by SS tracking survey results and satellite image data (GOCI), most of SS plumes headed northeast in the direction of ebb due to the influence of Tsushima Warm Current (TWC). A relatively high concentration was observed in the surface layer near the dredging vessels due to the out flowing of SS to the sea surface, and far away from the dredging area, the concentrations in the surface, middle, and low layers became similar. When the influence of TWC was weakened during flood at spring tide, SS plumes headed west following the direction of flood, and the high concentration range was increased. According to the overlapping results of satellite image data (GOCI), SS spreaded up to 58 km northeast during the dredging process. Since the characteristics of the SS generation and dispersion patterns depend on the dredging condition, as well as the specific ocean current and wind circumstances in the area, therefore in order to minimizing the environmental impacts caused by dredging, it is necessary to review the mitigation of dredging capacity and appropriate operation timing.

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