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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 1, Issue 2 - Aug 1998
Volume 1, Issue 1 - Feb 1998
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Dispersion Characteristics of Spilled Oil by Waves and Velocity Shear
Seol Dong-Guan ; Ryu Cheong-Ro ; Kim Jong-Kyu ;
Journal of the Korean Society for Marine Environment & Energy, volume 1, issue 2, 1998, Pages 18~26
The major interest of this paper is how the spilled oil over the sea is dispersed into water column especially under the shear and turbulence such as breaking wave. Two hydraulic experiments were conducted to investigate the oil stick break-up characteristics into small and large droplets under the variation of velocity shear and breaking waves. From the experiments in the shear generator and the wave flume, small droplets which have diameters of tens to hundreds of micrometers were uniformly distributed throughout the whole control volume as time goes by. In addition, it can be seen that the weathered spilled oil has a different break-up mechanism from fresh spilled oil.
The Performance of a Horizontal Flexible Membrane Breakwater in Waves
Cho I.H. ; Hong S.W. ; Kim M.H. ;
Journal of the Korean Society for Marine Environment & Energy, volume 1, issue 2, 1998, Pages 27~39
The interaction of monochromatic incident waves with a horizontal flexible membrane is investigated in the context of two-dimensional linear hydro-elastic theory. First, analytic diffraction and radiation solutions for a submerged impermeable horizontal membrane are obtained. Second, the theoretical prediction was compared with a series of experiments conducted in a two-dimensional wave tank at Texas A&M University. The measured reflection and transmission coefficients reasonably follow the trend of predicted values. Using the developed computer program, the performance of surface-mounted or submerged horizontal membrane wave barriers is tested with various system parameters and wave characteristics. It is found that the properly designed horizontal flexible membrane can be an effective wave barrier.
Containment Failures of Oil Restricted by Vertical Plates in Current
Song Museok ; Hyun Beom-Soo ; Suh Jung-Chun ;
Journal of the Korean Society for Marine Environment & Energy, volume 1, issue 2, 1998, Pages 40~51
The interaction of contained oil slicks with current was investigated with a two-dimensional experimental setup in the circulating water channel facility. A vertical plate was used to contain the oils against the currents and the evolution of the oil slick, mainly focusing on the water/oil interface, was examined with an aid of a laser sheet. Two different oils - soy bean oil and diesel oil - were studied with varying the current speed (10 cm/sec to 35 cm/sec), the barrier depth (4 cm and 8 cm) and the volume of oil (2 liter to 12 liter). Different types of the interface behavior were observed according to the conditions and their mechanism was discussed based basically on the dimensional analysis. The critical speeds of two types of oil loss mechanism (entrainment failure and drainage failure) were also examined.
Oil Spill Behavior forecasting Model in South-eastern Coastal Area Of Korea
Ryu Cheong Ro ; Kim Jong Kyu ; Seol Dong Guan ; Kang Dong Uk ;
Journal of the Korean Society for Marine Environment & Energy, volume 1, issue 2, 1998, Pages 52~59
Many concerns are placed on preservation of coastal environment from the spilled oil contaminant in the coastal area. And the use of computer simulation model to combat with oil spill has come to play mote important role in forecasting the oil spill trajectory so as to protect coastal area and minimize the damage from oil contaminants. The main concerns of this study is how the movements of spilled oil are affected by currents including tidal, oceanic, and wind-driven currents. Especially, in the present paper, the oil spill trajectory can be predicted by a real-time system that allows prediction of circulation and wind field. The harmonic methods are adopted to simulate the tidal currents as well as it can be possible to achieve the wind-field data and oceanic current data from the established database. System performance is illustrated by the simulation of oil spill in the south-eastern coastal area of Korea. Simulation results are compared with the observed one.
Loading Characteristics and Environmental Changes in Closed Coastal Water
Lee Chan-Won ; Kwon Young-Tack ; Yang Ki-Sup ; Jang Pung-Guk ; Han Sung-Dae ;
Journal of the Korean Society for Marine Environment & Energy, volume 1, issue 2, 1998, Pages 60~70
Masan Bay is a typical enclosed coastal sea and receving body of discharges from Masan city and Changwon city. A POTW(Publicly Owned Treatment Works) started operation from November 1993 when the population of drainage area increased abcent 1.0 million and the effluent from this Plant has being discharged to the enclosed sea where is located at 15km distance from inner Masan Bay. Thus the inflow pattern to Masan Bay has been changed. The main objective of this research is to evaluate the relationship between urban wastewater discharge and water qualify change in a typical coastal zone. It is necessary a) to evaluate the change of input loadings, b) to determine the effect on water quality changes, and c) to find the respective importance of improvement options that must be controlled in the wastewater treatment plant. It was concluded that the sea water quality has being adversely affected by the discharge of insufficiently treated urban wastewater and the nutrient removal in wastewater treatment was very important and urgent.
Wave Climate at Hong-do and Mara-do Sea Areas
Kim Do Young ;
Journal of the Korean Society for Marine Environment & Energy, volume 1, issue 2, 1998, Pages 71~81
In this paper the statistical characteristics of the waves at Hong-do and Mara-do are examined. The wane scatter diagrams of H/sub s/ and T/sub z/ and H/sub 1/3/and T/sub 1/3/ at two locations are given and various statistical characteristics of the ocean waves are examined. If the sea is not narrowband, the modified Rayleigh distribution introduced by Longuet-Higgins can be used for the individual wave height distribution. However the modified Rayleigh distribution has not been widely used due to the inconvenience of determining the empirical constant. In this paper a simple method to determine the empirical constant for the modified Rayleigh distribution is proposed. Extreme waves based on the measured wave data are estimated. There is no significant difference depending on the distribution functions. However the estimations of the extreme waves from H/sub s/ and H/sub 1/3/ show considerable difference.
A Study on Rescue Technique and Safe Tow of Damaged Ship (2) - Failure Mechanisms of Collision and Grounding of Double Hull Tanker -
Lee Sang-Gab ; Choi Kyung-Sik ; Shon Kyoung-Ho ;
Journal of the Korean Society for Marine Environment & Energy, volume 1, issue 2, 1998, Pages 82~95
In this paper, two series of numerical simulations are performed using LS/DYNA3D: The first series of numerical simulations are collision events between a 310,000 DWT double hull VLCC (struck ship) and two 35,000 and 105,000 DWT tankers (striking ships). Collisions are assumed to occur at the middle of the VLCC with the striking ships moving at right angle to the YLCC centerline. The second ones, grounding accidents of two 40,000 DWT Conventional and Advanced Double Hull lanker bottom structures, CONV/PD328 and ADH/PD328 models. The overall objective of this study is to understand the structural failure and energy absorbing mechanisms during collision and grounding events for double hull tanker side and bottom structures, which lead to the initiation of inner shell rupture and cause the kinetic energy dissipation to bring the ship to a stop. These numerical simulations will contribute to the estimation of damage extents of collision and grounding accidents and the future improvements in lanker safety at the design stage.
Application to the Water and Sediment Model for the Management of Water Quality in Eutrophicated Seto Inland Sea, Japan
Lee In Cheol ; Chang Sun-duck ; Kim Jong Kyu ; Ukita Masao ;
Journal of the Korean Society for Marine Environment & Energy, volume 1, issue 2, 1998, Pages 96~108
The management of water quality and fishery resources with a major environmental problem in eutrophic coastal sea is studied. The numerical experiments using the water-sediment quality model (WSQM) were carried out for the management of water quality at the Seto Inland Sea in Japan. The results of long-term water quality simulation showed responses of seawater quality to input loads to vary in different localities. A formula roughly forecasting water qualify to estimate the effect of loading abatement was proposed. The simulation for the improvement of seawater quality showed the abatements of nutrient loads such as total phosphorus (TP) and total nitrogen (TN) as well as organic loads such as chemical oxygen demand (COD) to be peformed in the eastern Seto Inland Sea from Bisan Seto to Osaka Bay. On the other hand, it is indicated that the increase of loading leads to the increase of primary production. while not straightly to the increase of fish production for the catch of fisheries.