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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 14, Issue 4 - Sep 2002
Volume 14, Issue 3 - Sep 2002
Volume 14, Issue 2 - Jun 2002
Volume 14, Issue 1 - Mar 2002
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Probability of Failure on Sliding of Monolithic Vertical Caisson of Composite Breakwaters
, Cheol-Eung ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 2, 2002, Pages 95~107
A reliability analysis on sliding of monolithic vertical caisson of composite breakwaters isextensively caried out in order to make the basis for the applicability of reliability-based design method. Therequired width of caisson of composite breakwaters is determined by the deterministic design method includingthe effect of impulsive breaking waves as a function of water depth, also studied interactively with the results ofreliability analyses. It is found that the safety factor aplied in current design may be a litle over-weighted mag-nitude for the sliding of caison. The reliability index/failure probability is also sen to slowly decrease as thewater depth increases for a given wave condition and a safety factor. In addition, optimal safety factor canroughly be evaluated by using the concept of target reliability index for several incident waves. The variations ofoptimal safety factor may be resulted from the diferent wave conditions. Finaly, it may be concluded from thesensitivity studies that the reliability index may be more depended on the incident wave angles and the waveperiodsrather than on the bottom slopes and the thickness of rubble mound.
Pollutants Dischage Modeling in Mankyung and Dongjin Rivers
Ko, Jae Won ; Cho, Hong Yeon ; Jeong, Shin Taek ; Kweon, Hyuck Min ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 2, 2002, Pages 108~115
Pollutants discharge modeling was caried out in the watershed of Mankyung and Dongjin rivers.The watershed and polutants source information extracted and analysed by the GIS tool was used as the modelinput parameters. This model was calibrated by comparison of the measured and computed monthly freshwaterdischarge and water quality(WQ) concentration. The compared WQ data are the ten-year-mean WQ concentra-tion and monthly WQ concentration in 1999. The results show that the watershed runof is underestimated insummer season, although the seasonal trends are relatively wel estimated. The WQ concentrations were alsorelatively well estimated except Iksancheon. The computed concentration was much lower than the observedconcentration in Iksancheon because of the effect of poluted sediment. Thus, the effects of poluted sediment onwater column need further study through measuring and analysing the degre of the sediment contamination.
Accuracy Evalution of Dispersion-Correction Finite Difference Model for Tsunami Propagation
Yoon, Sung Bum ; Lim, Chae Ho ; Cho, Yong-Sik ; Choi, Chul-Sun ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 2, 2002, Pages 116~127
Most of finite diference numerical models for the simulation of tsunami propagation developed sofar are based on the shalow-water equations which are frequently solved by the leap-frog scheme. If the grid sizeis properly selected, this numerical scheme gives a correct dispersion effect for constant water depth. However,if the water depth changes, the dispersion effect of tsunamis can not be accurately considered at every grid pointin the whole computational domain. In this study we improved the existing two-dimensional dispersion-correction finite difference numerical scheme. The present scheme satisfies the local dispersion relationships oftsunamis propagating over a slowly varying topography while using uniform grid size and time step. To verifythe applicability of the improved numerical model, a tsunami due to 1983 East Sea central earthquake issimulated for Korean harbors with the tide gage records such as Sokcho, Mukho, Pohang and Ulsan in the EastSea. Numerical results of the 1983 tsunami are compared with the measured data and the acuracy of the presentnumerical model is evaluated.
Numerical Analysis on the Determination of Pore Pressures inside Rubble Mound Breakwater
Chun, Insik ; Park, Hyunjoo ; Lee, Dalsoo ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 2, 2002, Pages 128~135
Simulation of circulation and Water Qualities on a Partly Opened Estuarine Lake Through Sluice Gate
Suh, Seung Won ; Kim, Jung-Hoon ; , Si-Heung ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 2, 2002, Pages 136~150
To improve the water quality of the recently constructed Siwhaho, sluice gates were operated toalow fre exchange of water with the sea. This estuarine lake connected to the outer sea through narrow gates isaffected mainly by flushing by gate operation and river flows and wind forcing sometimes. As a predicting tolfor the water qualities, a three-dimensional finite volume model CE-QUAL-ICM is incorporated into a finiteelement hydrodynamic model, TIDE3D. In coupling these two diferent modules, a new eror minimizationtechnique is aplied by considering conservation of mass. Model tests for one year after calibration andvalidation using field observation show that eutrophication and other biological changes reach quasi-steady stateafter initial 60 days of simulation, thus it would be necessary to consider moderate ramp up option to removeinitial uncertainties due to cold start option. Sediment-water interaction might not be a concern in the long-termsimulation, since its effect is negligible. Simulated results show the newly applied scheme can be applied withsatisfaction not only for lessening of eutrophic processes in an estuarine lake but also loking for some activecirculation to improve water quality.
Numerical Simulation of Tidal Currents of Asan Bay UsingThree-Dimensional Flow Modeling System(FEMOS)
Jung, Tae Sung ; Kim, Sung Gon ; Kang, See Whan ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 2, 2002, Pages 151~160
A modeling system for three-dimensional flow (FEMOS) has ben developed and applied tosimulate the tidal currents of Asan Bay. The system can consider tidal flats changing with time and uses a finiteelement method that can adapt coastline change effectively. The simulation results for Asan Bay with large tidalflats, shallow water depth and high tidal range showed god agrements with the observed currents of long-termvariations at the medium layer and short-term variations of vertical profiles. Based on the simulated tidalcurents, the horizontal distributions of bottom shear stress were calculated and showed close relation with thechange of bottom topography. The system can be used widely to study coastal circulation in the coastal regionwith complex geography.
Estimation of the Wind Forces of Ieodo Ocean Research Staion by a wind tunnel test
Shim, Jae-seol ; Chun, Insik ; Hwang, Jong-kook ; , Byung-cheol ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 2, 2002, Pages 161~170
A wind tunnel experiment was performed with the design wind speed of 50 m/s to investigate thewind forces of Ieodo Ocean Research Station. The structure portion above water surface was modelled with 1/80scale ratio. The wind force coeficients were determined from the force signals and compared to the results of anumerical study which was separately undertaken. Those results generally agreed wel, and it is assured that theexperimental data can be effectively used in the wind resistant design of the structure. Making use of theexperimental force and pressure coeficients, the wind force and moments acting on the overall upper structureof protype are determined together with the wind pressures on local impervious facilities (main deck, solarpanel and helideck).
Analysis of Wave Transformation and Velocity Fields Including Wave Breaking due to the Permeable Submerged Breakwaters
Kim, Do Sam ; Lee, Kwang Ho ; Kim, Jung Soo ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 2, 2002, Pages 171~181