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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 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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On Generation Methods of Oblique Incidence Waves in Three-Dimensional Numerical Wave Tank with Non-Reflected System
Hur, Dong-Soo ; Lee, Woo-Dong ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 6, 2011, Pages 401~406
DOI : 10.9765/KSCOE.2011.23.6.401
In this study, generation methods of oblique incident wave are newly proposed and examined using the fully non-linear numerical model with non-reflected wave generation system(LES-WASS-3D). In order to verify, free surface elevation and horizontal velocities are compared with
-order Stokes wave theory in 3-D oblique incident wave field. As a results, it is revealed that the numerical results by newly proposed technique are in good agreement with the theory.
Reliability Analysis of Pile Type Quaywall Using Response Surface Method
Lee, Sang-Geun ; Kim, Dong-Hyawn ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 6, 2011, Pages 407~413
DOI : 10.9765/KSCOE.2011.23.6.407
Reliability analysis of pile type quaywalls were done by using response surface method. Pier structures have implicit form of limit state function since they are flexible in motion, which is different from gravity type quaywalls. To solve a reliability analysis problem with implicit limit state function, response surface method was applied. Reliability indices of structure under seismic load were found for pier structures Then, they were compared with those found by simulation method. In numerical analysis, both the inclined type and vertical type were analyzed.
Spatial Distribution of Wave Overtopping along Vertical Structure due to Obliquely Incident Waves
Kim, Young-Taek ; Lee, Jong-In ; Cho, Yong-Sik ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 6, 2011, Pages 414~421
DOI : 10.9765/KSCOE.2011.23.6.414
In determination of the crest height of a vertical structure against attacking of obliquely incident waves, most of existing studies have suggested to use the overtopping reduction factor due to incident angles. However, they have not considered the amplification of wave heights and the spatial distribution of wave overtopping. In this study, a spatial distribution of overtopping due to the amplification of wave heights along a vertical structure is investigated experimentally. It is recommended that the crest height can be determined by the same manner as that for normally incident waves up to 3 significant wave lengths from the one end of the structure. However, the rest part of the structure can be done by employing the overtopping reduction factor with considering the amplification of wave heights and the spatial distribution of wave overtopping.
Reliability Index Optimization for Pier Type Quay Walls Using Life Cycle Cost
Kim, Dong-Hyawn ; Yoon, Gil-Lim ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 6, 2011, Pages 422~428
DOI : 10.9765/KSCOE.2011.23.6.422
Optimal reliability indices were found by optimizing life cycle cost(LCC) of pier type quay walls. Failure probability of pier and shore bridge were calculated by response surface method. Then, they were used to obtain recovery cost after damage. Costs for initial construction and maintenance were also considered in finding optimal reliability indices. Target reliability indices which may be used in reliability based design were suggested by numerical examples under seismic load and ship load.
Numerical Modeling of Tide Asymmetry in the Southeast Coastal Zone of Yellow Sea
Jung, Tae-Sung ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 6, 2011, Pages 429~441
DOI : 10.9765/KSCOE.2011.23.6.429
In the southeast coastal zone of Yellow Sea, the tide characteristics showing ebb-dominant tide and tidal flow were confirmed by analysis of observed tide and tidal currents. Physical factors generating asymmetric tide were reviewed. Influence of bottom shear stress, tidal flat, and nonlinear terms in shallow water equations was investigated by two-dimensional tide modeling. The model results gave good agreements with observed tides, but the amplitude of simulated
tide was less than that of observed tide. The tidal flats existing in the study area widely have great effect on the generation of nonlinear tide. The M4 tide is mainly generated near the tidal flats. The deletion of tidal flats prevents the production of the M4 tide. We can conclude that the wide tidal flats is a primary cause of tide asymmetry in the study area.
Analysis of Hydrodynamic Change around the Saemangeum Area Using a Particle Tracking Method
Suh, Seung-Won ; Lee, Hwa-Young ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 6, 2011, Pages 442~450
DOI : 10.9765/KSCOE.2011.23.6.442
A three dimensional random walk particle tracking method is applied to the Saemangeum area in order to find stepwise environmental changes according to long term construction. Flow regime around Mangyeong, Dongjin and Geum river estuary changed greatly due to dike construction. It is distinctive that reduction of Byeonsan area`s flow field and stagnant change in the northern part of the inner reservoir. Similar characteristics are found through the tidal excursion analysis. By analysis of the vertical mixing structures according to density stratification based on temperature and salinity variation, a salt wedge and very strong stratification arises in the inner part of the reservoir after final closure, while it has been well mixed or partially mixed estuary during construction. Shrinking of horizontal dispersion and vertical mixing capability may cause adverse effect on water quality not only inner part but also outer region of the Saemangeum reservoir.
The Simulation of Upwelling Flow Using FLOW-3D
Oh, Nam-Sun ; Choi, Ik-Chang ; Kim, Dae-Geun ; Jeong, Shin-Taek ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 6, 2011, Pages 451~457
DOI : 10.9765/KSCOE.2011.23.6.451
Large scale fishing ground can be made by upwelling flow. Recently the fishing ground development projects, using artificial upwelling by large structure under the sea, are in progress in Japan and Korea. In this study upwelling flow is simulated with FLOW-3D model. Using the movement of marker in FLOW-3D, the method for simulating upwelling of nutrients was experimented. The results show that FLOW-3D model can evaluate upwelling effect before starting real project.
Characteristics of Nearshore Surge-Intensity
Kang, Ju-Whan ; Kim, Yang-Seon ; Cho, Hong-Yeon ; Shim, Jae-Seol ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 6, 2011, Pages 458~465
DOI : 10.9765/KSCOE.2011.23.6.458
Characteristics of nearshore surge intensity were investigated by analyzing the tide data at 20 tidal stations. Statistical analysis of the surge data show that surge heights at the western coast are far greater than those at southern and eastern coasts, implying that each coast has its own classified characteristics. Surge height data greater than 30 cm were chosen and their intensities were calculated, and then, typhoon-induced surges were separated. The results show that while surge intensity at the western coast is conspicuous in winter due to the monsoon, it is conspicuous in summer due to the typhoon at other coasts. EOF analysis show that the 1st eigenvector at the western coast is prominent, which is considered to be consistent with above mentioned results.
Near-Field Hydrodynamic Analysis of the Submerged Thermal Discharge Using CFD Model
Hwang, In-Tae ; Kim, Deok-Ho ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 6, 2011, Pages 466~473
DOI : 10.9765/KSCOE.2011.23.6.466
The buoyancy and initial momentum fluxes make near-field dominated by buoyant jet when thermal discharge releases underwater. In order to estimate prediction capabilities of those near-field phenomena, non-hydrostatic RANS applied CFD(Computational Fluid Dynamic) model was used. Condition of model was composed based on past laboratory experiments. Numerical simulations carried out for the horizontal buoyant jet in the stagnant flow and vertical buoyant jet into crossflow. The results of simulation are compared with the terms of trajectory and dilution rate of laboratory experiments and analytic model(CorJET) results. CFD model showed a good agreement with them. CFD model can be appropriate for assessment of submerged thermal discharge effect because CFD model can resolve the limitations of near-field analytic model and far-field quasi 3D hydrodynamic model. The accuracy and capability of the CFD model is reviewed in this study. If the computational efficiency get improved, CFD model can be widely applied for simulation of transport and diffusion of submerged thermal discharge.
Plane Experiments for Estimating Performance of the Sluice of Tidal Power Plant
Oh, Sang-Ho ; Lee, Kwang-Soo ; Jang, Se-Chul ; Lee, Dal-Soo ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 6, 2011, Pages 474~481
DOI : 10.9765/KSCOE.2011.23.6.474
The discharge coefficient and spatial velocity distribution were clarified by carrying out a physical experiment to assess the performance of sluice for tidal power generation. The physical experiment was performed by manufacturing 10 sluce models whose scale is 1/70 of the prototype and installing it in the planar open channel, which has apron sections in front of and behind the sluice models. In particular, it was attempted to reasonably determine the locations and method of measuring water levels that may affect estimation of the discharge coefficient. Based on the experimental results for various conditions of discharges and tidal levels, the discharge coefficient of the sluice in the experiment was estimated as 1.3 to 1.4. Meanwhile, it was found that velocities were 2~3% faster at the sluices near the central region whereas 4~5% slower at the sluices on both sides, in comparison to the average value of the mean velocities of the ten sluices.
Modified SBEACH Model for Predicting Erosion and Accretion in front of Seadike
Han, Jae-Myong ; Kim, Kyu-Han ; Shin, Sung-Won ; Deguchi, Ichiro ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 6, 2011, Pages 482~488
DOI : 10.9765/KSCOE.2011.23.6.482
Seadike is a coastal structure constructed in the rear region of the foreshore to maximize its usability by preventing direct effect of wave. The expected construction field is determined under the design wave and tidal condition where minor wave overtopping is anticipated. Thus, the location of seadike is generally fixed at the highest site of the surrounding area with seadike crest height controlling the permissible range of wave overtopping volume. But a lot of times, frontal sand beach of the seadike continuously deforms due to incident waves, resulting failure in maintaining its initial slope. The erosion and deposition of the seadike front cause changes in the crest height and volume of wave overtopping and decrease in the setting depth of the seadike, which endangers seadike region as a result. In this study, the relation of local scouring and setting depth of the seadike front in the run-up region is examined by using 2D hydraulic model tests and numerical simulations by modified SBEACH model. As a result, the study learned that if appropriate boundary condition is applied to the modified SBEACH model, it is possible to create practical estimations on the local scouring at the seadike foot when erosive waves flow into the region.
Feasibility Study for Tidal Power Plant Site in Garolim Bay Using EFDC Model
Shin, Bum-Shick ; Kim, Kyu-Han ; Kim, Jong-Hyun ; Baek, Seung-Hwa ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 6, 2011, Pages 489~495
DOI : 10.9765/KSCOE.2011.23.6.489
Fossil fuel energy has become a worldwide environmental issue due to its effect on global warming and depletion in its supply. Therefore, the interest in developing alternative energy source has been rising. Ocean energy, especially, has gained strength as an alternative energy source for its unlimited supply with low secondary risks. Among all the ocean energy, the west coast of Korea holds the field of large-scale energy development because of its distinctive tidal range. Tidal power plant construction at the sea may expedite multi development effects such as bridge roles, tourism resource effects and adjustability of flood inundation at the inner bay. This study introduces the validity of tidal power plant construction at Garilim Bay in west coast of Korea by examining anticipated hydraulic characteristics using EFDC model. Through EFDC numerical simulations, the feasibility of Garolim Bay as a tidal power plant field has been proved. And the most effective tidal power plant construction would be to install hydraulic turbine in the west side of bay entrance where ebb current is stronger, and install water gate in the east side of bay entrance where the flood current is superior.
Missing Pattern of the Tidal Elevation Data in Korean Coasts
Cho, Hong-Yeon ; Ko, Dong-Hui ; Jeong, Shin-Taek ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 6, 2011, Pages 496~501
DOI : 10.9765/KSCOE.2011.23.6.496
The missing data patterns of tidal elevation data in Korean coasts are analysed and provided. The missing interval of the data is displayed for all stations using the missing data indicator matrix in order to identify the overall missing pattern. The spatial and temporal missing rates are also estimated. The total missing rate of tidal elevation data is low. However, most of the missing is mainly derived from just 1 or 2 specific stations. The autocorrelation function of the consecutive missing interval data also shows that the missing interval occurs randomly.