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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Marine Environment & Safety
Journal Basic Information
Journal DOI :
The Korean Society of Marine Environment and safety
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Volume & Issues
Volume 20, Issue 6 - Dec 2014
Volume 20, Issue 5 - Oct 2014
Volume 20, Issue 4 - Aug 2014
Volume 20, Issue 3 - Jun 2014
Volume 20, Issue 2 - Apr 2014
Volume 20, Issue 1 - Feb 2014
Selecting the target year
Numerical Experiment on the Drift Diffusion of Harmful Algal Bloom
Seo, Ho-San ; Kim, Dong-Sun ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 4, 2014, Pages 335~344
DOI : 10.7837/kosomes.2014.20.4.335
To understand the drift-diffusion of HAB(Harmful Algal Bloom) in this paper, we used three-dimensional hydrodynamic model POM(Pringceton Ocean Model) and Lagrangian particle track module. First, the results of residual flow that considered tide, wind, temperature, salinity, and TWC(Tsushima Warm Current) effect was tend to northeast in the coastal area and the flow in the offshore region showed results similar to TWC. To understand of HAB's movement, released each area that southern Kamak bay(Case 1), Mijo coast(Case 2), and southern Mireukdo coast(Case 3) assumption that red tide occurred. The areas where the HAB occurs frequently. As a result of HAB occurred in southern Kamak Bay(Case 1), mainly drifts to Narodo coast and Yeoja bay that located on the west side. Case 2 was mainly drifts to Yokjido coast and Saryangdo coast Especially, HAB occurred in Mireukdo coast(Case 3) relatively many particles drift to eastward as the influence of the TWC.
A Study on the Environmental Assessment Guideline for Tidal Current Energy Development
Kim, Tae-Yun ; Park, Jeong-Il ; Maeng, Jun-Ho ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 4, 2014, Pages 345~357
DOI : 10.7837/kosomes.2014.20.4.345
This study aims to develop a guideline of environmental assessment for tidal current energy development in Korea. Based on an extensive discussion of the environmental effects of tidal current energy, this study provides an appropriate guideline for environmental assessment on tidal current energy development in Korea. The guideline includes a method for proper site selection and specific techniques for environmental impact assessment. The guideline for environmental impact assessment consists of four steps - including current condition investigation, impact predictions, identification and incorporation of mitigation measures, and post environmental monitoring - to effectively predict and assess impacts of tidal current energy development on the ocean environment. It is expected that the guideline can facilitate the often demanding environmental assessment review process and to reduce the time taken for it.
Evaluation of Characteristics of Particle Composition and Pollution of Heavy Metals for Bottom Sediments in Cheonsu Bay, Korea -Comparison of the Sediments Environment of Farming Area and Non-farming Area
Kim, Jong-Gu ; Jang, Hyo-Sang ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 4, 2014, Pages 358~371
DOI : 10.7837/kosomes.2014.20.4.358
For the systematic scientific management in Cheonsu Bay of Korea, this study was conducedt to survey the particle composition, organic matter(I.L.) and heavy metals in farming and non-farming areas. The sediment of study area showed feature mixed property by sand, silt and clay. The farming area showed superior by fine-grained sediment, non-farming area showed superior by coarse-grained sediment. The organic pollution of farming area were appeared to be heavily polluted more than non-farming area. The concentration of total nitorgen in sediment was higher farming area than non-farming area. Also, in the case of heavy metals pollution in sediments, farming area was higher than non-farming area. The correlation analysis among to heavy metals, organic matter and particle size was found to have a good interrelationship. For evaluation of heavy metals pollution of sediments, three criteria are applied, Enrichment Factor(EF), Geoaccumulation index(Igeo) and NOAA criteria for sediment. In the case of EF, Heavy metals pollution was appeared to artificial effect all heavy metals if except Cu. In the case of Geoaccumulation index, Cu, Al, Pb was shown zero grade, that is non polluted group, and Cd, Hg, Cr was shown to 0~1 grade, that is mid polluted group, As was shown to 2 grade, that is moderately polluted group. In the case of NOAA, pollution levels of heavy metals except Cd belonged to a group of ERL(Effect range low)~ERM(Effect range median).
Non-Outbreak Cause of Cochlodinium Bloom in the Western Coast of Jaran Bay in Summer, 2013 : On the Basis of Nutrient Data
Kwon, Hyeong-Kyu ; Kim, Hyun-Jung ; Yang, Han-Seob ; Oh, Seok-Jin ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 4, 2014, Pages 372~381
DOI : 10.7837/kosomes.2014.20.4.372
We investigated cause of non-outbreak of Cochlodinium polykrikoides blooms in the western coast of Jaran Bay during Summer, 2013, by combining chemical field data and physiological data of C. polykrikoides, which had been already published. The predominant species were mainly diatoms, and dominant species was Cerataulina pelagica, Chaetoceros spp., Navicula spp. and Nitzschia spp.. In case of dissolved inorganic nutrients in the western coast of Jaran Bay, dissolved inorganic phosphorus (DIP) was similar to that in previous outbreak period of C. polykrikoides blooms, but dissolved inorganic nitrogen (DIN) was lower. C. polykrikoides might be disadvantageous in competition with diatom species because half-saturation constants (Ks) of C. polykrikoides for inorganic nutrients was lower than those of diatoms. Also, the western coast of Jaran Bay, where DIN concentration is relatively low, was an unfavorable environment for growth of C. polykrikoides characterized by nitrogen dependence. Therefore, C. polykrikoides which have the disadvantageous position for competition of inorganic nutrient might have been suppressed by diatom blooms under environment of low nutrient in the western coast of Jaran Bay.
Analysis of Ground Watertable Fluctuation at the Sandy Barrier Island on Jinu-do in Nakdong River Estuary
Park, Jung-Hyun ; Yoon, Han-Sam ; Lee, In-Cheol ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 4, 2014, Pages 382~388
DOI : 10.7837/kosomes.2014.20.4.382
This study selected five observational stations in the normal direction of Jinu-do(island) shoreline and observed water temperature, electrical conductivity and pressure from March, 2012 to January, 2013(about 11 months) and attempted to see the variation characteristics of ground watertable. This study wants to know : 1) External environment force factors(tide, climate, wave etc.) affecting ground watertable variation through time series and correlation analysis. 2) Spatial variations of ground watertable and electrical conductivity change by storm event. First, we found that the station at the intertidal zone was strongly affected by wave and tide level and the stations at sand dune and vegetation zone was affected by precipitation and tide level through time series data and correlation analysis. Second, during the storm event, we found that ground watertable and electrical conductivity are stabilized at the start line of sand dune and vegetation zone and transition zone between freshwater layer and seawater layer exists in the experiment area and is about 50~70 m from coastline of the south side of Jinu-do(island).
A Study on the Way of Securing the Practical Effectiveness of Oil Record Book
Choi, Jung-Hwan ; Lee, Sang-Il ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 4, 2014, Pages 389~397
DOI : 10.7837/kosomes.2014.20.4.389
The purpose of this thesis is studying for a legal basis and definition of Oil Record Book. In the thesis, comparing with the laws related to punishment for false entry of Oil Record Book of the maritime countries and korea Act. Studying the improvement marine pollutants from ships by suggesting legal and institutional proposal which are able to make themselves increase effectiveness for recording and inspection of Oil Record Book. Suggest the solution of the problems raised in this thesis, First, The Oil Record Book should not be the evidence which is having the effectiveness simply after the accident of marine pollution, but take sanction on pre-inspection of Oil Record Book as establish the concrete administrative punishment for each contents-based record of Oil Record Book. Second, It should set up of judgement criteria of false entry of Oil Record Book by port state control officer. Third, It should strengthen the legal effectiveness of Oil Record Book contents such as Code(c) ; oil residue, Code(d); relating to bilge discharge by including premeditation for false entry of Oil Record Book. Also, The enhancement of role for marine pollution prevention manager raise the effectiveness of Oil Record Book as recognizing the importance of Oil Record Book.
A Study on the Revision of Regulations for Effective Operation of Anchorage
Yun, Gwi-Ho ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 4, 2014, Pages 398~404
DOI : 10.7837/kosomes.2014.20.4.398
The criteria of operating anchorage and the unit of anchorage capacity have not been unified and the different terms have been used in same matters in each regulations related to the anchorages provided in major domestic ports. The competent authorities and vessels which are going to use anchorages are confused due to those situations. This paper suggests the schemes to unify criteria of operating anchorage, the unit of anchorage capacity and terms used in same matters through reviewing the anchorage operating regulations provided in major domestic ports. In addition, this paper suggests that the principles of anchorage naming, the unit of anchorage capacity and the number of vessels that can be accommodated should be established at the next revision of regulations through reviewing the status of anchorages in major foreign ports to minimize the confusion on operating anchorages.
A Study on the Necessary Thrust of Tugs through the Ship's Towing Test
Jung, Chang-Hyun ; Nam, Taek-Kun ; Choi, Hyuek-Jin ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 4, 2014, Pages 405~411
DOI : 10.7837/kosomes.2014.20.4.405
It needed the calculation of the required tugboat's power to move the damaged vessel to the safe area for reducing the additional damages. In this paper, it was verified the theoretical calculation method on the required power of tugboat through the 93m real ship tests. From the experiments, it was considered that the theoretical calculation method was sufficient to estimate the required power of tugboat. The resistance of the locked propeller was relatively big portions compared with other static resistances such as air resistance, frictional resistance and residual resistance. And dynamic resistance induced by swing movement and yawing was continuously occurred and it also was great effects on the total resistance. In the future, the safety factor will be considered and the exact prediction of ship's resistance will enhance the efficiency of tugboat because of the minimization of safety factor.
A Study on Comparison and Analysis of Motion Sickness Inquiry with MSI Calculation for Training Ship Kaya
Han, Seung-Jae ; Ha, Young-Rok ; Kim, In-Chul ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 4, 2014, Pages 412~418
DOI : 10.7837/kosomes.2014.20.4.412
In this paper, for better boarding performance and pleasant boarding sensitivity of the ship, comparison and analysis was performed of motion sickness questionnaire with MSI(Motion Sickness Incidence) calculation based on ship motion theory(Strip Method) due to sea condition, incident angle in main sail way, economic speed, and calculation position of the training ship Kaya of Pukyong National University. On theses works, the rougher sea conditions became, the higher total motion sickness rate was occurred. The weights of vertical acceleration and the rates of MSI were higher at the bridge and the accommodation, which were located farther from the center of gravity of the ship. And effects of the vertical acceleration of the ship were increased in rolling then in head sea. In comparison between motion sickness questionnaire with MSI calculation, when the vertical acceleration increased, the motion sickness rate increased. The location to increase vertical acceleration and the location to cause motion sickness were agreed.
Effect of Grid, Turbulence Modeling and Discretization on the Solution of CFD
Park, Dong-Woo ; Yoon, Hyun-Sik ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 4, 2014, Pages 419~425
DOI : 10.7837/kosomes.2014.20.4.419
The current work investigated the variation of numerical solutions according to the grid number, the distance of the first grid point off the ship surface, turbulence modeling and discretization. The subject vessel is KVLCC. A commercial code, Gridgen V15 and FLUENT were used the generation of the ship hull surface and spatial system and flow computation. The first part of examination, the effect of solutions were accessed depending on the grid number, turbulence modeling and discretization. The second part was focus on the suitable selection of the distance of the first grid point off the ship surface:
. When grid number and discretization were fixed the same value, the friction resistance showed differences within 1 % but the pressure resistance showed big differences 9 % depending on the turbulence modeling. When
were set 30 and 50 for the same discretization, friction resistance showed almost same results within 1 % according to the turbulence modeling. However, when
were fixed 100, friction resistance showed more differences of 3 % compared to
of 30 and 50. Whereas pressure resistance showed big differences of 10 % regardless of turbulence modeling. When turbulence modeling and discretization were set the same value, friction, pressure and total resistance showed almost same result within 0.3 % depending on the grid number. Lastly, When turbulence modeling and discretization were fixed the same value, the friction resistance showed differences within 5~8 % but the pressure resistance showed small differences depending on the
Comparison of Resistance for Mono keel and Twin keel of Sail Yacht
Kwon, Soo-Yeon ; Choi, Ji-Hoon ; Choi, In-Sik ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 4, 2014, Pages 426~434
DOI : 10.7837/kosomes.2014.20.4.426
The research developed twin keel yacht for everyone which is able to stand erectly on mud flat without list and intended to commercialize the development product for popularization of west coast's marine leisure industry. Yacht's linear was utilized by "Blue Water21" has superior performance among the existing sailing yachts and twin keel model has been tested by calculation of mono keel's extent and its center of gravity. The result was that only 4 % of difference have been identified between mono keel and twin keel's hydrodynamic resistance which was smaller difference than predicted.
Development of Radar Cross Section Analysis Program for Complex Structures
Kwon, Hyun-Wung ; Hong, Suk-Yoon ; Song, Jee-Hun ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 4, 2014, Pages 435~442
DOI : 10.7837/kosomes.2014.20.4.435
In this paper, radar cross section (RCS) analysis program, RACSAN has been developed to predict RCS of complex structures. RACSAN is based on the high frequency range analysis method of Kirchhoff approximation in physical optics (PO). This program can present RCS including multi-bounce effect in complex structures by combination of geometric optics (GO) and PO method. GO method has a concern in the evaluation of the effective area, and PO method is involved in the calculation of RCS for the final effective area that is evaluated by GO method. Comparisons of the predicted results and analytical solutions showed that the developed program could be an effective tool for predicting RCS in complex structures.
Experimental Study on Hydrofoil Arrangement and Longitudinal Moment Characteristics for Navigation Safety of High Speed Craft
Park, Hwa-Pyeong ; Kim, Sang-Hyun ; Lim, Geun-Nam ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 4, 2014, Pages 443~450
DOI : 10.7837/kosomes.2014.20.4.443
In this study, we have discussed about the effect of hydrofoil arrangement and longitudinal moment characteristic on longitudinal motion stability of fully-submerged hydrofoil by the experiment of tandem hydrofoil model. First of all, tandem hydrofoil model that has canard wing arrangement has been made and characteristics of lift force and drag force by performing the lift force and drag force measuring experiment has also been estimated. Besides, tandem hydrofoil model's wing arrangement which has the initial stability and self stability of longitudinal motion has also been determined. In longitudinal stability experiment of tandem hydrofoil model, the motion characteristic of pitch and heave and the longitudinal stability of foil borne condition by variation of self stability of longitudinal moment and longitudinal distance are estimated. The result from the experiment and it's important conclusion can be described as below; Increase the self stability for longitudinal moment, the higher self stability for pitch motions in a constant pitch angles. By increasing the self stability for longitudinal moment, the range of fluctuation of pitch motion and heave motion for pitch angle also will change relatively small and longitudinal stability is excellent. Lastly, when the lift force of hydrofoil is remain constants, we can conclude that securing the enough self stability for longitudinal moment is essential for stable foil borne condition of tandem hydrofoil.
Critical Elastic Buckling Load Investigation of Aluminium Alloy A6082-T6 Square plate Subjected to Patch Loading
Oh, Young-Cheol ; Ko, Jae-Yong ;
Journal of the Korean Society of Marine Environment & Safety, volume 20, issue 4, 2014, Pages 451~460
DOI : 10.7837/kosomes.2014.20.4.451
In this paper, we examined the problem of the structural stability according to the patch load of a rectangular plate that reflects the material properties of A6082-T6 is used primarily for marine plant structure. it applied to the four patch loading shapes, the effect of aspect ratio, a boundary condition and calculated the critical elastic buckling load. Calculating the critical elastic buckling load, During the eigenvalue buckling analysis it is applied to the shell181 as 4 node shell element. when the plate subjected to patch loading compare to the plate under a uniform axial compression load, it is possible observed to occur the different elastic buckling behaviour and it could be confirmed that it is affected significantly on a variable position and type of loadings, such as the effect of the aspect ratio. Also, Critical elastic buckling load according to th patch loading type in simply supported rectangular plate a/b=1.0,
=200mm are calculated 67%(Loading type I), 119 %(Loading type II), 76 %(Loading type III), 160 %(Loading type IV), respectively. Loading type I and III could be determined with the strong elastic buckling behavior much more than Loading type II and IV.