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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 25, Issue 6 - Dec 2013
Volume 25, Issue 5 - Oct 2013
Volume 25, Issue 4 - Aug 2013
Volume 25, Issue 3 - Jun 2013
Volume 25, Issue 2 - Apr 2013
Volume 25, Issue 1 - Feb 2013
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Evaluation of Vibration Characteristics of Caisson-Type Breakwater Using Impact Vibration Tests and Validation of Numerical Analysis Model
Yi, Jin-Hak ; Park, Woo-Sun ; Lee, So-Young ; Kim, Jeong-Tae ; Seo, Choon-Gyo ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 25, issue 1, 2013, Pages 1~10
DOI : 10.9765/KSCOE.2013.25.1.1
In this study, impact vibration tests are applied to analyze the vibration characteristics of caisson-type breakwater, and the results obtained from vibration tests are compared with numerical simulation results considering fluid-soil-structure interaction effects to verify the feasibility of a numerical analysis model. It is found that natural frequencies are reduced as amount of 1.7-4.3% after additional parapet structure is added to increase the height of breakwater, and the same results was observed from the numerical simulation study. Through the comparison, it was verified that the vibration tests and numerical simulation study can be applied to evaluate the vibration characteristics of caisson-type breakwater.
Estimation of Probability Distribution Functions for Water Temperature Data in Korean Coasts
Jeong, Shin Taek ; Cho, Hongyeon ; Ko, Dong Hui ; Oh, Nam Sun ; Son, Kyeong-Pyo ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 25, issue 1, 2013, Pages 11~19
DOI : 10.9765/KSCOE.2013.25.1.11
As the temperature data show a distribution pattern with a number of peaks, assumption of normal distribution will result in a serious bias in the analysis. In this study, the Gaussian Mixture Distribution (GMD), a type of bimodal distribution, is presumed as a frequency distribution for the water temperature, in order to estimate the optimal parameter and to carry out the relation analysis between the optimal parameter and the basic statistical information such as mean and variance on the data. By the way, an estimation formulae to compute the frequency distribution of the data is developed by computing the parameters of GMD (i.e.
) by means of the major characteristic values, such as mean, standard deviation and skewness of the data. The formulae shows an excellent coincidence with the result from the observation data, in the RMS limit accuracy of 5%.
Numerical Analysis on Settlement Behavior of Seabed Sand-Coastal Structure Subjected to Wave Loads
Kang, Gi-Chun ; Yun, Seong-Kyu ; Kim, Tae-Hyung ; Kim, Dosam ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 25, issue 1, 2013, Pages 20~27
DOI : 10.9765/KSCOE.2013.25.1.20
Seabed settlement underneath a coastal structure may occur due to wave loading generated by storm surge. If the foundation seabed consists of sandy soil, the possibility of the seabed settlement may be more susceptible because of generation of residual excess pore-water pressure and cyclic mobility. However, most coastal structures, such as breakwater, quay wall, etc., are designed by considering wave load assumed to be static condition as an uniform load and the wave load only acts on the structure. In real conditions, however, the wave load is dynamically applied to seabed as well as the coastal structure. In this study, therefore, a real-time wave load is considered and which is assumed acting on both the structure and seabed. Based on a numerical analysis, it was found that there exists a significant effect of wave load on the structure and seabed. The deformation behavior of the seabed according to time was simulated, and other related factors such as the variation of effective stress and the change of effective stress path in the seabed were clearly observed.
Directional Asymmetry Parameter and Maximum Spreading Parameter of Random Waves Incident on a Planar Slope
Jung, Jae-Sang ; Lee, Changhoon ; Cho, Yong-Sik ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 25, issue 1, 2013, Pages 28~33
DOI : 10.9765/KSCOE.2013.25.1.28
Multidirectional random waves that obliquely approach the shore were found to become directionally asymmetric due to refraction. The directional asymmetry was expressed in terms of the asymmetry parameter which is related to the maximum spreading parameter (
). In this study, we calculate variation of both the asymmetry and maximum spreading parameters at different water depths for various cases of incident wave angles and maximum spreading parameters in deep water. These values are different from Goda and Suzuki (1975) who neglected directional asymmetry of waves. In calculating directional asymmetry and maximum spreading parameters, we use the JONSWAP spectrum (Hasselmann et al., 1973) and Lee et al.'s (2010) directional distribution function. The processes and results are nondimensionalized with significant wave height, peak frequency and peak wave length in deep water.
Relationship Analysis on the Monitoring Period and Parameter Estimation Error of the Coastal Wave Climate Data
Cho, Hongyeon ; Jeong, Weon-Mu ; Jun, Ki Cheon ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 25, issue 1, 2013, Pages 34~39
DOI : 10.9765/KSCOE.2013.25.1.34
In this study, the quantitative analysis and pattern analysis of the error bounds with respect to recording period were carried out using the wave climate data from coastal areas. Arbitrary recording periods were randomly sampled from one month to six years using the bootstrap method. Based on the analysis, for recording periods less than one year, it was found that the error bounds decreased rapidly as the recording period increased. Meanwhile, the error bounds were found to decrease more slowly for recording periods longer than one year. Assuming the absolute estimate error to be around 10% (
) for an one meter significant wave height condition, the minimum recording period for reaching the estimate error for Sokcho and Geoje-Hongdo stations satisfied this condition with over two years of data, while Anmado station was found to satisfy this condition when using observational data of over three years. The confidence intervals of the significant wave height clearly show an increasing pattern when the percentile value of the wave height increases. Whereas, the confidence intervals of the mean wave period are nearly constant, at around 0.5 seconds except for the tail regions, i.e., 2.5- and 97.5-percentile values. The error bounds for 97.5-percentile values of the wave height necessary for harbor tranquility analysis were found to be 0.75 m, 0.5 m, and 1.2 m in Sokcho, Geoje-Hongdo, and Anmado, respectively.