Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Society of Coastal and Ocean Engineers
Journal Basic Information
Journal DOI :
Korean Society of Coastal and Ocean Engineers
Editor in Chief :
Volume & Issues
Volume 27, Issue 6 - Dec 2015
Volume 27, Issue 5 - Oct 2015
Volume 27, Issue 4 - Aug 2015
Volume 27, Issue 3 - Jun 2015
Volume 27, Issue 2 - Apr 2015
Volume 27, Issue 1 - Feb 2015
Selecting the target year
Relationship between Electrical Resistivity and Hydraulic Resistance Capacity measured by Rotating Cylinder Test
Kim, Young Sang ; Jeong, Shin Hyun ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 1, 2015, Pages 1~8
DOI : 10.9765/KSCOE.2015.27.1.1
Recently, constructions of coastal structure including wind turbine structure have increased at southwest shore of Korea. There is a big difference of tide which rage from 3.0 m to 8.0 m at south and wet shore of Korea, respectively. In such ocean circumstance, large scour may occur due to multi-directional tidal current and transverse stress of the wind. therefore scour surrounding wind turbine structure can make system unsafe due to unexpected system vibration. In this study, hydraulic resistance capacity, i.e., critical velocity and critical shear stress, was evaluated by RCT. Uni-directional and bi-directional hydraulic resistance capacities of the samples which were consolidated by different preconsolidation pressures were correlated with soil resistivities of same samples. According to the correlation, it is possible to estimate hydraulic resistance capacity from electrical resistivity of soil. Through the updating the correlation for various soil types, it is expected that the hydraulic resistance capacity of whole construction site will be simply determined from the electrical resistivity.
Remediation of Muddy Tidal Flat using Porous Pile
Kim, Kyunghoi ; Lee, In-Cheol ; Kang, Yoon-Koo ; Hibino, Tadashi ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 1, 2015, Pages 9~13
DOI : 10.9765/KSCOE.2015.27.1.9
Field experiment were carried out to investigate the formation of ground water flow and remediation of muddy tidal flat by installation of porous pile at the tidal flat of brackish river located in Hiroshima City, Japan. After the installation of porous pile, the concentrations of Dissolved Oxygen (DO) in the interstitial water in the porous pile increased with maximum concentration of 4 mg/L due to a formation of groundwater flow. It was observed that a increase in Oxidation Reduction Potential (ORP) and a decrease in Ignition Loss (IL) in the porous pile site and these must be caused by the increase of dissolved oxygen in the interstitial water. From these results obtained above, it is concluded that the porous pile is an effective technology for remediation of muddy tidal flats.
Evaluation of Effective Working Days in a Harbor Considering Harbor Resonance and Moored Ship Motion
Kwak, Moonsu ; Moon, Yongho ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 1, 2015, Pages 14~24
DOI : 10.9765/KSCOE.2015.27.1.14
This study proposed an estimation method of allowable wave height for loading and unloading of the ship and evaluation of effective working days considering moored ship motion that is affected by sip sizes, mooring conditions, wave periods and directions. The method was examined validity by comparison with wave field data at pier
in Pohang New Harbor. The wave field data obtained with wave height of 0.10~0.75 m and wave period of 7~13 s in ship sizes of 800~35,000 ton when a downtimes have occurred. On the other hand, the results of allowable wave height for loading and unloading of the ship in this method have obtained with wave heights of 0.19~0.50 m and wave periods of 8~12 s for ship sizes of 5,000, 10,000 and 30,000 ton. Thus this method well reproduced the field data respond to various a ship sizes and wave periods. And the results of this in Korea are didn't respond to various the ship sizes and wave periods, and we h method tended to decrease in 16~62 percent when have considered long wave, and it is decreased in 0~46 percent when didn't consider long wave than design standards in case of the ship sizes of 5,000~30,000 ton, wave period of 12 s and wave angle of
. The allowable wave heights for loading and unloading of the ship proposed by design standards in Korea have found that overestimated on smaller than 10,000 ton. On the other hand, the rate of effective working days considering ship motion at pier
in Pohang New Harbor reduced in 6.5 percent when compare with the results without considering ship motion.
Typhoon-surge Characteristics in Relation with the Tide-surge Interaction
Kang, Ju Whan ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 1, 2015, Pages 25~37
DOI : 10.9765/KSCOE.2015.27.1.25
Tide-surge interaction during typhoon periods has been analyzed. The quantitative analysis of the Chi-square test shows that the interaction is most prominent at the Southwestern coast whereas the Western and the Southeastern regions are not. Patterns of surge type were divided into two groups, that is, steep type and mild type. Then, the interaction was turned out to be more prominent for mild type data. The weak interaction at the Western region is considered due to negative surges when the south-track typhoons attack. However, the interaction is remarkable when the west-track typhoons attack. The weak interaction at the Southeastern coast is, on the other hand, considered due to abundance of the steep type typhoons. Thus, inundation risk would be so apprehensive at that region because large-scale surge might be caused even at high tide.
Numerical Analysis of the Depression Effect of Hybrid Breaker on the Run Up Height due to Tsunami based on the Modified Leading Depression N (LDN) Wave Generation Technique
Cho, Yong Jun ; Na, Dong Gyu ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 1, 2015, Pages 38~49
DOI : 10.9765/KSCOE.2015.27.1.38
Past study of tsunami heavily relied on the numerical modelling using 2D Boussinesq Eq. and Solitary wave. Lately, based on the fact that numerically simulated run up heights based on solitary wave are somewhat smaller than the measured one, Leading Depression N (LDN) Wave has been elaborated, which can account the advancement of a shore line before tsunami strikes a shore. Thereafter it is reported that more accurate simulation can be possible once LDN is deployed. On the other hand, there were numerous reports indicating that stable LDN wave can't be sustained in the hydraulic model test. These conflicts between the hydraulic model tests and numerical results have their roots on the assumption made in the derivation of Boussinesq type wave model such as that wave nonlinearity is equally balanced with wave dispersiveness. Hence, in the numerical simulation based on the Boussinesq type wave model, wave dispersiveness is inevitably underestimated, especially in deep water. Based on this rationale, we developed the modified methodology for the generation of stable LDN wave in the 3D numerical wave flume, and proceeded to numerically analyze the depression effect of Hybrid Breaker on the run up height due to tsunami using the Navier Stoke Equation. The verification of newly proposed wave model in this study was carried out using the run up height from the hydraulic model test. It was shown that Hybrid Breaker consisting of three water chamber and slope at its front can reduce 13% of run up height for H = 5m, and 10% of run up height for H = 6m.
Experimental Study for Wave Energy Convertor using Floating Light Buoy
Oh, Nam Sun ; Jeong, Shin Taek ; Ko, Dong Hui ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 1, 2015, Pages 50~55
DOI : 10.9765/KSCOE.2015.27.1.50
In this paper, wave energy convertors which convert incident wave energy into electric power using floating light buoy are investigated. One-tenth models of a floating light buoy, straight line and seesaw type electric power plant are manufactured and tested in wave flume. In these systems, we measure the horizontal and vertical slope, generated current and power of buoy with different wave heights and periods. This was confirmed the capability of getting electric power, then we suggest further works to get more efficiency.
The Prediction of Water Temperature at Saemangeum Lake by Neural Network
Oh, Nam Sun ; Jeong, Shin Taek ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 27, issue 1, 2015, Pages 56~62
DOI : 10.9765/KSCOE.2015.27.1.56
The potential impact of water temperature on sea level and air temperature rise in response to recent global warming has been noticed. To predict the effect of temperature change on river water quality and aquatic environment, it is necessary to understand and predict the change of water temperature. Air-water temperature relationship was analyzed using air temperature data at Buan and water temperature data of Shinsi, Garyeok, Mangyeong and Dongjin. Maximum and minimum water temperature was predicted by neural network and the results show a very high correlation between measured and predicted water temperature.
Bore-induced Dynamic Responses of Revetment and Soil Foundation
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 27, issue 1, 2015, Pages 63~77
DOI : 10.9765/KSCOE.2015.27.1.63
Tsunami take away life, wash houses away and bring devastation to social infrastructures such as breakwaters, bridges and ports. The coastal structure targeted object in this study can be damaged mainly by the wave pressure 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 bore was generated using the water level difference, its propagation and interaction with a vertical revetment analyzed by applying 2D-NIT(Two-Dimensional Numerical Irregular wave Tank) model, and the dynamic wave pressure acting on the seabed and the surface boundary of the vertical revetment estimated by this model. Simulation results were used as input data in a finite element computer program(FLIP) for elasto-plastic seabed response. The time and spatial variations in excess pore water pressure ratio, effective stress path, 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.