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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 22, Issue 6 - Dec 2010
Volume 22, Issue 5 - Oct 2010
Volume 22, Issue 4 - Aug 2010
Volume 22, Issue 3 - Jun 2010
Volume 22, Issue 2 - Apr 2010
Volume 22, Issue 1 - Feb 2010
Selecting the target year
Construction of Tsunami Inundation Map for Real-Time Quantitative Response
Bae, Jae-Seok ; Yoon, Sung-Bum ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 22, issue 5, 2010, Pages 287~294
In this study, a method to construct tsunami inundation map corresponding to the earthquake location and magnitude was proposed for tsunami real-time quantitative response. This proposed procedure can be introduced as in the followings: Potential tsunami source locations expected to cause damage in an interested area was identified. And numerical simulations were performed for various earthquake magnitudes. Based on numerical simulation results, inundation maps were constructed according to each source location and magnitude of tsunami generating earthquake. In this study, inundation maps for Imwon harbor were constructed for the 11 source locations and 7 earthquake magnitudes on a trial basis.
Estimation of Erosion Damage of Armor Units of Rubble Mound Breakwaters Attacked by Typhoons
Kim, Seung-Woo ; Suh, Kyung-Duck ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 22, issue 5, 2010, Pages 295~305
Although the rubble mound breakwaters in Korea have been damaged by typhoons almost every year, quantification of erosion of armor block have seldomly been made. In this paper, the damage of armor units is standardized by the relative damage. In the case where the number of damaged units is reported, it is divided by the total number of units to calculate the relative damage. In the case where the rehabilitation cost is reported, the relative damage is calculated by using its relationship with the present value of the past rehabilitation cost. The relative damage is shown to have strong correlations with the typhoon parameters such as nearest central air pressure and maximum wind speed at each site. On the other hand, the existing numerical methods for calculating the cumulative damage are compared with hydraulic model tests. The method of Melby and Kobayashi (1998) is shown to give a reasonable result, and it is used to calculate the relative damage, which is compared with the measured damage. A good agreement is shown for the East Breakwater of Yeosu Harbor, while poor agreement is shown for other breakwaters. The poor agreement may be because waves of larger height than the design height occurred due to strong typhoons associated with climate change so that the relative damage increased during the last several decades.
Analysis on the Change of Wave Behaviour Due to Installation of Offshore Wind Turbine Foundations
Kim, Ji-Young ; Kang, Keum-Seok ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 22, issue 5, 2010, Pages 306~315
As developing the large-scale offshore wind farm is expected, the preliminary environmental impact assessment is very essential. In this study, the wave hindcast model is verified based on observed data at the coast around Wido which is among the candidate sites for developing the offshore wind farm. In addition, the effect of the wind turbine foundations on wave height is analyzed when total 35 wind turbines including monopile foundations of 5 m in diameter are installed. Calculation result of significant wave height is in good accord with observed data since the RMS error is 0.35 m. Moreover, it is found that the presence of the wind turbine foundations hardly affects wave height as wave damping ratio is less than 1%.
Variation Pattern Analysis on the Air and Surface Water Temperatures of the Yellow Sea Monitoring Buoy
Cho, Hong-Yeon ; Jeong, Jin-Yong ; Shim, Jae-Seol ; Kim, Seon-Jeong ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 22, issue 5, 2010, Pages 316~325
Harmonic analyses are carried out in order to obtain the major frequency components of the air temperature (AT) and surface water temperature (SWT) data monitored in the Middle Area of the Yellow Sea (Yellow Sea monitoring buoy). The analysis shows the annual and semi-annual components are predominant and the higher frequency components are relatively weak with contribution to the short fluctuations, i.e. below
, in the AT and SWT. The standard deviation of the AT residual is 2.4 times larger than that of the SWT residual and the occurrence frequency distributions of the AT and SWT residual components are both closely fitted to a normal-distribution function. The variation pattern on the AT-SWT plane forms the clear continuous hysteresis loop in anti-clockwise direction which is composed of the AT-SWT rising period, AT-SWT falling period, and the constant SWT period in winter season.
Structural Re-design of Seawater Pump Impeller Shaft
Cho, Kyu-Nam ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 22, issue 5, 2010, Pages 326~332
Critical response of seawater pump impeller shaft structure to various exciting loads is a fundamental factor in re-designing of the structure after its functional failure. In this paper, a typical case of the shaft structure's failure is investigated for re-designing purposes. Failure causes of interest are excessive bending moment, fatigue loads and dynamic resonance due to relevant motor rotation and unbalancing of the rotation loads. Static analyses of shaft structure under the conditions of concerned loads are carried out, followed by a dynamic investigation of the effects of resonance between the shaft and the motor on the structure. The relevant structural analyses are carried out using the Finite Element Methods combined with ANSYS code. Based on these, the primary cause for the shaft's structural failure is obtained. It is found that the change of the bending stiffness of the shaft is the primary concern in the re-designing process. A guideline for the re-design process of the seawater pump shaft structure is established, and a re-design scheme of the structure is proposed.
Numerical Modeling of Ebb-Dominant Tidal Flow in the Mokpo Coastal Zone
Jung, Tae-Sung ; Choi, Jong-Hwa ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 22, issue 5, 2010, Pages 333~343
In Mokpo coastal zone, the characteristics showing ebb-dominant tidal flow was confirmed by analysis of observed tide and tidal currents, Physical factors occurring ebb-dominant flow were reviewed. Influence of critical depth for drying, bottom shear stress, coastal reclamation, tidal amplitude, nonlinear tide, and eddy viscosity on the change of ebb-dominant flow was investigated by applying a two-dimensional circulation model. The simulation results for a variety of conditions showed that eddy viscosity and critical depth for drying does little or no impact on the generation of asymmetric flow. Strong bottom friction stress makes ebb-dominant flow clearly. Change of tidal flat into land swells ebb- dominant flow, and change of tidal flat into sea disappears ebb-dominant flow. Nonlinear tides play a decisive role in the generation of asymmetrical tidal flow. Non-linear tides should be included in the open boundary conditions of hydrodynamic modeling in the Mokpo coastal zone.
Uncertainty Analysis of the Net Flow Discharge and Diffusion Model in Gyeonggi Bay and Han River Estuary
Kim, Jeong-Dae ; Jeong, Shin-Taek ; Cho, Hong-Yeon ; Kim, Tae-Heon ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 22, issue 5, 2010, Pages 344~351
Uncertainty analysis on the net flow discharge (NFD) influencing the long-term material transport and the simulation results of the salinity and COD concentration distribution using the MIKE21 diffusion model in Gyeonggi bay and Han-River estuary is carried out. The NFD flowing the Gyodongdo - Seokmodo channel via the North channel of Ganghwado is estimated about 97% of the total NFD and the NFD of the Yeomha channel is estimated as only
. On the other hand, the uncertainty defined as the difference by the different time-scale data input is analysed by the comparison of the model simulation result of the salinity and COD concentration distribution. One is computed based on the daily river flow data, and the other is computed based on the monthlymean river flow data. The results show that the salinity and COD concentration differences are about -10~20 psu and
during the summer season having a high flow discharge in Yeomha channel, respectively. The difference is clearly negligible in the open sea area.