• Ocean and Polar Research
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• 제22권2호
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• pp.69-80
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• 2000

A 3-D particle tracking model with normalized characteristic equations has been developed to predict the variation of near-field mixing characteristics and the far-field transport of the effluent plumes discharged from sea outfalls. The model was applied to the case study on the Masan sea outfall plumes discharged through a submerged multiport-diffuser. Numerical simulations of the effluent transport for 15 days which cover neap and spring tidal cycles in Masan Bay were conducted using fall velocities of the solid wastes and the initial plume characteristics obtained from normalized near-field characteristic equations. The results showed that time variations in near-field minimum dilutions with tidal ambient flow conditions are about $45{\sim}49$. Most of the heavy particles in the effluent plumes were settled and deposited in the vicinity of the outfalls immediately, and the finer particles were transported eastwards 3 km away from the outfalls for 15 days. A similar depositional trend of contaminated sediment was also found during a recent field survey.

• 한국해양환경ㆍ에너지학회지
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• 제3권1호
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• pp.35-44
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• 2000

1999년 2월에 관측한 수온 및 염분도 분포로부터 마산ㆍ창원 하수종말처리장의 해양 수중방류수에 대한 동계의 근역희석률을 산정하였다. 소조기의 약한 주변유속과 수온약층에 의해 하수플륨이 포착되어 희석률이 30～40정도로 저조했던 하계의 경우와는 달리 동계 소조기의 경우에는 주변해수의 수직적 등밀도혼합이 전 층에서 형성되어 하수플륨이 수표면까지 상승하며 희석률도 90～130정도로 훨씬 큰 것으로 나타났다. CORMIX2 모형의 모의결과에서도 소조기의 약한 유속(Ua=6.0cm/s)의 경우 동계 희석률이 하계 희석률보다 약 3배 정도 증가하였으며 대조기의 강한 유속(Ua=15.5cm/s)의 경우에는 두 계절의 희석률 차이가 30%정도로 미미하였다. 이는 수중방류 하수의 근역희석 및 혼합과정이 주변해수의 밀도성층 효과보다는 유동성분에 더 큰 영향을 받기 때문인 것으로 사료된다.

• 한국해안해양공학회지
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• 제12권2호
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• pp.53-69
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• 2000

수중다공확산관을 통해 1차 처리수를 마산만에 방류하고 있는 마산·창원 하수종말처리장의 증설계획에 따른 하수방류량의 증가시 현재의 해양방류시설을 그대로 사용하였을 경우 방류하수의 희석률 변화를 예측하였다 하수처리시설 증설후 방류량의 증가에 따라 희석률은 큰 폭으로 감소하였다 이에 대한 개선방안 도출을 위해 현 위치에서 확산관의 배치와 길이를 변경해서 희석률의 개선효과를 CORMIX 모형을 사용하여 조사하였다. 확산관의 길이가 연장되고 확산관축을 해류방향에 대해 평행보다는 직각이 되게 배치했을 경우 희석률은 다소 증가하였으나 소조기의 약한 해류에서는 희석률의 변화가 거의 없어 현위치에서의 한계성을 보였다 하수처리장의 2단계와 3단계의 증설에 대비한 새로운 방류위치선정과 확산관의 최적배치로 희석률을 크게 높일수 있는 대안을 모형 모의 결과로부터 제시하였다.

• 한국수산과학회지
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• 제55권6호
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• pp.954-959
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• 2022

Marine outfalls are used to discharge treated liquid effluents to the environment. An efficiently designed, constructed and operated marine outfall effectively dilutes the discharged effluent, thereby reducing the risk to biota and humans dependent upon the marine environment. In this study, we investigated the effluent transport from a marine outfall at different depths in Masan Bay. A particle-tracking model was used to predict the dispersion of effluent. The model results indicate that some particles released from a depth of 13 m move to the inner area of Masan Bay within 48 h. As the release depth increases after 48 h, the particles move further southward. This suggests that effluent from the outer area of Masan Bay can affect the inner area, and that this effect can be reduced by increasing the depth of effluent release.

• Fisheries and Aquatic Sciences
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• 제13권3호
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• pp.236-243
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• 2010

Fecal sterols, nonylphenolic compounds (NPs), and polycyclic aromatic hydrocarbons (PAHs) were determined in surface water from Masan Bay and its adjacent rivers in February 2005. Concentrations of coporstanol (Cop), an indicator of fecal pollution, in surface water ranged from <10 to 13,853 ng/L, and concentrations of nonylphenol, the most toxic of the NPs, ranged from 10.2 to 481 ng/L, and concentrations of PAHs ranged from 8.61 to 223 ng/L. The concentrations of the compounds measured in this study were lower than or comparable to those at other locations in Korea and other countries. The contamination of Cop and PAHs in surface water was associated with the discharge from rivers passing through cities and/or industrial complexes. The NP contamination was associated with wastewater treatment plant (WWTP) effluents through outfalls as well as riverine discharge. Compared to ecotoxicological values, the concentrations of NPs from rivers, the mouths of rivers, and WWTP outfall areas exceeded guidelines, suggesting that hot spot areas may pose a potential risk to sensitive species.