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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 26, Issue 6 - Dec 2014
Volume 26, Issue 5 - Oct 2014
Volume 26, Issue 4 - Aug 2014
Volume 26, Issue 3 - Jun 2014
Volume 26, Issue 2 - Apr 2014
Volume 26, Issue 1 - Feb 2014
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Effect of Wall Thickness of Perforated Wall with Vertical Slits on Wave Reflection and Transmission
Kwon, Kab Keun ; Lee, Jong In ; Yoon, Sung Bum ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 26, issue 6, 2014, Pages 343~351
DOI : 10.9765/KSCOE.2014.26.6.343
The reflection and transmission coefficients of waves due to perforated wall are mainly determined by both the porosity and wall thickness of the perforated wall and the period and nonlinearity of incident waves. Among them the wall thickness is very important because it affects the head loss coefficient and the inertia length of the wall. However, by employing the head loss coefficient derived for sharp crested orifice, the previous researches have neglected, or incorrectly considered the effect of wall thickness on the head loss coefficient. Even though it is considered, the effect of the inertia length is neglected in some empirical formulae. Thus, the effect of wall thickness on the reflection and transmission coefficients of waves is not properly considered. In this study comprehensive experiments are conducted for the perforated walls with various thicknesses, and the results are compared with those predicted by the empirical formulae. As a result it is found that the existing formulae can not properly consider the effect of wall thickness, and it is confirmed that a new formula which can correctly consider the effect of wall thickness on the head loss coefficient is necessary.
Appearance of Tide-surge Interaction along the West/South Coasts
Kang, Ju Whan ; Kim, Yang-Seon ; Yoon, Young-Kwan ; Shim, Jae-Seol ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 26, issue 6, 2014, Pages 352~358
DOI : 10.9765/KSCOE.2014.26.6.352
Hourly tide-gauge data at 10 tide stations along the West/South coasts were analysed statistically for tidesurge interaction. Interactions were found at all stations except Busan, prominently at the western tip of the South coast near Mokpo and Wando. A well-known interaction pattern which occurs at flood tide was found rarely at domestic coasts, while another pattern of the tide-modulated surge which occurs at low tide was detected frequently. In addition, a new interaction pattern which occurs at ebb tide is discovered. This pattern is found at Mokpo where the ebb dominance is prominent. Finally, the skew surge could be considered as a tool coping with such interactions.
An Optimization for Flow Control Butterfly Valve using Grey Relational Analysis
Lee, Sang Beom ; Lee, Dong Myung ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 26, issue 6, 2014, Pages 359~366
DOI : 10.9765/KSCOE.2014.26.6.359
This paper considered optimization method of appending a shape on a disc in an attempt to improve core functions, which are inherent in flow characteristics. The paper also verifies the optimization method of appendage shape with a Class 150 200A Butterfly valve. Then the design of experiment (DOE) with an orthogonal array is performed to analyze the effect of form parameters by grey relational analysis and analysis of mean (ANOM). And this study sets flow coefficient as an object functions for optimization, and the conventional disc model and the optimal appendage shape on disc model are compared by computational fluid analysis. The paper concludes that an optimal appendage shape on disc model achieves wider usability by a wider operating range.
Simulation of Solitary Wave-Induced Dynamic Responses of Soil Foundation Around Vertical Revetment
Lee, Kwang-Ho ; Yuk, Seung-Min ; Kim, Do-Sam ; Kim, Tae-Hyeong ; Lee, Yoon-Doo ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 26, issue 6, 2014, Pages 367~380
DOI : 10.9765/KSCOE.2014.26.6.367
Tsunami take away life, wash houses away and bring devastation to social infrastructures such as breakwaters, bridges and ports. The targeted coastal structure object in this study can be damaged mainly by the tsunami force together with foundation ground failure due to scouring and liquefaction. The increase of excess pore water pressure composed of oscillatory and residual components may reduce effective stress and, consequently, the seabed may liquefy. If liquefaction occurs in the seabed, the structure may sink, overturn, and eventually increase the failure potential. In this study, the solitary wave was generated using 2D-NIT(Two-Dimensional Numerical Irregular wave Tank) model, and the dynamic wave pressure acting on the seabed and the estimated surface boundary of the vertical revetment. Simulation results were used as an input data in a finite element computer program(FLIP) for elasto-plastic seabed response. The time and spatial variations in excess pore water pressure, effective stress, seabed deformation, structure displacement and liquefaction potential in the seabed were estimated. From the results of the analysis, the stability of the vertical revetment was evaluated.
Runup Characteristics with the Variations of Wave Spectral Shape
Park, Seung Min ; Yoon, Jong Tae ; Jeong, Weon Mu ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 26, issue 6, 2014, Pages 381~387
DOI : 10.9765/KSCOE.2014.26.6.381
Recently the large-height swell-like waves generated in the eastern coast of South Korea have been observed frequently. The characteristics of the runup and overtopping of the large-height swell-like waves formed in deep water and attack the coast, causing damages to both lives and facilities have been studied. The correlation between spectral shape parameters and significant wave height has been investigated by analyzing long term wave spectrum data. Numerical runup experiments using MIKE21 BW Module were performed with
, additional shape parameter, and identified the variations and characteristics of runup heights with respect to the variations of spectral shape.
Numerical Simulation of Coastal Urban Inundation due to Storm Surge and Rainfall
Kim, Gun Hyeong ; Pyo, Chang Kyu ; Yoon, Sung Bum ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 26, issue 6, 2014, Pages 388~396
DOI : 10.9765/KSCOE.2014.26.6.388
In this study, numerical simulations are conducted for the inundations due to storm surge and rainfall at Masan City of Korea where severe damages occurred by the typhoon Maemi. A coupled numerical model which can deal with various flow patterns such as storm surge, rainfall and sewer flows is employed. The numerical results show that the inundation area and depth increase significantly when the combined effects of storm surge and rainfall are considered in comparison with those obtained without a rainfall effect. Further numerical simulations are conducted to evaluate the performance of the sea wall being constructed for the coastal defence. The results show that the maximum inundation depths decrease when the sea wall is constructed. However, the duration of inundation becomes longer, because the rainwater on the ground cannot be discharged easily to the sea due to the presence of the sea wall.
Review of the Improvement of the Estimation Method of Harbor Tranquility
Jeong, Weon Mu ; Ryu, Kyong-Ho ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 26, issue 6, 2014, Pages 397~404
DOI : 10.9765/KSCOE.2014.26.6.397
In Korea, harbor tranquility is generally estimated by using both methods of investigating harbor calmness under abnormal wave condition and evaluating the harbor serviceability. The efficiency of the former method is questionable as the tranquility of a harbor is judged by a wave height criterion that is arbitrarily determined without rational basis. In case of the latter method, the utilization rate of a harbor is estimated by using the exceedance probability of wave height or the distribution of wave heights and periods that is obtained from longterm measured or hindcasted wave data. Use of long-term data is desirable in order to guarantee the accuracy of the exceedance probability. Meanwhile, the criterion for determining maximum allowable wave height for cargo handling works is too simple and has limitations for being used in an actual field condition. Problems of existing method for estimating harbor tranquility were verified by the wave observation data in Busan New Port. And the importance of the field observation data was emphasized. It is necessary to perform long-term wave monitoring inside and outside of major ports in Korea in order to establish more advanced standard for evaluating harbor tranquility based on such observed wave data.
Classification and Performance Evaluation Methods of an Algal Bloom Model
Cho, Hong-Yeon ; Cho, Beom Jun ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 26, issue 6, 2014, Pages 405~412
DOI : 10.9765/KSCOE.2014.26.6.405
A number of algal bloom models (red-tide models) have been developed and applied to simulate the redtide growth and decline patterns as the interest on the phytoplankton blooms has been continuously increased. The quantitative error analysis of the model is of great importance because the accurate prediction of the red-tide occurrence and transport pattern can be used to setup the effective mitigations and counter-measures on the coastal ecosystem, aquaculture and fisheries damages. The word "red-tide model" is widely used without any clear definitions and references. It makes the comparative evaluation of the ecological models difficult and confusable. It is highly required to do the performance test of the red-tide models based on the suitable classification and appropriate error analysis because model structures are different even though the same/similar words (e.g., red-tide, algal bloom, phytoplankton growth, ecological or ecosystem models) are used. Thus, the references on the model classification are suggested and the advantage and disadvantage of the models are also suggested. The processes and methods on the performance test (quantitative error analysis) are recommend to the practical use of the red-tide model in the coastal seas. It is suggested in each stage of the modeling procedures, such as verification, calibration, validation, and application steps. These suggested references and methods can be attributed to the effective/efficient marine policy decision and the coastal ecosystem management plan setup considering the red-tide and/or ecological models uncertainty.