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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 2, Issue 2 - Aug 1999
Volume 2, Issue 1 - Feb 1999
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Simulating Bacterial Dispersion from Coastal Sewage Outfalls Using the QUICKEST Scheme
Kang Yun Ho ; Lee Moon Ock ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 2, 1999, Pages 20~30
To improve water quality particularly for sea bathers along the Fylde coastal zone near Blackpool, North West England, waste water from a sewage outfall is studied using a mathematical model. The explicit second order accurate central scheme and the third order accurate QUICKEST scheme are used to represent the diffusion terms and the advection terms of the advective-diffusion equation, respectively. Hydrodynamic model is run for a coarse and fine grid, of 1km and 200m, respectively, obtaining good agreement with measured data. Water quality model is then used to predict faecal coliform levels in the region for four different scenarios, including discharges from: - (i) Fleetwood outfall, (ii)River Ribble for summer condition, (iii)River Ribble for winter condition, and (iv)combined sewer overflows for the Blackpool and Fleetwood communities. Main findings from the simulations are:- (i) Fleetwood outfall has a negligible impact on the beaches with respect to pathogen levels; (ii) Discharge from River Ribble for both summer and winter conditions is predicted in the range of coliform levels 10 -500 counts/100ml along the beach at Lytham St. Annes; and (iii) The CSO effluent discharges are predicted not to advect out into offshore by stronger tidal currents.
Wide Vessel Traffic Service System Using Koreasat
Lee H.J ; Kang C.G. ; Lee C.M. ; Park J.S. ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 2, 1999, Pages 31~37
In this paper, authors introduce about wide vessel traffic service(VTS) system using automatic identification system(AIS). In order to develop the prototype of wide VTS system, Koreasat is used for AIS. In this system, ship position obtained by using GPS is reported automatically to VTS center through Koreasat. By using this system, VTS center can cover more wide area than the case using radar only. And the uncertainty of information decreases. The results of test show the good possibility of VTS using satellite and AIS.
The Analysis of Oil Spill Spreading Using SAR Images
Kim Taerim ; Lee Soo Hyung ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 2, 1999, Pages 38~48
The oil spill accident near Goeje Island on April 3, 1997 was analyzed using two RADARSAT SAR images. The first scene was acquired 3 days after the accident as an extended low beam mode and the second scene was acquired 12 hours after the first scene as a standard beam mode. The two scenes showed slicks not only by oil spills but also by oil spill look-alikes caused by wind sheltering, low wind, natural film, and etc. These slicks were analyzed and classified, and natural films produced from aquaculture farms around Goeje Island were also suggested as a strong candidate for slicks on SAR images. The study with two SAR imags indicated the oil spill patterns which spreaded to the southwest immediately after the accident and switched the direction to the east. The spreading patterns shown in two SAR images also showed good agreement with in-situ observations.
Variations of Physical Oceanographic Environment Caused by Opening and Closing the Floodgate in Nakdong Estuary
Kim Ki-Cheol ; Yang Han-Soeb ; Kim Cha-Kyum ; Moon Chang-Ho ; Jang Sung-Tae ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 2, 1999, Pages 49~59
Nakdong Estuary is complex water system, where sea water and fresh water meet each other. After construction of Nakdong River Barrier, the flow pattern and mixing processes have been changed. Variations of physical oceanographic environment in Nakdong Estuary due to opening and closing the floodgate of Nakdong River Barrier are analysed focusing the movement of outflows from the barrier. Surveys and analysis were made for the three cases. 1. Ordinary times (opening and closing the gate by the tidal period) 2. A period of flood time (opening the gate) 3. A period of water shortage (closing the gate).
A Study on Initial and Near-Field Dilution at the Ocean Outfall of Masan-Changwon Municipal Wastewater Treatment Plant
Kang See-Whan ; You Sung-Hyup ; Oh Byung-Cheol ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 2, 1999, Pages 60~69
In this paper, we have obtained the initial and near-field dilution rates of wastewaters discharged from the ocean outfall of Masan-Changwon municipal wastewater treatment plant from both of field measurements and CORMIX model simulations. In the summer of 1998, water temperature and salinity profiles was measured at 16 stations in the vicinity of the Masan outfall and the dilution rates were analyzed by salinity deficit method. The transport of the wastefields and their initial dilution rates were calculated by CORMIX model using field data as model input. Both of observed and predicted results are shown In very low dilutions with the range of 32～48 from the field data analysis and 29～43 from the model prediction, respectively. This indicates that the water quality in the Masan outfall area can be worsening due to the low dilution rates of diswastewaters, especially, when the ambient currents are very weak in a neap tide and ambient water density is highly stratified in summer.
Behavior of Oil-Water Interface between Tandem Fences
Kang Kwan Hyoung ; Lee Choung Mook ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 2, 1999, Pages 70~77
The disturbance of oil-water interface confined between tandem fences caused by a sequence of traveling vortices below the interface is investigated. The traveling vortices are assumed to be those detached from the tip of the fore fence. The potential flow is assumed and the density interface is replaced as a sheet of vortex. The shape of the interface is predicted by tracing a finite number of marker particles placed at the interface. The velocity of the marker particles is determined by the Biot-Savart integral along the vortex sheet plus the contribution from the traveling point vortices. The rate of change of vortex-sheet strength is predicted by using an evolution equation for vorticity. The calculated results obtained for various conditions demonstrate that the large amplitude of interfacial wave following the moving vortek can be generated by the vortices.
Tracking Model of Drifted Ships for Search and Rescue
Lee Moonjin ; Gong In-Young ; Kang Chang-Gu ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 2, 1999, Pages 78~85
Tracking model of a drifted ship lot the search and rescue mission in southern sea of Korea is studied. In this model, search area is determined by considering standard deviation of position around reference point. The reference point is estimated for a given type of ship when marine environmental conditions such as wind and current are given. A database for environmental data, which is necessary for the real-lime tracking of drilled ship, is gel)elated on southern sea and western sea of Korea. Using this database, the real-time prediction of wind and current is possible. The simulated trajectories and search area of our model ate validated by comparing with reported real data.
Development of Simplified Collision and Grounding Strength Assessment System of Oil Tankers
Lee T.K. ; Kim J.D. ; Chun T.B. ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 2, 1999, Pages 86~94
This paper describes a development of Collision/grounding Strength Assessment System (COSAS) using simplified method. This method is formulated in closed-form equation by taking into account crushing caused by bulbous bow collision and cutting caused by forward speed grounding. To verify the accuracy of the developed system, some examples for test models of double side/bottom structure in collision/grounding situation are considered. This system might be useful for analysis of structural damage of oil tankers in collision/grounding.
Performance Test of Vortex-Disc Skimmers
Yu J.S. ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 2, 1999, Pages 95~102
Various types of oil response equipments and oil recovery vessels are being developed in Korea from the 1990s to respond nil spill accidents. It should be considered prior to the selection of the oil skimmers to make the oil recovery system more efficient at early stage of oil spill accidents. Rotating baldes of vortex skimmer beneath the water surface concentrate oil and draw it into the weir, where it flows to a collection sump. In this study a recently developed Vortex-Disc skimmer(model : VDS-50) is introduced and the performance test results for the skimmer are discussed.