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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 21, Issue 6 - Dec 2009
Volume 21, Issue 5 - Oct 2009
Volume 21, Issue 4 - Aug 2009
Volume 21, Issue 3 - Jun 2009
Volume 21, Issue 2 - Apr 2009
Volume 21, Issue 1 - Feb 2009
Selecting the target year
Effects of Typhoon's Characteristics on the Storm Surge at Gyeongnam Coastal Zone
Kang, Ju-Whan ; Park, Seon-Jung ; Moon, Seung-Rok ; Yoon, Jong-Tae ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 21, issue 1, 2009, Pages 1~14
Linear-tracked typhoons were simulated to investigate the effect of parameter sensitivity at Gyeongnam coastal zone. To do this, appropriateness of the linear-tracked MAEMI(0314) was tested and 175 scenarios were simulated on the basis of virtual MAEMI. The results show surge heights are relatively large at Masan and Tongyeong, and it can be attributed to topographical effects. At Masan, 2.5 m-surge height is probable with the same intensity but slightly different track from the real typhoon MAEMI. At the other stations, surge heights induced by real MAEMI are nearly same as the maximum heights of the virtual typhoons, which indicates the real track of the typhoon MAEMI was almost the most severe one. Surge heights caused by the barometric effect are higher than those by the wind effect, and the former effect shows the maximum at the eye of typhoon.
Reliability Analyses of Breakwater Armor Blocks of Harbors in Korea
Kim, Seung-Woo ; Suh, Kyung-Duck ; Lee, Cheol-Eung ; Park, Dong-Heon ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 21, issue 1, 2009, Pages 15~29
Most breakwater armor blocks are designed by using Hudson's or van der Meer's formula. The minimum weight of armor blocks is calculated by equating the resistance to the load in each formula. The larger value is then chosen as the design weight. In this study, we have performed reliability analyses for thus designed breakwater armor blocks of 12 trade harbors and 8 coastal harbors in Korea. The probability of failure calculated by the reliability analysis provides a criterion for evaluating the stability of armor blocks. The calculated probability of failure was almost same for all the breakwaters so that we were able to quantitatively evaluate the safety level of armor blocks of existing breakwaters. We also found that the safety factor used in the deterministic design method and the probability of failure in the reliability design method show a linear relationship. Therefore the probability of failure of existing breakwaters can be quantitatively calculated from the safety factors. The calculated probability of failure could also be used for determining the target probability of failure in the future.
Measurement and Numerical Model on Wave Interaction with Coastal Structure
Kim, In-Chul ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 21, issue 1, 2009, Pages 30~38
In recent years, there's been strong demand for coastal structures that have a permeability that serves water affinity and disaster prevention from wave attack. The aim of this study is to examine the wave transformation, including wave run-up that propagates over the coastal structures with a steep slope. A numerical model based on the nonlinear shallow water equation, together with the unsteady nonlinear Darcy law for fluid motion in permeable underlayer and laboratory measurements was carried out in terms of the free surface elevations and fluid particle velocities for the cases of regular and irregular waves over 1:5 impermeable and permeable slopes. The numerical results were used to evaluate the application and limitations of the PBREAK numerical model. The numerical model could predict the cross-shore variation of the wave profile reasonably, but showed less accurate results in the breaking zone that the mass and momentum influx is exchanged the most. Except near the wave crest, the computed depth averaged velocities could represent the measured profile below the trough level fairly well.
Elliptic Numerical Wave Model Solving Modified Mild Slope Equation with Nonlinear Shoaling and Wave Breaking
Yoon, Jong-Tae ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 21, issue 1, 2009, Pages 39~44
To improve the accuracy of numerical simulation of wave trans- formation across the surf zone, nonlinear shoaling effect based on Shuto's empirical formula and breaking mechanism are induced in the elliptic modified mild slope equation. The variations of shoaling coefficient with relative depth and deep water wave steepness are successfully reproduced and show good agreements with Shuto's formula. Breaking experiments show larger wave height distributions than linear model due to nonlinear shoaling but breaking mechanism shows a little bit larger damping in 1/20 beach slope experiment.
Drag Coefficient Estimation of Pile Type Structures by Numerical Water Basin Experiments
Park, Il-Heum ; Lee, Geun-Hyo ; Cho, Young-Jun ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 21, issue 1, 2009, Pages 45~53
A possibility of the drag coefficient estimation in numerical water basins was discussed where the numerical solution were calculated by the 3-dimensional hydro-dynamical model (FLOW-
) with the RNG
turbulence model. On the known cases of the drag coefficients for a rectangle, the numerical drag coefficients got
and the wind tunnel values were
. For a cylinder, the numerical values were calculated as
in the range of 0.5
Behavior of Overtopping Flow of Caisson Breakwater with Dissipating Block: Regular Wave Conditions
Ryu, Yong-Uk ; Lee, Jong-In ; Kim, Young-Taek ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 21, issue 1, 2009, Pages 54~62
The present study investigates the behaviour of overtopping flows falling on the leeside of a caisson breakwater with dissipating blocks through laboratory measurements. The falling overtopping flows in the leeside are expected to directly affect the leeside stability of the breakwater. This study focuses on not the resultant stability but the characteristic pattern of the overtopping flows depending on wave conditions through examining front velocity and plunging distance in the leeside. Regular waves were used to investigate the dependence of the overtopping flow pattern on wave conditions and a modified image velocimetry combining the shadowgraphy and cross-correlation method was employed for measurements of image and velocity. From the measurements, it is shown that the plunging distance and front velocity of the overtopping flow in the breakwater leeside increase as the wave period or height increases. From non-dimensional relationships between the variables, empirical formula for the velocity and overtopping distance are suggested.
Development of the Combined Typhoon Surge-Tide-Wave Numerical Model Applicable to Shallow Water 1. Validation of the Hydrodynamic Part of the Model
Chun, Je-Ho ; Ahn, Kyung-Mo ; Yoon, Jong-Tae ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 21, issue 1, 2009, Pages 63~78
This paper presents the development of dynamically combined Typhoon generated surge-tide-wave numerical model which is applicable to shallow water. The newly developed model is based on both POM (Princeton Ocean Model) for the surge and tide and WAM (WAve Model) for wind-generated waves, but is modified to be applicable to shallow water. In this paper which is the first paper of the two in a sequence, we verified the accuracy and numerical stability of the hydrodynamic part of the model which is responsible for the simulation of Typhoon generated surge and tide. In order to improve the accuracy and numerical stability of the combined model, we modified algorithms responsible for turbulent modeling as well as vertical velocity computation routine of POM. Verification of the model performance had been conducted by comparing numerical simulation results with analytic solutions as well as data obtained from field measurement. The modified POM is shown to be more accurate and numerically stable compare to the existing POM.
Development of the Combined Typhoon Surge-Tide-Wave Numerical Model 2. Verification of the Combined model for the case of Typhoon Maemi
Chun, Je-Ho ; Ahn, Kyung-Mo ; Yoon, Jong-Tae ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 21, issue 1, 2009, Pages 79~90
This paper presents the development of dynamically combined Typhoon generated surge-tide-wave numerical model which is applicable from deep to shallow water. The dynamically coupled model consists of hydrodynamic module and wind wave module. The hydrodynamic module is modified from POM and wind wave module is modified from WAM to be applicable from deep to shallow water. Hydrodynamic module computes tidal currents, sea surface elevations and storm surges and provide these information to wind wave module. Wind wave mudule computes wind waves and provides computed information such as radiation stress, sea surface roughness and shear stress due to winds. The newly developed model was applied to compute the surge, tide and wave fields by typhoon Maemi. Verification of model performance was made by comparison of measured waves and tide data with simulated results.