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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 28, Issue 3 - Jun 2016
Volume 28, Issue 2 - Apr 2016
Volume 28, Issue 1 - Feb 2016
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A Proposal for Criterion of Sudden High Waves in the East Sea
Kim, In-Chul ; Oh, Jihee ; Suh, Kyung-Duck ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 28, issue 3, 2016, Pages 117~123
DOI : 10.9765/KSCOE.2016.28.3.117
One of the major characteristics of the swell-like high waves, which occur in the East Sea mostly in winter with large height and long period, is its suddenness associated with the rapid development of high waves from a calm state of sea. To represent such suddenness, in this study, the term sudden high waves is introduced. To propose the criterion of sudden high waves, comparisons were made between the wave measurement data at Gangneung and Wangdolcho for eight years from 2005 and the record of marine accidents and property damage on the coast of Gangwon-do Province and Gyeongsangbuk-do Province during the same period. It was found that most of the accidents occurred when
was approximately greater than the top 20% or
, which is therefore proposed as the criterion of sudden high waves. The used variable represents the rate of increase of the wave energy in one wavelength, including not only height and period but also suddenness of high waves.
Experimental Investigation on the Change of Stability Coefficient of Tetrapod According to Difference in Density
Lee, Dal Soo ; Oh, Sang-Ho ; Cho, Bong Suk ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 28, issue 3, 2016, Pages 124~131
DOI : 10.9765/KSCOE.2016.28.3.124
In this study, a physical experiment was performed to investigate the change in the stability coefficient, defined by Hudson equation, for the tetrapod of different specific densities. The experiment was carried out once (with no repetition) for a rubble mound breakwater with 1:1.5 slope. In this experiment, the stability coefficient for the high-density tetrapod was greater than that for the normal-density tetrapod. This indicates variability of the stability coefficient according to change in the density of tetrapod. Further experiments and detailed analysis are required to investigate the effect of the density on the stability coefficient of tetrapod.
Regular Waves-induced Seabed Dynamic Responses around Submerged Breakwater
Lee, Kwang-Ho ; Ryu, Heung-Won ; Kim, Dong-Wook ; Kim, Do-Sam ; Kim, Tae-Hyung ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 28, issue 3, 2016, Pages 132~145
DOI : 10.9765/KSCOE.2016.28.3.132
In case of the seabed around and under gravity structures such as submerged breakwater is exposed to a large wave action long period, the excess pore pressure will be generated significantly due to pore volume change associated with rearrangement soil grains. This effect will lead a seabed liquefaction around and under structures as a result from decrease in the effective stress. Under the seabed liquefaction occurred and developed, the possibility of structure failure will be increased eventually. In this study, to evaluate the liquefaction potential on the seabed quantitatively, numerical analysis was conducted using the expanded 2-dimensional numerical wave tank model and the finite element elasto-plastic model. Under the condition of the regular wave field, the time and spatial series of the deformation of submerged breakwater, the pore water pressure (oscillatory and residual components) and pore water pressure ratio in the seabed were estimated.
Numerical Analysis on Self-Burial Mechanism of Submarine Pipeline with Spoiler under Steady Flow
Lee, Woo Dong ; Hur, Dong Soo ; Kim, Han Sol ; Jo, Hyo Jae ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 28, issue 3, 2016, Pages 146~159
DOI : 10.9765/KSCOE.2016.28.3.146
This study used Navier-Stokes Solver(LES-WASS-2D) for analyzing hydrodynamic characteristics with high order in order to analyze self-burial mechanism of pipeline with spoiler under steady flow. For the validity and effectiveness of numerical model used, it was compared and analyzed with the experiment to show flow characteristics around the pipeline with and without the spoiler. And the hydraulic(flow, vortex, and pressure) and force characteristics were numerically analyzed around the pipeline according to the incident velocity, and shape and arrangement of spoiler. Primarily, if the spoiler is attached to the pipeline, the projected area is increased resulting in higher flow velocity toward the back and strong vortex caused by wake stream in the back. Secondly, the spoiler causes vertically asymmetric flow and vorticity fields and thus asymmetric pressure field. It increases the asymmetry of force on the pipe and thus develops large downward fluid force. Both of them are the causes of selfburying of the pipeline with spoiler.
Estimation of Net Flux of Water Mass and Tidal Prism at a Tidal Entrance through Bottom Tracking with ADCP
Yang, Su-Hyun ; Kim, Yong-Muk ; Hwang, Kyu-Nam ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 28, issue 3, 2016, Pages 160~170
DOI : 10.9765/KSCOE.2016.28.3.160
In this study, the bottom tracking observation in the tidal entrance within Mokpo coast is performed using ADCP in order to estimate net flux of water mass and tidal prism. First of all, observed rawdata was conducted coordinate rotation considering rotation of the cross-section in order to derive the predominant velocity component. And observed rawdata is converted into Sigma coordinate with normalization and blank zone data near the water surface and bottom is interpolated using von-Karman equation. Net flux of water mass is calculated quantitively from the interpolated data, calculated results show that these represent well characteristic of ebb superiority at Mokpo coast as well as change of net flux of water mass with tide. Also, by complementing the definition of tidal prism proposed in past studies, the definition of tidal prism including tidal condition was re-established. Based on the new definition, tidal prism at a tidal entrance using bottom tracking data with ADCP is estimated quantitively for the first time domestically. The results are compared with those for results of previous study, calculated results were in good agreement with previous studies.
Estimation and Comparative Analysis on the Distribution Functions of Air and Water Temperatures in Korean Coastal Seas
Cho, Hong-Yeon ; Jeong, Shin-Taek ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 28, issue 3, 2016, Pages 171~176
DOI : 10.9765/KSCOE.2016.28.3.171
The distribution shapes of air and water temperatures are basic and essential information, which determine the frequency patterns of their occurrence. It is also very useful to understand the changes in long-term air and water temperatures with respect to climate change. The typical distribution shapes of air and water temperatures cannot be well fitted using widely used/accepted normal distributions because their shapes show multimodal distributions. In this study, Gaussian mixture distributions and kernel distributions are suggested as the more suitable models to fit their distribution shapes. Based on the results, the tail shape exhibits different patterns. The tail is long in higher temperature regions of water temperature distribution and in lower temperature regions of air temperature distribution. These types of shape comparisons can be useful to identify the patterns of long-term air and water temperature changes and the relationship between air and water temperatures. It is nearly impossible to identify change patterns using only mean-temperatures and normal distributions.