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** Marine Environmental Impact Assessment Center, National Fisheries Research & Development Institute, Busan, 619-705, Korea  :            5(2008∼2012)     .    ·  7( EEZ,  EEZ,  EEZ  ,   ,   ,    2)    2(EEZs      1)         .   ,             . , , , ,                 .       ,                   .      , ,               ,        .  : , ,  , , ,  Abstract : We reviewed investigation status on turbidity plume in the statement of marine environmental survey(2008 to 2012) associated with marine sand extraction projects. The survey statement from seven marine sand extraction sites (extraction area of Southern EEZ, extraction area of Western EEZ, relocation zone in the Western EEZ, sea area under jurisdiction of Taean-gun, sea area under jurisdiction of Ansan City, and two discrete sea areas under jurisdiction of Ongjin-gun) in the nearshore and offshore of Korea showed that in situ observations were carried out for the dispersion and transport of suspended sediments on two areas (One is a extraction area in the EEZs, the other is an area of coastal sites). However, sampling station and range have not been selected considering physical, geographical factors (tide, wave, stratification, water depth, etc.) and weather conditions (wind direction and velocity, fetch, duration, etc). Especially turbidity plumes originating from three sources, which include suspended sediments in overflow(or overspill) discharged from spillways and reject chutes of dredging vessel, and resuspended sediments from draghead at the seabed, may be transported to a far greater distance outside the boundary of the extraction site and have undesirable impacts on the marine environment and ecosystem. We address that behaviour of environmental pollutants such as suspended solids, nutrients, and metals should be extensively monitored and diagnosed during the dispersion and transport of the plume. Finally we suggest the necessity to supplement the current system of the sea area utilization consultation and establish the combined guidelines on marine sand extraction to collect basic data, to monitor cumulative effects, and to minimize environmental damages incurred by the aftermath of sand extraction.Key Words : Turbidity plume, Statement of marine environmental survey, Marine sand extraction, Suspended sediments, Overflow, Cumulative effects

Improvements in the Marine Environmental Survey on Impact of Seawater Qualities and Ecosystems due to Marine Sand Mining