Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Society of Coastal and Ocean Engineers
Journal Basic Information
Journal DOI :
Korean Society of Coastal and Ocean Engineers
Editor in Chief :
Volume & Issues
Volume 27, Issue 6 - Dec 2015
Volume 27, Issue 5 - Oct 2015
Volume 27, Issue 4 - Aug 2015
Volume 27, Issue 3 - Jun 2015
Volume 27, Issue 2 - Apr 2015
Volume 27, Issue 1 - Feb 2015
Selecting the target year
Numerical Simulation Test of Scour around Offshore Jacket Structure using FLOW-3D
Ko, Dong Hui ; Jeong, Shin Taek ; Oh, Nam Sun ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 6, 2015, Pages 373~381
DOI : 10.9765/KSCOE.2015.27.6.373
As offshore structures such as offshore wind and offshore platforms have been installed frequently in ocean, scour effects are considered important. To test the scour effect, numerical simulation of scour has been carried out. However, the test was usually conducted under the uni-directional flow without bi-directional current flow in western sea of Korea. Thus, in this paper, numerical simulations of scour around offshore jacket substructure of HeMOSU-1 installed in western sea of Korea are conducted using FLOW-3D. The conditions are uni-directional and bi-directional flow considering tidal current. And these results are compared to measured data. The analysis results for 10,000 sec show that under uni-directional conditions, maximum scour depth was about 1.32 m and under bidirectional conditions, about 1.44 m maximum scour depth occurred around the structure. Meanwhile, about 1.5~2.0 m scour depths occurred in field observation and the result of field test is similar to result under bi-directional conditions.
Characteristics of Wave-induced Currents using the SWASH Model in Haeundae Beach
Kang, Min Ho ; Kim, Jin Seok ; Park, Jung Kyu ; Lee, Jong Sup ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 6, 2015, Pages 382~390
DOI : 10.9765/KSCOE.2015.27.6.382
To simulate a complicated hydrodynamic phenomena in the surf zone, the SWASH model is used in Haeundae Beach. The SWASH model is well known as a model competing with the Boussinesq-type model in terms of near shore waves and wave-induced currents modelling. This study is aimed to the detailed analysis of seasonal waves and wave-induced current simulation in Haeundae Beach, where the representative seasonal wave conditions was obtained from hourly measured wave data in 2014 by Korea Hydrographic and Oceanographic Administration( KHOA). Incident wave conditions were given as irregular waves by JONSWAP spectrum. The calculated seasonal wave-induced current patterns were compared with the field observation data. In summer season, a dominant longshore current toward the east of the beach appears due to the effect of incident waves from the South and the bottom bathymetry, then some rip currents occurs at the central part of the beach. In the winter season, ESE incident waves generates a strong westward longshore currents. However, a weak eastward longshore currents appears at the restricted east side areas of the beach.
Development of the Global Tsunami Prediction System using the Finite Fault Model and the Cyclic Boundary Condition
Lee, Jun-Whan ; Park, Eun Hee ; Park, Sun-Cheon ; Woo, Seung-Buhm ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 6, 2015, Pages 391~405
DOI : 10.9765/KSCOE.2015.27.6.391
A global tsunami prediction system was suggested for a distant tsunami using a finite fault model and a cyclic boundary condition. The possibility of the suggested system as a distant tsunami response system was checked by applying it into the case of 2014 Chile tsunami. A comparison between the numerical results(tsunami height and arrival time) with different conditions (boundary condition, governing equation, grid size and fault model) and measured data (DART buoy, tide station) showed the importance of the finite fault model and the cyclic boundary condition.
Wave Transformation using Modified FUNWAVE-TVD Numerical Model
Choi, Young-Kwang ; Seo, Seung-Nam ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 6, 2015, Pages 406~418
DOI : 10.9765/KSCOE.2015.27.6.406
The present modified FUNWAVE-TVD model, which is a modification to its previous version 2.1, is applied to solitary wave propagation and is tested against the experiments of Vincent and Briggs(1989) and Luth et al.(1994). The eddy viscosity breaking scheme is used for comparison with the existing study in the case of breaking experiment. The symmetry of wave-induced current is maintained when the modified model is employed to Vincent and Briggs(1989) breaking experiment, but the symmetry of wave-induced current in previous model is not maintained. A better agreement with the breaking experimental data is obtained in the modified model using eddy viscosity breaking scheme than the shock capturing breaking scheme using nonlinear shallow water equation. For comparison with the schemes in the model, the fourth order MUSCL-TVD scheme by Erduran et al.(2005) and the third order MUSCL-TVD scheme using minmod limiter is applied, and the numerical solutions of solitary wave are compared.
Flow Characteristic of Artificial Upwelling by CFD
Lee, Hwang Ki ; Kim, Jongkyu ; Lee, Moon Ock ; Kim, Hyeon-Ju ; Otake, Shinya ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 6, 2015, Pages 419~423
DOI : 10.9765/KSCOE.2015.27.6.419
The flowing caused by artificial upwelling structure occurs ascending water flowing and vortex of rear side. In this moment, plentiful nutrient in the bottom water moves to the surface of the water and makes those plankton and fishing ecology promoted so that the fishing productivity can be enhanced. In this study, the changes of the upwelling flowing is included in consideration of the conditions of stratification by using CFD. In the conclusion, the closer upwelling effect is from the artificial upwelling structure, the better effectiveness comes out. Regardless of the conditions of stratification, only the upwelling feature from the bottom to the surface was shown up. But considering the conditions of stratification, the repeated flowing feature between upwelling and downwelling was verified.
Prediction of Wave Force on a Long Structure of Semi-infinite Breakwater Type Considering Diffraction
Jung, Jae-Sang ; Lee, Changhoon ; Cho, Yong-Sik ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 6, 2015, Pages 424~433
DOI : 10.9765/KSCOE.2015.27.6.424
In this study, the wave force distribution acting on a semi-infinite and vertical-type long structure is investigated considering diffraction. An analytical solution of the wave force acting on long structures is also suggested in this study. The wave forces on long structures are evaluated for monochromatic, uni-directional random, and multi-directional random waves. Diffraction effects in front of the breakwater and on the lee side of the breakwater are considered. The wave force on a long structure becomes zero when the relative length of the breakwater (1/L) is zero. The diffraction effects are relatively strong when the relative length of the breakwater is less than 1.0, and the wave forces decrease greatly for long structure when the relative length of the breakwater is larger than 0.5. Therefore, it is necessary to consider diffraction effects when the relative length of the breakwater is less than 1.0, and the relative length of the breakwater must be at least 0.5 in order to obtain a reduction of wave force on long structures.
An Experimental Study on Depositional Properties of Cohesive Sediments in Masan Port
Yang, Su-Hyun ; Kim, Nam Hun ; Hwang, Kyu-Nam ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 6, 2015, Pages 434~442
DOI : 10.9765/KSCOE.2015.27.6.434
In this study, a series of deposition tests have been performed using an annular flume in order to estimate depositional parameter of natural sediments. The sediment of Masan Port has been collected for deposition tests, and total 18 deposition tests have been carried out on different bed shear stress respectively but with the same initial concentration. As the results, the minimum bed shear stress
, standard deviation
and time scale parameter
are found to be
, 0.54 and 0.87 respectively. Through comparing with results from previous studies for other sediments, the results of this study are shown to be good enough to verify.
Experimental Investigation for Evaluating Wave Forces on Perforated Caisson with Two Wave Chambers
Oh, Sang-Ho ; Ji, Chang-Hwan ; Lee, Dal Soo ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 6, 2015, Pages 443~451
DOI : 10.9765/KSCOE.2015.27.6.443
Design formula for estimating the wave loading on the perforated caisson having two wave chambers is yet available. In this study, the analysis results are presented with the experimental data for the wave force acting on such a breakwater model. Based on the experimental results, it was able to clarify the variation of wave action according to five different wave phases that are associated with peak wave loading at the three vertical walls. Then the force adjustment factor for double-chamber caisson was estimated, similarly as Takahashi and Shimosako (1994), which needs to be further validated with subsequent experiments and practical application in the field.