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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Marine Environment & Energy
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Journal DOI :
The Korean Society for Marine Environmental Engineering
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Volume & Issues
Volume 4, Issue 4 - Nov 2001
Volume 4, Issue 3 - Aug 2001
Volume 4, Issue 2 - May 2001
Volume 4, Issue 1 - Feb 2001
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Analysis and Quantification of Seawater Infiltration by Wave Action in Coastal Zone
Cheong Cheong-jo ; Choi Doo-hyoung ; Kim Tae-keun ; Okada Mitsumasa ;
Journal of the Korean Society for Marine Environment & Energy, volume 4, issue 4, 2001, Pages 3~11
To know the seawater infiltration into tidal flat sediment in coastal area is very important, because it is significantly correlated with the infiltration and transportation of pollutants in soil, the supply of dissolved oxygen, nutrients and organic matter to benthic organisms for survival of benthic organisms and the seawater purification. So, we set up purpose to clarify the infiltration behavior of seawater by wave action in tidal flat, to clear the effects of slope of tidal flat and breaking wave height on seawater infiltration and to quantify the infiltration volume of seawater. For purpose, the seawater infiltration was studied with visualization method by using coloring tracer and transparent glass beads replaced as natural sediment in model tidal flat. Specific conclusions derived from this study are as follows. The semi-circular type infiltration of seawater by wave action into saturated sediment was a new infiltration behavior that was not considered in previous studies. The infiltration rate of seawater was increased with increasing of breaking wave height and slope of tidal flat. However, the effects of the slope was bigger than that of breaking wave height on seawater infiltration into tidal flat sediments. It was possible to calculate the infiltration volume of seawater by wave action in natural tidal flat sediment and in fields. Therefore, we can point out that wave action play an important role in the supply of dissolved oxygen, nutrients and organic matter to benthic organisms, transportation or diffusion of pollutants and seawater purification. So, we hope to be studied the supply of food to benthic organism, pollutant transport and seawater purification on the base of these results.
Continuous Near-field Mixing with Variable Oceanic Conditions
Kang See Whan ; Kim Young Do ; Lee Ho Jin ; Kim Sang Ik ; Han Sung Dae ;
Journal of the Korean Society for Marine Environment & Energy, volume 4, issue 4, 2001, Pages 12~20
The temporal variability in near-field mixing characteristics of discharging plumes in oceanic environment was investigated using the time series data of the buoyant jet parameters. Based on the currents and density profiles observed in Masan outfall site and effluent discharge flowrates for 63days of summer season, the temporal variabilities and those occurrence frequency were obtained by line plume equations. The results show that wide range of variability in Masan outfall's mixing characteristics was found due to the temporal changes of effluent flowrates and ambient oceanic conditions. The near-field dilution was in the range of 30~71 with the averaged dilution of 34, which was a good agreement with field measurements of salinity deficit. The length of mixing zone was in the range of 5.4~36.2 m with the average of 9.5 m, and the plume rise height was in the range of 8.1~10.2 m with the average of 8.9 m. However, only the 30~44% of the whole results are higher than the averages, which indicates the necessity of this frequency analysis with the continuously measured data for designing and managing the ocean outfall system.
A Preliminary Study for the Prediction of Leaking-Oil Amount from a Ruptured Tank
Kim Wu-Joan ; Lee Young-Yeon ;
Journal of the Korean Society for Marine Environment & Energy, volume 4, issue 4, 2001, Pages 21~31
When an oil-spilling accident occurs at sea, it is of the primary importance to predict the amount of oil leakage for the swift response and decision-making. The simplest method of oil-leakage estimation is based on the hydrostatic pressure balance between oil inside the tank and seawater outside of leakage hole, that is the so-called Torricelli equilibrium relation. However, there exists discrepancy between the reality and the Torricelli relation, since the latter is obtained from the quasi-steady treatment of Bernoulli equation ignoring viscous friction. A preliminary experiment has been performed to find out the oil-leaking speed and shape. Soy-bean oil inside the inner tank was ejected into water of the outer tank through four different leakage holes to record the amount of oil leakage. Furthermore, a CFD (Computational Fluid Dynamics) method was utilized to simulate the experimental situation. The Wavier-Stokes equations were solved for two-density flow of oil and water. VOF method was employed to capture the shape of their interface. It is found that the oil-leaking speed varies due to the frictional resistance of the leakage hole passage dependent on its aspect ratio. The Torricelli factor relating the speed predicted by using the hydrostatic balance and the real leakage speed is assessed. For the present experimental setup, Torricelli factors were in the range of 35%~55% depending on the aspect ratio of leakage holes. On the other hand, CFD results predicted that Torricelli factor could be 52% regardless of the aspect ratio of the leakage holes, when the frictional resistance of leakage hole passage was neglected.
Denitrification and COD, TN and SS fluxes in Komso Bay, Korea
Kim Do-Hee ; Yang Jae-Sam ;
Journal of the Korean Society for Marine Environment & Energy, volume 4, issue 4, 2001, Pages 32~41
We measured the fluxes of COD, TN and 55 in addition to composition and quality of sediment in Komso Bay, West Coast of Korea. The fluxes of TN, SS and COD were measured during flood tide and ebb tide in April and August, 2000. Denitrification rates in the sediments was also measured by direct produced N2 gas technique on April and August from 1999 to 2000 in the same sea area. The composition of the sediments were 0.33~5.67 % of sand, 20.2~25.6 of gravel and 68.7~77.0 % of silt. Ignition loss of the sediments were 6.58~7.50 %. The concentration of hydrogen sulfide in the sediments were 0.028~0.326 mg/gㆍdry and oxidation reduction potential of the sediments were -28~-15 mV Diurnal fluxes of COD, total nitrogen, and suspended solids with tidal current and denitrification rate in the tidal flat have been determined in Komso Bay The diurnal net flux of COD was same in April. While 14.4 ton COD/hr of net influx into the tidal flat was recorded in August. The diurnal net influx of total nitrogen was 0.16 ton N/hr in April and 1.13 ton N/hr in August. The diurnal net influx of suspended solids was 0.05 ton SS/hr in April, and also net influx of suspended solids was 0.29 ton SS/hr in August. The overall purification ability of the tidal flat were estimated 0.00~5.69 g COD/m²/day, 0.06~0.45 g N/m²/day and 0.02~0.12 g SS/m²/day for COD, TN and SS, respectively. Denitrification rate was 0.009~1.720 m mole N₂/m²/day (average 0.702 m mole N₂/m²/day) in April and 0.033~0.133 m mole N₂/m²/day (average 0.077 m mole N₂/m²/day) in August, 1999. 0.000~l.909 m mole N₂/m²/day (average 0.756 m mole N₂/m²/day) in April, 0.000~1.691 m mole N₂/m²/day (average 0.392 m mole N₂/m²/day) in August, 2000. Even with a wide range of denitrification rate depending on the sampling location and studied periods, the average denitrification rate was estimated 0.482 m mole N₂/m²/day in the tidal flat of Komso Bay.
Study on the reduction of
and NOx emission by coastal transport of import-export container cargo
Kim S. H. ; Coh C. D. ; Cho Y. J. ; Van S. H. ;
Journal of the Korean Society for Marine Environment & Energy, volume 4, issue 4, 2001, Pages 42~50
In this paper, the reduction of CO₂ gas emission and exhaust gas emission by using the shift of coastal transport from land transport for import-export container cargo was proposed. At first, the domestic CO₂ gas emission, exhaust gas emission and the transportation of import-export container cargo are investigated. And also, we investigated the reduction of CO₂ gas emission and exhaust gas emission by the shift of coastal transport from land transport for the transportation of import-export container cargo between Kyongin area and Pusan Port. Finally, the change of NOx gas emission due to the change of the share of coastal transportation and using the 320TEU container ship are investigated. The research results show that the shift of coastal transport from land transport was effective to reduce the CO₂ gas emission and exhaust gas emission.
Study on Marine GIS Data Standards
Park Jongmin ; Suh Sanghyun ;
Journal of the Korean Society for Marine Environment & Energy, volume 4, issue 4, 2001, Pages 51~60
Recently there have been many trials and studies for various approaching to build the effective application environments for Marine Geographic Information System(GIS) in the cross sections of marine and GIS fields. But the most of these contributions were focused on their special purposes, and these vertically unmanaged and independent development necessarily caused more basic issues, which would be one of the primary elements to establish Marine Geospatial Information Infrastructure(MGII). Herein, we discuss a brief conceptual aspects of Marine GIS and its components, and then we try to give some fundamental issues especially concentrated on the needs and importance of standardization as well as guidelines for that.
Knowledge-Based Loading/Discharging Monitoring System for a Crude Oil lanker
Lee Kyung Ho ; Park Jin Hyung ; Lee Hee Yong ; Seo Sang Hyun ; Kwon Byung Kon ;
Journal of the Korean Society for Marine Environment & Energy, volume 4, issue 4, 2001, Pages 61~69
Recently, according to the rapid development of computer and electronic technology, most crude oil carriers adopt automated cargo handling system. But an excessive automation makes system so complicate that it could increase the Possibility of accidents due to human error. Although a cargo handling process is done by an expert, the potential of accidents by human factor lies through the whole cargo handling procedure and the current automated system lacks of the functionality to prevent a mis-operation and diagnose the abnormal status of the system. Because the oil concerned accident could be almost a disaster, the primary goal of system development should not be a fully automated system but be a perfectly safe system. This paper deals with the analysis and design of an expert system which can provide mariner with the operational guidance and the facility of crisis management by monitoring system's abnormal condition and human's mis-operation