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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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Journal DOI :
Korean Society of Coastal and Ocean Engineers
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Volume & Issues
Volume 23, Issue 6 - Dec 2011
Volume 23, Issue 5 - Oct 2011
Volume 23, Issue 4 - Aug 2011
Volume 23, Issue 3 - Jun 2011
Volume 23, Issue 2 - Apr 2011
Volume 23, Issue 1 - Feb 2011
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Creating a High-Definition Animation of Tsunami Propagation
Kim, Kyeong-Ok ; Yuk, Jin-Hee ; Min, Byung-Il ; Choi, Byung-Ho ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 5, 2011, Pages 327~334
DOI : 10.9765/KSCOE.2011.23.5.327
Simulation of the trans-oceanic or trans-basin propagation of a tsunami is a computer-intensive task. This study demonstrates an effective and detailed visualization technique to deal with the vast amount of surface-elevation and velocity-field output. This high-definition visualization technique is used to present simulations of the 1960 and 2010 Chilean earthquake tsunamis and the 1983 Central East (Japan) Sea earthquake tsunami. This tsunami-visualization method using high-definition graphic animation is an appropriate tool to show detailed tsunami-propagation behavior over an ocean or coastal sea, as exemplified by the Pacific Ocean and East (Japan) Sea tsunami events.
Non-hydrostatic modeling of nonlinear waves in a circular channel
Choi, Doo-Yong ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 5, 2011, Pages 335~344
DOI : 10.9765/KSCOE.2011.23.5.335
A curvilinear non-hydrostatic free surface model is developed to investigate nonlinear wave interactions in a circular channel. The proposed model solves the unsteady Navier-Stokes equations in a three-dimensional domain with a pressure correction method, which is one of fractional step methods. A hybrid staggered-grid layout in the vertical direction is implemented, which renders relatively simple resulting pressure equation as well as free surface closure. Numerical accuracy with respect to wave nonlinearity is tested against the fifth-order Stokes solution in a two-dimensional numerical wave tank. Numerical applications center on the evolution of nonlinear waves including diffraction and reflection affected by the curvature of side wall in a circular channel comparing with linear waves. Except for a highly nonlinear bichrmatic wave, the model`s results are in good agreement with superimposed analytical solution that neglects nonlinear effects. Through the numerical simulation of the highly nonlinear bichramatic wave, the model shows its capability to investigate the evolution of nonlinear wave groups in a circular channel.
Discussion on Optimal Shape for Wave Power Converter Using Oscillating Water Column
Lee, Kwang-Ho ; Park, Jung-Hyun ; Baek, Dong-Jin ; Cho, Sung ; Kim, Do-Sam ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 5, 2011, Pages 345~357
DOI : 10.9765/KSCOE.2011.23.5.345
Recently, as part of diversifying energy sources and earth environmental issues, technology development of new renewable energy using wave energy is actively promoted and commercialized around Europe and Japan etc. In particular, OWC(Oscillating Water Column) wave power generation system using air flow induced by vertical movement of the water surface by waves in an air-chamber within caisson is known as the most efficient wave energy absorption device and therefore, is one of the wave power generation apparatus the closest to commercialization. This study examines air flow velocity, which operates turbine(Wells turbine) directly in oscillating water column type wave power generation structure from two-and three-dimensional numerical experiments and discusses optimal shape of oscillating water column type wave power generation structure by estimating the maximum flow rate of air according to change in shape. The three-dimensional numerical wave flume was applied in interpretation for this study which is the model for the immiscible two-phase flow based on the Navier-Stokes Equation. From this, it turned out that size of optimal shape appears differently according to the incident wave period and air flow is maximized at the period where minimum reflection ratio occurs.
Modeling the effect of nutrient enrichment on the plankton population: Validation using mesocosm experiment data
Song, Yong-Sik ; Choi, Hee-Seon J. ; Yoo, Sang-Cheol ; Hong, Hyeon-Pyo ; Seo, Ji-Ho ; Lee, Hyo-Jin ; Kim, Tae-In ; Woo, Seung-Buhm ; Choi, Jung-Ki ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 5, 2011, Pages 358~368
DOI : 10.9765/KSCOE.2011.23.5.358
Responses of plankton populations to nutrient enrichment in mesocosm experiments in Shihwa lake were simulated using FVCOM. Dissoloved oxygen module was added to the FVCOM to simulate impacts of its decreased levels. The ecological model included the major components of the pelagic ecosystem including nutrients, phytoplankton (pico-, nano-, micro-), zooplankton (two groups of protozoa, mesozooplankton), particulate organic matter, dissolved organic matter and bacteria, and was calibrated using trophodynamic data collected from Gyeonggi Bay and Shihwa Lake. The model was able to reproduce major responses of plankton populations to nutrient enrichment, including phytoplankton of different size groups, change of dominance of protozoa from < 20
oligotrichs to scuticociliates, and reponses to bacteria and low levels of dissolved oxygen in water column of the mesocosms.
Estimation of the Tsunami Force Acting on Onshore Oil Storage Tanks and Houses
Lee, Kwang-Ho ; Park, Bo-Bae ; Kim, Chang-Hoon ; Choi, Nack-Hoon ; Kim, Do-Sam ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 5, 2011, Pages 369~382
DOI : 10.9765/KSCOE.2011.23.5.369
This study investigated the tsunami force acting on onshore structures using a numerical program, three-dimensional one-field model for immiscible multi-phase flows, which is based on Navier-Stokes solver. In this paper, the characteristics of tsunami of oil storage tank and house structures studied to the distance between the seawall and structure. In addition, the study compared and analyzed the tsunami forces determined by considering drag force only and considering both drag and inertia forces. These numerical results were compared with the design standard. As a results, the case of considering the both forces is more close to numerical result than that of considering the drag force only.
Study on Relationship Between Geographical Convergence and Bottom Friction at the Major Waterways in Han River Estuary using the Tidal Wave Propagation Characteristics
Yoon, Byung-Il ; Woo, Seung-Buhm ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 5, 2011, Pages 383~392
DOI : 10.9765/KSCOE.2011.23.5.383
The basic research of the estuarine circulation at Gyeong-Gi bay has not been well studied up to now, although coastal development pressures have been continuously increased. To understand the oceanographic phenomena at the Han River estuary, it`s essential to understand the propagation characteristic of tidal wave which is the strongest external forcing in this region. In this study, we investigate the tidal wave propagation characteristics along the 3 major channels using observation data and numerical model. It is found that 3 channels are all hyper-synchronous and the most important physical factor controlling the tidal wave propagation is topographical convergence of estuary shape and friction. The result of analytic solution at ideal channel considering the topographical convergence and friction show that the contribution of physical role of convergence and friction varies at 3 different channel. And the ratio of convergence and friction at Yeomha channel is four times larger than Seokmo channel. Because of this effect, the location of maximum amplitude at Yeomha channel is showed up downward than Seokmo channel. The ratio of decreasing amplitude and increasing phase per unit distance between stations is bigger than Seokmo channel. Although 3 major channel show a hyper-synchronous pattern, Yeomha shows more frictionally dominant channel and Seokmo channel is more dominantly affected by convergence effect.
Periodic characteristics of long period tidal current by variation of the tide deformation around the Yeomha Waterway
Song, Yong-Sik ; Woo, Seung-Buhm ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 5, 2011, Pages 393~400
DOI : 10.9765/KSCOE.2011.23.5.393
The mass transport is very complicated at the area which has the macro tide and complex geometry such as Gyeonggi bay. Especially, the long period current has a strong influence on the estuarine ecosystem and the long-term distribution of substances. The long period current is caused by several external forcing, whose unique characteristic varies spatially and temporally. The variation characteristics of long period current is analysed and its generation mechanism is studied. The tidal nonlinear constituents such as overtide and compound tide are generated due to nonlinear interaction and it causes mean sea level setup. The tidal wave propagating up into estuary is transformed rapidly by decrease of cross-sectional area and depth. Therefore the mean sea level is getting rise toward upriver. The high and low tide level is similar between down-river(Incheon) and up-river(Ganghwa) during neap tide when the tidal deformation is decreased. The tidal phase difference between two tidal stations causes a periodic fluctuation of sea level difference. The low water level of Ganghwa station during spring tide does not descend under EL(-)2.5 m, but the low water level of Incheon fall down under EL(-)4.0 m. The variation of tidal range and its sea level are increased during spring tide. It is found that the long period current
is quite similar to that of sea level difference between the two tidal stations. It means that the sea surface inclination caused by the spatial difference of tidal deformation is important forcing for the generation of long period current.