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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 14, Issue 4 - Sep 2002
Volume 14, Issue 3 - Sep 2002
Volume 14, Issue 2 - Jun 2002
Volume 14, Issue 1 - Mar 2002
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Countermeasures for Beach Erosion around Fishing Port in East Sea of Korea
Kim, Kyu Han ; Back, Jong Dai ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 4, 2002, Pages 247~259
Most of fishing ports on the east coast of Korea have constructed around sand beach. Such fishingport structure had caused important efect in erosion of neighborhood sand beach.In order to solve the problems,we have to understand the mechanism through estimations and accurate reproduction beach erosion. Simulata-neously, we have to devise a suitable countermeasure for beach erosion to the object coast. This study suggestseconomically substantial countermeasure for beach erosion around the fishing port and investigates, the preventiveeffects using a numerical simulation technique.
Finite Element Analysis for Multiple Floating Breakwaters
Jeong, Shin Taek ; Park, Woo Sun ; Lee, Ho Chan ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 4, 2002, Pages 257~264
This paper is concerned with the analysis of wave reflection and transmision from multiplefloating breakwaters. Linear potential theory was used for modeling wave field, and the behaviors of the floatingbreakwaters was represented as linearized equation of motions. The boundary value problem for the wave fieldwas discretized by Galerkin technique. The radiation condition at infinity was modeled as infinite elementsdeveloped by Park et al.(1991). The validation of the developed model was given through the comparison withhydraulic experimental data conducted by Park et al.(20). The possibility for the aplication of multiplefloating breakwaters was also discussed based on the numerical experiments.
Wave Absorbing Characteristics of a Horizontal Submerged Punching Plate
Cho, Il-Hyoung ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 4, 2002, Pages 265~273
In this paper, wave absorbing characteristics of a horizontal submerged punching plate areinvestigated throughout the calculation and the experiment. The punching plate with the aray of circular holescan force the flow to separate and to form edies of high vorticity and cause significant energy loss. As ananalytic tol, the linear water wave theory and the eigenfunction expansion method is applied. Darcy's law thatthe normal velocity of the fluid passing through the punching plate is linearly proportional to the pressurediference between two sides of the punching plate is asumed. The proportional constant called the porouscoefficient is deply dependent to the porosity. To obtain the relationship betwen the porosity and the porouscoefficient, the systematic model test for the punching plates with 6 different porosities is conducted at 2-dimensional wave tank. It is found that the porous coeficient is linearly proportional to the porosity(b=57.63P-0.9717 .. It is also noted that the optimal porosity value is near P=0.1 and the optimal range of submergence depthis d/h 0.2 within entire frequency range.
Analysis of Bragg Reflection of Cnoidal Waves with Boussinesq Equations
Cho, Yong-Sik ; Jung, Jae-Sang ; Lee, Jong-In ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 4, 2002, Pages 274~281
Numerical analysis for the Bragg reflection due to a sinusoidally and a doubly-sinusoidally varyingseabeds was performed by using a couple of ordinary diferential equations derived from the Boussinesqequations. Incident waves are a train of cnoidal waves. The effects of the dispersion and shape of seabed wereinvestigated. It is shown that the reflection of a sinusoidally varying seabed is enhanced by increasing thedispersion and the amplitude of a seabed. The reflection of waves over a doubly-sinusoidally varying seabed canalso be enhanced by increasing the amplitude of seabed decreasing the diference of wave numbers of seabedcomponents.
Investigation of Importance of Evanescent Modes in Predicting the Transformation of Water Waves by the Linear Wave Theory: 1. Derivation of Equations of Wave Energy
Lee, Changhoon ; Cho, Yong-Sik ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 4, 2002, Pages 282~285
The magnitude of evanescent modes in terms of dynamics is investigated in case that thetransformation of water waves is predicted using the linear wave theory. In other words, derivation is made ofboth the kinetic and potential wave energies of evanescent modes as wel as propagating modes. The evanescentmodes consist of compound components of propagating and evanescent modes, those of identically equalevanescent modes, and those of identically diferent evanescent modes. The wave energy per a horizontaldistance decreases exponentially with the distance.
The Effects of Stress and Time History on Pore Pressure Parameter of Overconsolidated clay
Kim, Soosam ; Kim, Byungil ; Han, Sangjae ; Shin, Hyunyoung ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 4, 2002, Pages 286~294
This study investigated the effects of stress and time history of overconsolidated clayey soils onpore pressure parameter, A. Laboratory tests were carried out under the conditions of both varying stres and timehistory. The stres history is classified into (i) rotation angle of stress path, (ii) overconsolidation ratio, and (iii)magnitude of length of recent stres path. The time history is divided into (i) loading rate of recent stress path and(ii) rest time. Pore presure parameters are different both in the magnitude and trend with the rotation angle,depending on the magnitude of overconsolidation ratio but not in a trend. In addition, the pore pressureparameters have no effects on the magnitude of length of recent stres path except the level of initialy smalstrain, while loading rates of recent stress path have efects on it. Finaly, the pore presure parameters ofoverconsolidated clays increase with the existence of the rest time, until either the deviator stress exceeds 70 Paor the strain up to 0.1%.
Stratification and DO Concentration Change in Chinhae-Masan Bay
Cho, Hong Yeon ; Chae, Jang Won ; Chun, Si Young ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 4, 2002, Pages 295~307
Water temperature, salinity, and DO concentration were measured verticaly in the Chinhae-MasanBay over the course of 1 year. The characteristics of the stratification were analysed using the measured watertemperature and salinity data. The vertical DO concentration changes were also analysed through considerationof the degre of stratification and the level of sediment pollution. The results of the analyses show that thethermal stratification apears just before April and disapears after October. The salinity differences between thesurface and the bottom were 3.9. , 9.3. , 4.3. in April, August, and October, respectively. The DOconcentration change a27(veraged over water depth was 2.6(mg/L) in April; 8.3(mg/L) in June; 5.9(mg/L) inAugust; 7.2(mg/L) in September; and 4.4(mg/L) in October. The DO concentration changes were closely relatedto the levels of contamination and also to the effect of the mass-transfer inhibition between the surface andbottom layers due to the thermal and density stratification.
Applicability of the Korteweg-de Vries Equation for Descriptionof the Statistics of Freak Waves
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 4, 2002, Pages 308~318
The requirements to the numerical model of wind-generated waves in shalow water are discusedin the framework of the Korteweg-de Vries equation. The weakness of nonlinearity and dispersion required forthe Korteweg-de Vries equation applicability is considered for fully developed sea, non-stationary wind wavesand swell, including some experimental data. We note for suficient evaluation of the freak wave statistics it isnecesary to consider more than about 10,0 waves in the wave record, and this leads to the limitation of thenumerical domain and number of realizations. The numerical modelling of iregular water waves is made todemonstrate the posibility of effective evaluation of the statistical properties of freak waves with heights equalto 2.2.3 significant wave height.
Environmental Assessment of Cr6+ Occurring in Stabilizing Processes of Soft Sea-Bottom using Cement Stabilizers
Oh, Recently, the injection of cement stabilizer is used as one of ways to improve soft sea-botom.However, this method makes an argument with Cr6+subject to emerge to the seawater from the cement stabilizer.To investigate the amount of Cr6+field measurements were carried out in Ochun harbor of Chunsoo Bay. Theanalysis shows the amount of Cr6+in the seawater met the demand of environmental criterion. ; Kim, Kyung Tae ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 14, issue 4, 2002, Pages 319~321
Recently, the injection of cement stabilizer is used as one of ways to improve soft sea-botom.However, this method makes an argument with Cr6+subject to emerge to the seawater from the cement stabilizer.To investigate the amount of Cr6+field measurements were carried out in Ochun harbor of Chunsoo Bay. Theanalysis shows the amount of Cr6+in the seawater met the demand of environmental criterion.