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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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A Study on a Vertical Transport Model of Coastal Sediments Using Particle Size Distribution Data from a Settling Column
Lee Du Gon ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 1, 1999, Pages 26~33
Coastal sediments in polluted areas adsorb many hydrophobic pollutants such as PCBs. During environmental remediation projects like dredging, they can be resuspended and transported to less polluted areas. To assess the environmental impact, the author previously developed a mathematical model that can simulate the changes of particle size distribution (PSD) due to sedimentation, vortical dispersion and coagulation. In this research, the simulation results using this model were presented in conjunction with observed PSDs from a 2-m settling column simulating coastal environments. The simulations showed that the model predictions were in fairly good agreement with the observed data (changes of PSDs in terms of depths and times), and that the resuspended sediments coagulated during the vertical transport. So, this study showed that the developed model has a good ability to describe the very complicated phenomena of real aggregation and vortical transport dynamics of coastal sediments with various particle sizes.
A Study on the Nondimensional Analysis for the Recovery Rate of Oil Using a Belt Type Skimmer
Yoon Kyunghwan ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 1, 1999, Pages 34~39
Removal of spilled oil over the sea and the river has become one of the urgent problems in these days. Removing oil using mechanical devices by adhesion method is known to be closely related with the problem of estimating the thickness of film remaining on the surface of solid withdrawn from a quiescent liquid. In the present study a series of experimental results are compared with the analytic estimation for the thickness of film remaining on the solid surface using non-dimensional analysis. For the case of pure water both results show the remarkable agreement. However, discrepancy has been found for the case of Bunker C oil and diesel oil. The analytic estimation over-predicts the experimental value for the case of Bunker C oil and under-predicts it for the case of diesel oil. Further study is required to investigate the real situation including a contact angle and the property difference between oil and water.
Experimental Study of Wave-Absorbing Performance by Horizontal Punching Plates
Jung H. J. ; Cho I. H. ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 1, 1999, Pages 40~48
Wave absorbing system is needed at various kinds of wave basins (wave flume, towing tank, square tank) for the model test related to the ocean engineering. In this paper, the performance of wave absorbing system with new concept is estimated throughout the experiments. Herein, the wave absorbing system is designed by punching plate with a given porosity which is installed horizontally and submerged near the water surface. As the incident wave generated by a wave maker advances above a punching plate, the strong jet flow is formed near a hole of punching plate. As a result, wave energy is dissipated into heat energy, Systematic model tests were conducted at KRISO to verify the performance of the wave absorber using a punching plate. It was found that the reflection coefficient of wave absorber is deeply dependent on both the porosity and the submerged depth of a punching plate. Inclined installation of a punching plate shows better performance than a horizontal one within a certain inclined angle.
Performance Tests of Oil Boom at Open Sea
Yu Jeongseok ; Lee Moonjin ; Kim Jinhwan ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 1, 1999, Pages 49~62
The main functions of oil booms are to prevent spreading of the oil slick and to increase the recovering efficiency of oil skimmers. The oil-containment capability of a floating boom on an open sea is affected by environmental parameters such as waves, currents and winds, as well as the motion characteristics of a boom section. In this study, a series of tests were conducted for three kinds of booms (internal foam type, air inflatable type, self-expanded type) at the open sea off Yosu, and the results are presented. Motion characteristics and oversplashing phenomenon were observed for each boom in different environmental conditions. And the tension exerted on towing line of the boom was also measured with a systematic varitation of towing speeds and gap ratios.
A Rough Estimation of Environmental Capacity in the Yellow Sea using a Numerical Hydrodynamic Model
Kim Gwang Su ; Kim Dong Myung ; Park Chung Kil ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 1, 1999, Pages 63~73
The results of residual currents simulation by a three-dimensional hydrodynamic model showed the water volume transport and the residence time to be about 4km³ per tidal cycle and about 6 years through the line of latitude, 34° 25' N in the Yellow Sea, and to be about 13km³ per tidal cycle and about 2.5 years through the southeastern boundary line of the Yellow Sea, respectively. On the bases of the entire seawater volume of the Yellow Sea and dissolved oxygen (DO) in summer, the environmental capacity of the Yellow Sea for reception of the maximum pollution load without reducing DO concentration below 5.0mg/ℓ in seawater may be estimated to be about 58×10/sup 6/tons of chemical oxygen demand (COD), which is equivalent to the load about 8 times as high as the annual organic pollution load from 14 major rivers. On the bases of DO transports by residual currents calculated on the line of 34° 25' N latitude and on the southeastern boundary line of the Yellow Sea being about 57×10³tons and about 203×10³tons of DO per day, respectively, the environmental capacities of the Yellow Sea for reception of the maximum pollution loads without reducing DO concentration in seawater nay be equivalent to COD loads about 3 times and 10 times, respectively, as high as the existing organic pollution loads from 14 major rivers.
Distributions and Budgets of Nitrogen and Phosphorus in Hiroshima Bay
Kim Do-Hee ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 1, 1999, Pages 74~89
Distributions and budgets of nitrogen and phosphorus in inner and central areas of Hiroshima bay were investigated for three years from January 1991 to December 1993. The mean loadings of nitrogen and phosphorus Stowed into the entire bay were 870 tonN/month and 129 tonP/month, respectively. About 79 % of nitrogen and 84 % of phosphorus loadings were flowed into the inner area. The TN:TP and DIN:DIP atomic ratios of the discharged freshwater were about 15 and 21, respectively. The PON:POP and DIN:DIP atomic ratios of seawater in the bay varied from 8 to 14 with a mean value of 11, and from 8 to 18 with a mean value of 12, respectively. Estimated fluxes of nitrogen and phosphorus based on the exchange of seawater were 585 tonN/month and 106 tonP/month, respectively, from the inner area to the central area, whereas those fluxes were 62 tonN/month and 107 tonP/month, respectively, from the central area to Akinada. When the remainders of nitrogen and phosphorus substracted outflows from inflows should be sunk, sink fluxes of nitrogen and phosphorus per surface area of the entire bay would be about 9.83 gN/m²ㆍyr and 0.27 gP/m²ㆍyr, respectively. In the central area, the remainders of nitrogen and phosphorus were greater than those in inner area. The residence times of nitrogen and phosphorus were estimated to be about 112 days, respectively, in the entire of Hiroshima Bay.
Design of Automatic Ship Maneuvering Control System
Kwak Moon Kyu ; Suh Sang-Hyun ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 1, 1999, Pages 90~101
This paper is concerned with the design of automatic ship maneuvering system including automatic path tracking controller and automatic berthing controller. The optimal control technique is employed to design the automatic path tracking controller, which is based on the linearized equations of ship motion. The numerical example shows that the automatic path tracking controller is capable of tracking the line between way points which are determined by pilot a priori. The decentralized control technique is employed to design the automatic berthing controller. In addition to the automatic path tracking controller, the fuzzy logic controller is used to control the forward speed. The numerical example shows that the automatic berthing controller can be successfully implemented.
A Study on the Optimum Environmental Conditions for the Creation and Restoration of Artificial Tidal Flat
Lee Jeoung-Gyu ; Okada Mitsumasa ;
Journal of the Korean Society for Marine Environment & Energy, volume 2, issue 1, 1999, Pages 102~112
The purpose of this study is to evaluate the effects of design criteria and environmental conditions of the site of created tidal flats on the structure and function of man-made ecosystem. Seven constructed tidal flats and three natural tidal flats were studied taking the difference in the location (wave height and tidal current), inflow of river water, slope of tidal flat and age after the construction completed into consideration. Parameters studied were physico-chemical and biological characteristics of soils and rate of respiration. The natural tidal flats had higher contents of silt, nitrogen and organic matter compared with the constructed ones. The natural ones had reductive zone below 2cm, whereas the constructed ones had aerobic zone from the surface to below 20cm. The bacterial population in the soil of the constructed tidal flats was one to two orders of magnitude lower than that in the natural ones. Both biomass of macrobenthos and microbial respiration rate, however, were not different significantly between the natural and the constructed tidal flats. There was an exceptional constructed tidal flat with similar physico-chemical and biological characteristics to the natural ones. It is most probable that sufficient conditions to have similar tidal flats to natural ones are the location in enclosed bay or calm coastal area. Thus, to make man-made tidal flats with the same characteristics as those in natural ones, man-made tidal flats should be designed and/or located to enhance the accumulation of silt on tidal flat. It is important to select a place having low water motion for construction of tidal flat.