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 20, Issue 6 - Dec 2008
Volume 20, Issue 5 - Oct 2008
Volume 20, Issue 4 - Aug 2008
Volume 20, Issue 3 - Jun 2008
Volume 20, Issue 2 - Apr 2008
Volume 20, Issue 1 - Feb 2008
Selecting the target year
3-Dimensional Analysis for Nonlinear Wave Forces Acting on Dual Vertical Columns and Their Nonlinear Wave Transformations
Lee, Kwang-Ho ; Lee, Sang-Ki ; Shiin, Dong-Hoon ; Kim, Do-Sam ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 20, issue 1, 2008, Pages 1~13
In the present work, wave transformation by vertical columns and its wave forces acting on them are discussed using a direct 3-D numerical model based on the VOF (Volume Of Fluid) method. The numerical results for wave transformations and wave forces are critically compared to an advanced experimental data, and provide the verification of the numerical model used in the present study. Overall model-data comparisons are good. After verification of the numerical model, it is used to simulate wave fields around dual vertical columns with arbitrary cross section, and the characteristics of nonlinear wave forces and wave transformations according to the variations of different cross section types of vertical columns, an interval of vertical columns and incident wave angle are discussed.
Rising Tendencies of both Tidal Elevation and Surge Level at the Southwestern Coast
Kang, Ju-Whan ; Park, Seon-Jung ; Park, Min-Won ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 20, issue 1, 2008, Pages 14~24
Recently, rising tendency of high water level is detected at southwestern coast. The result of harmonic analysis shows increasing trend of mean sea level, decreasing trend of the amplitudes of semi-diurnal tidal constituents, and increase of Sa tidal constituent, therefore, additional increase of high water level at Summer season. It shows also that maximum surge level has increased greatly, according to the frequent visit of big typhoon such as RUSA and MAEMI. Considering the correspondence of Sa and typhoon period, namely July
September, extraordinary high water level would be more probable. Especially, Mokpo and Jeju would be considered to have many chances of extraordinary high water level in the future.
Surface and Internal Waves Scattering by Partial Barriers in a Two-Layer Fluid
Kumar, P.Suresh ; Oh, Young-Min ; Cho, Won-Chul ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 20, issue 1, 2008, Pages 25~33
Water waves are generated mainly by winds in open seas and large lakes. They carry a significant amount of energy from winds into near-shore region. Thereby they significantly contribute to the regional hydrodynamics and transport process, producing strong physical, geological and environmental impact on coastal environment and on human activities in the coastal area. Furthermore an accurate prediction of the hydrodynamic effects due to wave interaction with offshore structures is a necessary requirement in the design, protection and operation of such structures. In the present paper surface and internal waves scattering by thin surface-piercing and bottom-standing vertical barriers in a two-layer fluid is analyzed in two-dimensions within the context of linearized theory of water waves. The reflection coefficients for surface and internal waves are computed and analyzed in various cases. It is found that wave reflection is strongly dependent on the interface location and the fluid density ratio apart from the barrier geometry.
Reliability Analysis of the GCM Data Downscaling Methods for the Climate-Induced Future Air Temperature Changes in the Coastal Zone
Lee, Khil-Ha ; Cho, Hong-Yeon ; Cho, Beom-Jun ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 20, issue 1, 2008, Pages 34~41
Future impact of anthropogenic climate-induced change on ecological regime has been an issue and information on water temperature is required for estimating coastal aquatic environment. One way to induce water temperature is to relate water temperature to air temperature and GCM is able to provide future air temperature data to do this. However, GCM data of low spatial resolution doesn't incorporate local or sitespecific air temperature in need of application, and downscaling processes are essential. In this study, a linear regression is used to relate nationally averaged air temperature to local area for the time period of 2000-2005. The RMSE for calibration (2000-2005) is 1.584, while the RMSE for validation is 1.675 for the year 2006 and 1.448 for the year 2007. The NSC for calibration (2000-2005) is 0.962, while the NSC for validation is 0.955 for the year 2006 and 0.963 for the year 2007. The results show that the linear regression is a good tool to relate local air temperature to nationally averaged air temperature with
of RMSE. The study will contribute to estimate future impact of climate-induced change on aquatic environment in Korean coastal zone.
Reliability Analysis of Sloped-Coastal Structures with Sea-Level Rise
Lee, Cheol-Eung ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 20, issue 1, 2008, Pages 42~48
A system of risk assessment is developed by using the reliability analysis which evaluate quantitatively both stability and performance of sloped-coastal structures according to several scenarios of sea-level rise. By using reliability functions on armor unit and run-up, the probabilities of failure can be straightforwardly calculated with respect to several design parameters such as nominal diameter of armor unit, slope of coastal structure, and freeboard height. By comparing the results before and after sea-level rise, it may be possible to exactly assess some ranges of decrease of stability and performance of sloped-coastal structure with respect to sea-level rise. Therefore, it can also be possible to make a decision which parameters should be repaired or strengthened in order to maintain the original stability and performance of sloped-coastal structures. Finally, The present results may be useful for designing some kinds of new sloped-coastal structures including the effect of sea-level rise.
Hydraulic Experiments of Stem Waves along a Vertical Wall due to Unidirectional Random Waves
Lee, Jong-In ; Choi, Jun-Woo ; Yoon, Sung-Bum ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 20, issue 1, 2008, Pages 49~61
This study investigates the characteristics of stem waves along a vertical wall generated by obliquely incident random waves through laboratory experiments conducted in a wave basin and numerical simulations using REF/DIF S model developed by Kirby and
(1994). The investigation is focused on the effect of random waves on the propagation characteristics of stem waves and the difference or similarity between monochromatic and random waves. The results of REF/DIF S model are compared with laboratory measurements and good agreements are obtained. The relative significant wave height along a wall is almost same with monochromatic condition, but the wave pattern along normal to the wall shows a significant difference.
An Analytical Model for Predicting Heat Transport with a Sharp Depth Change in Cross-Flow Direction
Lee, Ho-Jin ; Kim, Young-Ho ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 20, issue 1, 2008, Pages 62~72
In this study, an analytical model has been developed to predict the build-up of heat field due to a point heat source in the presence of sharp cross-flow depth change. The model has been applied to investigate the effect of the depth change and flow pattern on the heat field. Model results show that, when there is a sharp depth change in cross-flow direction, the heat transport across the boundary of the depth change is enhanced or diminished according to the increasing or decreasing of the horizontal diffusion flux. Including residual components as well as tidal currents give rise to reduce the effect of the horizontal diffusion on the heat transport because of increasing the advection of heat.
Experimental Investigation of Water Discharge Capability According to Shape of Sluice for Tidal Power Generation - I. Physical Experiment
Lee, Dal-Soo ; Oh, Sang-Ho ; Yi, Jin-Hak ; Park, Woo-Sun ; Cho, Hyu-Sang ; Kim, Duk-Gu ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 20, issue 1, 2008, Pages 73~80
An hydraulic experiment was carried out in an open channel flume in order to improve the technique of designing shape of the sluice used for tidal power generation, which greatly affects the economical efficiency of the construction of a tidal power plant. To predict the influence of change in the major design parameters relating to the sluice shape on the water discharge capability of the sluice, it was necessary to perform a precise experiment that is discriminated to previous feasibility studies or design projects. For this purpose, by installing various flow straighteners and rectifying structures inside the water supply system and the rectifying tank, the flow in the flume was stabilized as tranquil as possible. In addition, the measuring instruments and the location of installing them were carefully determined so as to minimize the errors intervened during the measurement of water discharge and water level. The method of estimating head difference between upstream and downstream of the sluice was also developed by taking account of the head loss due to the friction at the bottom and side walls in the flume.
Experimental Investigation of Water Discharge Capability According to Shape of Sluice for Tidal Power Generation - II. Experimental Results and Analysis
Lee, Dal-Soo ; Oh, Sang-Ho ; Yi, Jin-Hak ; Park, Woo-Sun ; Cho, Hyu-Sang ; Ahn, Suk-Jin ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 20, issue 1, 2008, Pages 81~92
In this study, the analysis results were presented for the experimental data of sluice for tidal power generation that were installed in an open channel flume. The experiment was carried out for the six different sluice models of different widths and bottom heights of the sluice throat section. If the side shape of the sluice was the same, the coefficient of discharge generally increased by increasing the width of the throat section. However, when the water discharge was small and the upstream water level was low, the coefficient of discharge increased for a while but decreased later with the increase of the throat section width. In addition, the coefficient of discharge was larger when the bottom height of the throat section was higher, regardless of the width of the throat section. It was concluded that the values of coefficient of discharge that were frequently used in the previous feasibility studies were underestimated so that should be adjusted to higher values.
Calculations of Storm Surges, Typhoon Maemi
Lee, Jong-Chan ; Kwon, Jae-Il ; Park, Kwang-Soon ; Jun, Ki-Cheon ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 20, issue 1, 2008, Pages 93~100
A multi-nesting grid storm surge model, Korea Ocean Research and Development Institute-Storm surge model, was calibrated to simulate storm surges. To check the performance of this storm surge model, a series of numerical experiments were explored including tidal calibration, the influence of the open boundary condition, the grid resolutions, and typhoon paths on the surge heights using the typhoon Maemi, which caused a severe coastal disasters in Sep. 2003. In this study the meteorological input data such as atmospheric pressure and wind fields were calculated using CE wind model. Total 11 tidal gauge station records with 1-minute interval data were compared with the model results and the storm surge heights were successfully simulated. The numerical experiments emphasized the importance of meteorological input and fine-mesh grid systems on the precise storm surge prediction. This storm surge model could be used as an operational storm surge prediction system after more intensive verification.
Numerical Simulation of Beach Profile Changes
Cheon, Se-Hyeon ; Ahn, Kyung-Mo ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 20, issue 1, 2008, Pages 101~109
Several numerical models for predicting beach profile changes have been developed by many researchers. Many of the earlier models are known to simulate the erosional profiles with the formation of offshore bar. However, most of the models don't have proper mechanism to incorporate the recovery process of the eroded profiles after a storm and can not simulate the beach accretion with acceptable accuracy. In order to overcome these shortcomings, we propose a new numerical model which has new features to simulate the accretional phase of beach recovery process after storm including such as redistribution of suspended sand particles near the breaking point. The simulation results of the proposed model were compared with LWT (Large Wave Tank) experiments performed at CRIEPI (Central Research Institute of Electric Power Industry in Japan) and CE (the Us Army Corps of Engineers) and it was shown to have performed better compared to SBEACH (Storm-induced BEAch CHange).
Digital 30sec Gridded Bathymetric Data of Korea Marginal Seas - KorBathy30s
Seo, Seung-Nam ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 20, issue 1, 2008, Pages 110~120
Gridded bathymetric data of 30 seconds apart in Korea marginal seas
are produced. In order to make the data, both updated gridded data of 1 minute apart on internet sites and all the digital nautical charts issued by National Oceanographic Research Institute (NORI) in Oct. 2007 are used. The reference level of the gridded data is approximate level of lowest low water and the horizontal coordinates are based on the WGS84 ellipsoid. Especially a developed computer program can collect all the sounding data including depth contour directly from the digital charts and UTM coordinates of the data are converted to the WGS84 coordinates from which accuracy of data is significantly improved. An interpolation method is adopted to produce the gridded data which are compared and analyzed against the existing gridded data. In this gridded data we can see significantly detailed topographic features which could not be found in the previous data.
Shoaling Characteristics of Boussinesq Models with Varying Nonlinearity
Park, Seung-Min ; Yoon, Jong-Tae ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 20, issue 1, 2008, Pages 121~127
Numerical experiments with weakly nonlinear MIKE21 BW module and fully nonlinear FUNWAVE model are performed to identify the nonlinear characteristics of Boussinesq models with varying nonlinearity. Generation of waves with varying amplitudes, nonlinear shoaling and wave propagation over submerged bar experiments showed the importance of nonlinear model in shallow water where nonlinearity becomes prominent. Fully nonlinear model showed the nonsymmetrical wave form more clearly and gave larger shoaling coefficients than those of weakly nonlinear model.
Storm Surge Height on Busan and Gyeongnam coastal region by an Attack of Super-Typhoon
Hur, Dong-Soo ; Lee, Hyeon-Woo ; Lee, Woo-Dong ; Bae, Ki-Sung ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 20, issue 1, 2008, Pages 128~136
Recently, the unusual climate change is happening from the global warming in the whole world, the Korean peninsula is also no exception. It is predicted by many researchers that, in the near future, the Super-Typhoon of overwhelming power will occur due to rising temperatures on the sea surface around the Korean peninsula. In this study, numerical simulation has been performed with the Super-Typhoons which combined route of Typhoon Maemi with typhoon conditons of Hurricane Katrina (New Oleans in U.S.A, 2005), Typhoon Durian (philippine, 2006) and Typhoon Vera (Ise Bay in Japan, 1959) at Busan and Gyeongnam coastal area which has been badly damaged due to storm surge every year. From the numerical results, it is revealed that the storm surge heights of the Super-Typhoons are higher than that of Maemi, specially the storm surge height in the case of Katrina is about 4 times larger. So, it can be pointed out that the construction of countermeasures against disasters are very important in order to prepare against an attack of the Super-Typhoons.