• Journal of Navigation and Port Research
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• v.37 no.6
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• pp.637-645
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• 2013

Masan bay with a semi-enclosed waters has serious water quality problems due to the low flow and river pollution load from land, and shows the vulnerable locational characteristics to storm surge. We are seeking the way of both operating disaster prevention facilities and water quality improvement measures in the bay. That is, the water was exchanged using the head difference occurred by operating disaster prevention facilities. The location of disaster prevention facilities was assumed to be in the inlet of the bay, in the vicinity of Machang bridge, and in the vicinity of Dot island and the operation time was assumed to be early morning hours(01~05) considering the number of shipping passage and annual tide, and spring tide of the largest head difference. In addition, the experiment case of water exchange including the in-outflow feeder pipe was tested. According to the simulation results, water exchange rate in all experiments has shown a steady increase. Water exchange rate of the whole of Masan bay in the case of present is 38.62%. The water exchange rate of the inside of Masan bay compared with the inlet of bay, appeared to be very low. Thus, we judged that the characteristics of semi-enclosed waters were well reproduced. On the results of the experiment of disaster prevention facilities and in-outflow feeder pipe, the case of the operation of disaster prevention facilities, water exchage rate is high compared with the case of present. And, the higer the operating frequency, the more water exchange is appeared. The cases of water exchange prevention facilities through the in-outflow feeder pipe caused by the head difference, also showed the higest improvement of the water quality. Compared with the south of Machang bridge, the effect of water exchange was better in the inlet of Masan bay and Dot island. On the other hand, the inlet of Masan bay is higer than Dot island as for water exchange of the whole of Masan bay, but opposite, water change rate including Masan inside was higher in the case of Dot island.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2003.05a
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• pp.165-170
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• 2003

Due to the impermeability of outer wall facilities such a Breakwaters which dissipates the wave energy and keeps harbor tranquility, the water exchange can be worse and increased enclosed at the harbor. Recent trends of port development protect water quality and emphasize Water-Front, so the method which enhances the circulation of harbor waters and the dilution of the water pollutants are studied. The best improvement of water quality is a remove of pollutant source on land, but an enclosed port must be enhanced the tidal exchange. To this hence, the best improvement may be made on drain-route on the existing outer wall facilities. In this study, the numerical computations were carried out to predict the circulation of harbor waters and the tidal exchange in the polluted harbor(Samchonpo-guhang) located at the east coast of South Sea. Computational models adopting FDM(Finite Difference Method) were used here and were already verified from the previous studies and ocean survey. As a result of this study, the tidal exchange in Samchonpo-guhang before and after installation of drain-route is assessed.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.19 no.4
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• pp.385-398
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• 2007

It was analysed that spatial and temporal change patterns of general water quality constituents were measured monthly from 2002 to 2005 in Jumunjin Harbour. The measured constituents are temperature, salinity, pH, SS and DO. Concentration difference of upper lower layer for general water quality constituents was small. Temperature and DO concentration show the clear difference at temporal concentration change pattern, but SS, pH and salinity have irregular change pattern. Also, water quality improvement effect of seawater exchange facilities and sewage treatment plants is analysed quantitatively using averaged spatial and temporal data set. From this result, it is found that effect of sewage treatment plants is small and seawater exchange facilities at zone 1 and 2 is clear concentration reduction effect to be about 26% and 16%, respectively. After sewage treatment plants operation, DO concentration reduced about 10% at inner zone of Jumunjin Harbour, the other side, after seawater exchange facilities concentration DO concentration increased about 10%. DO concentration at 2005 estimated little than that of 2002, it is concluded that a yearly change of DO concentration has about 10%.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.18 no.3
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• pp.211-224
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• 2006

It was analysed that spatial and temporal change patterns of COD, TN and TP were measured monthly from 2002 to 2005 in Jumunjin Harbour. Cenerally, concentration of upper layer higher than lower layer, concentration difference of COD, TN and TP on upper lower layer at inner zone in Jumunjin Harbour higher than sea area front of breakwater. Seasonal change width of COD concentration different, but seasonal change pattern of COD, $NH_{4}-N$ and TN clearly showed. Water quality improvement effect of seawater exchange facilities and sewage treatment plants is analysed quantitatively using averaged spatial and temporal data set. Change of COD small at 2003, concentration reduced about $34{\sim}47%$ at all zones on 2004 and 2005. TN was influenced largely effect of seawater exchange facilities. Concentration reduction at zone 1, 2, 3 estimated about $60{\sim}70%,\;40{\sim}60%,\;40%$, respectively. As a consequence, concentration reduction of COD and TN that is, effect of water quality improvement influenced seawater exchange facilities appeared not only at inner zone, also sea area front of breakwater and entrance of Jumunjin Harbour.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2003.08a
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• pp.298-302
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• 2003

재래식 방파제를 설치하여 조성한 항내 수역은 항내ㆍ외로 해수유통이 원활하게 일어나지 않는 폐쇄성 수역이 될 수가 있다. 이런 수역에 항내의 자정능력을 초과하는 오염원이 유입되면 수질이 악화되어 항내수는 사용하지 못하게 될 뿐 아니라 항 전체가 오염되어 주민들의 폐적한 생활공간이 훼손되며, 주민의 보건도 악영향을 받는다. 이를 해결할 수 있는 1차적인 방안은 항내로의 오염원을 줄여 나가며 바닥에 가라앉은 오염물을 준설하는 것이고, 2차적으로 해수유통을 원활하게 할 수 있는 해수교환시설을 설치하는 것이다. (중략)

• Proceedings of the Korea Water Resources Association Conference
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• 2002.05b
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• pp.1051-1057
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• 2002

• Journal of Navigation and Port Research
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• v.27 no.2
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• pp.233-238
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• 2003

Due to the impermeability of outer wall facilities such as Breakwaters which dissipates the wave energy and keeps harbor tranquility, the enclosed area of harbor becomes partially blocked and the water exchange can be reduced. Recent trends of port development protect water quality and emphasize Water-Front, so the method which enhances the circulation of harbor waters and the dilution of the water pollutants are studied. The best improvement of water quality is a remove of pollutant source on land, but an enclosed port must be enhanced the tidal exchange. For this end, the best improvement may be made a drain-route on the existing outer wall facilities. In this study, the numerical computations were carried out to predict the circulation of harbor waters and the tidal exchange through the drain-rout in the polluted harbor(Samchonpo-guhang) located at the east coast of South Sea. Computational models adopting FDM(Finite Difference Method) were used here and were already verified from the previous studies und ocean survey. As a result of this study, circulation and the tidal exchange at the harbor before and after introduction of drain-route were assessed.

• 어항어장
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• s.83
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• pp.54-58
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• 2008

• 어항어장
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• s.82
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• pp.66-71
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• 2008

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2009.10a
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• pp.140-143
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• 2009