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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society of Coastal and Ocean Engineers
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Korean Society of Coastal and Ocean Engineers
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Volume & Issues
Volume 28, Issue 3 - Jun 2016
Volume 28, Issue 2 - Apr 2016
Volume 28, Issue 1 - Feb 2016
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Analysis of the Effect of Reducing Wave Overtopping by Wave Return Walls
Oh, Sang-Ho ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 28, issue 1, 2016, Pages 1~6
DOI : 10.9765/KSCOE.2016.28.1.1
The effect of reducing wave overtopping by use of the wave return wall was quantitatively analyzed based on physical experiments. The overtopping discharge for the arc seawall and the inclined seawall was measured and compared with the predictive formula that estimates reduction of overtopping by the wave return wall. When the overtopping discharge was relatively large (
), the agreement in terms of overtopping reduction rate was fairly good between the prediction and the measurement. For the condition of smaller overtopping than the above criterion, however, the discrepancy was large between the predicted and measured result. In this context, it is required to develop a better formula for estimating reduction of wave overtopping by the wave return wall.
Development and Verification of Simplified Collision Model for Pile Protective Structures
Lee, Gye Hee ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 28, issue 1, 2016, Pages 7~12
DOI : 10.9765/KSCOE.2016.28.1.7
In this study, a simplified collision model of pile protective structures against a navigation vessel was proposed and verified. The model of pile protective structure were composed by two plastic hinges at below of cap slab and the inside of ground. A nonlinear equation of motions was developed in consideration of the kinematic energy, potential energy and deformation energy in collision event. The developed simplified model were verified by the precise finite element collision analysis of the vessel and the protective structure.
Numerical Simulation of Water Level Change at the Coastal Area in the East Sea with the Inverted Barometer Effect
Hyun, Sang Kwon ; Kim, Sung Eun ; Jin, Jae Yull ; Do, Jong Dae ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 28, issue 1, 2016, Pages 13~26
DOI : 10.9765/KSCOE.2016.28.1.13
Sea water level variations are generally influenced by a variety of factors such as tides, meteorological forces, water temperature, salinity, wave, and topography, etc. Among non-tidal conditions, atmospheric pressure is one of the major factors causing water level changes. In the East Sea, due to small tidal range which is opposite to large tidal range of the Yellow Sea, it is difficult to predict water level changes using a numerical model, which consider tidal forcing only. This study focuses on the effects of atmospheric pressure variations on sea level predictions along the eastern coast of Korea. Telemac-2D model is simulated with the Inverted Barometer Effect(IBE), and then its results are analyzed. In comparison between observed data and predictions, the correlation of prediction with IBE and tide is better than that of tide-only case. Therefore, IBE is strongly suggested to be considered for the numerical simulations of sea level changes in the East Sea.
Time Domain Analysis on Deck Wetness of a Caisson Wet-towed in Irregular Waves
Heo, Jae-Kyung ; Park, Chang-Wook ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 28, issue 1, 2016, Pages 27~33
DOI : 10.9765/KSCOE.2016.28.1.27
A numerical analysis on deck wetness is carried out for a large caisson directly wet-towed by tugs in irregular waves. A constant panel method is used for linear analysis in frequency domain and a statistical post-processing for the deck wetness is presented. Hydrodynamic coefficients obtained from the frequency domain computation are imported for time domain analysis which enables complete modeling for towing equipment, environment, etc. Both frequency and time domain computations over two sea states are performed and comparison is made. In the time domain analysis, towing systems of various arrangements of tugs are investigated from short-term prediction for the largest deck wetness and the number of occurrences of deck wetness.
Hierarchical Bayesian Model Based Nonstationary Frequency Analysis for Extreme Sea Level
Kim, Yong-Tak ; Uranchimeg, Sumiya ; Kwon, Hyun-Han ; Hwang, Kyu Nam ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 28, issue 1, 2016, Pages 34~43
DOI : 10.9765/KSCOE.2016.28.1.34
Urban development and population increases are continuously progressed in the coastal areas in Korea, thus it is expected that vulnerability towards coastal disasters by sea level rise (SLR) would be accelerated. This study investigated trend of the sea level data using Mann-Kendall (MK) test, and the results showed that the increasing trends of annual average sea level at 17 locations were statistically significant. For annual maximum extremes, seven locations exhibited statistically significant trends. In this study, non-stationary frequency analysis for the annual extreme data together with average sea level data as a covariate was performed. Non-stationary frequency analysis results showed that sea level at the coastal areas of Korean Peninsula would be increased from a minimum of 60.33 mm to a maximum of 214.90 mm by 2100.
A Study of Ship Wave Crest Pattern
Lee, Byeong Wook ; Lee, Changhoon ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 28, issue 1, 2016, Pages 44~52
DOI : 10.9765/KSCOE.2016.28.1.44
Kelvin's (1887) theory that predicts position of ship wave crest can be applied only in deep water. Havelock's (1907) theory that predicts cusp locus angle can be applied in whole water depths but cannot predict the position of ship wave crest. In this study, using the linear dispersion fully, we develop the equations to predict ship wave crest in whole water depths and, using the developed equations, we predict cusp locus angle. We simulate ship wave propagation using FLOW-3D in the condition of Johnson's (1985) hydraulic experiment and find that the cusp locus angles predicted by the present theory are close to numerical results of FLOW-3D and hydraulic experimental data. We also simulate for various conditions and compare numerical results of distances between adjacent wave crests and values predicted by the present theory. For Froude number less than unity, the numerical results are close to the values predicted by the theory. For Froude number greater than unity, the constant value of
which determines the distance between the ship and the first ship wave crest is almost equal to zero and the numerical results of distances between adjacent ship waves excluding the first ship are close to the values predicted by the theory.
Generation of a Standard Typhoon using for Surge Simulation Consistent with Wind in Terms of Return Period
Kang, Ju Whan ; Kim, Yang-Seon ; Kwon, Soon-Duck ; Choun, Young-Sun ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 28, issue 1, 2016, Pages 53~62
DOI : 10.9765/KSCOE.2016.28.1.53
Extreme wind speeds at four sites including Mokpo, Gunsan, Incheon and Jeju near the Western Coast have been estimated with a tool of Monte Carlo simulation and typhoon data. Results of sensitivity analysis show that closeness between distance to the eye and the radius to maximum wind is most sensitive. While location angle and pressure deficit are sensitive too, but translation velocity is not. A standard typhoon, which results in extreme wind speeds having various return period, can be constructed by combination of parameter informations of each site. Then, with a numerical modelling of the typhoon, extreme surge heights having the same return period can also be obtained. To be added, by analysing the data which only including those based on navigable semicircle, it is possible to produce a standard typhoon which could result in setting-down of sea level.