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 15, Issue 4 - 00 2003
Volume 15, Issue 3 - 00 2003
Volume 15, Issue 2 - 00 2003
Volume 15, Issue 1 - 00 2003
Selecting the target year
Analysis of Chloride Ion Penetration of Marine Concrete Structure
Han, Sang-Hun ; Park, U-Seon ; Kim, Dong-Hyeon ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 15, issue 2, 2003, Pages 71~79
The estimation functions were proposed for calculating diffusion coefficient, chloride binding, andevaporable water. The program estimating chloride ion penetration was developed on the basis of these functionsand the effects of humidity, curing temperature, water-cement ratio, and
on chloride penetration were analyzed.The relative humidity increases the depth of chloride ion penetration and the trend becomes greater with aging.On the contrary, the influence of curing temperature on chloride ion penetraton decreases with aging. By the way,the rise of
in cement increases total chloride concentration on the surface as the bound chloride concentra-tion increases but it decreases total chloride concentration on the inner part as the difusion velocity of frechloride decreases. The fal of water-cement ratio decreases the chloride penetration depth rapidly. Therefore, thereduction of water-cement ratio may be the most effective method for reducing of the stel corrosion by chloridepenetration.
Generation and Maximum Run-up Heights of Cnoidal Waves
Cho, Yong-Sik ; Jeon, Chan-Hoo ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 15, issue 2, 2003, Pages 80~85
This paper describes the generation and maximum run-up heights of cnoidal waves with varying periods by the numerical model. The model solves the Reynolds equations and the k-epsilon equations for the turbulent analysis. To track free surface displacements, the volume of fluid(VOF) method is employed. It is shown that profiles of the numerically generated cnoidal waves agree well with analytical solutions. The computed maximum run-up heights are compared with laboratory measurements and those of the boundary element method. The present model provides more agreeable results to laboratory measurements that the boundary element model.
Reliability Analysis for Fracture of Concrete Armour Units
Lee, Cheol-Eung ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 15, issue 2, 2003, Pages 86~96
A fracture or breakage of the concrete armor units in the primary cover layer of breakwaters is studied by using the reliability analysis which may be defined as the structural stability. The reliability function can be derived as a function of the angle of rotation that represents the rocking of armor units quantitatively. The relative influences of all of random variables related to the material and geometric properties on the fracture of armor units is analyzed in detail. In addition, the probability of failure for the fracture of individual armor unit can be evaluated as a function of the incident wave height. Finally, Bernoulli random process and the allowable fracture ratio may be introduced together in this paper, by which the probability of failure of a breakwater due to the fracture of armor units can be obtained straightforwardly. It is found that the probability of failure of a breakwater due to the fracture of armor units may be varied with the several allowable fracture ratios. Therefore, it should be necessary to consider the structural stability as well as the hydraulic stability for the design of breakwaters with multi-leg slender concrete armor units of large size under wave action in deep water.
Comparative Study for dry-wet Treatment Effect in a Tidal Hydrodynamic Simulation
Seo, Seung-Won ; Kim, Jung-Hoon ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 15, issue 2, 2003, Pages 97~107
In order to evaluate the effect of dry-wet treatment on well developed tidal flats along the complex coastal line in the western part of Korean Peninsula, we adopted a finite element tidal hydrodynamic simulation model, ADCIRC incorporating newly suggested dry-wet option and applied it to Chonbuk coastal area and Keum river estuary. Model comparison with observed current data by RMS error in the Chonbuk area shows very good agreement within 1cm/sec of tidal velocity difference and 3% of error to maximum tidal currents. However there is not seen any significant advantages in dry-wet treatment. For the tidal volume tests in the Keum river estuary, the differences are satisfied within 5% nevertheless of dry-wet treatment but in a near cross section it marks over 20%. However both results are almost same in tidal residual tests. Thus it can be concluded that dry-wet option is not always necessary in the simulation of long-term dispersion analysis.
Analysis of 1-D Dispersion Property of ADCIRC Finite Element Model for the Simulation of Tsunami Propagation
Yoon, Sung-Bum ; Lim, Chae-Ho ; Yoon, Ki-Seung ; Choi, Byung-Ho ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 15, issue 2, 2003, Pages 108~115
Two types of one-dimensional dispersion-correction scheme are developed to take into account the dispersion effects for the simulation of tsunami propagation using ADCIRC finite element model based on shallow-water equations. The first is an implicit scheme, and the dispersion-correction is accomplished by controlling the weighting factor assigned to each spatial derivative term of different time levels. The other scheme is explicit and the dispersion is considered by adjusting the element size. The validity of the dispersioncorrection scheme proposed in this study is confirmed through the comparison of numerical solutions calculated using the new schemes with analytical ones considering dispersion effect of waves.
Wave Field Analysis around Permeable Rubble-Mound Breakwaters
Kwak, Moon-Su ; Lee, Ki-Sang ; Pyun, Chong-Kun ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 15, issue 2, 2003, Pages 116~126
In this study, a method that leads to make a simple decision on important parameters in analysis of wave field in permeable rubble-mound, block-mound breakwater, such as penetration velocity of incident waves and resistance coefficient, is introduced. A model that could analyze wave field of permeable breakwater in harbor, by applying these methods and arbitrary transmission coefficient boundary condition to a time-dependent mild-slope equation, was introduced. The verification of the model was done by carrying out 2-D physical model test on permeable breakwater, measuring the change in water surface elevation, comparing the computation result with time series, and comparing the result gained from the 3-D physical model test on permeable blockmound breakwater in an field harbor with the computation result in terms of regional wave height ratio in a harbor.
Geotechnical Properties of Sandy Tidal Flat and Stability of Artificial Tidal Flat
Kwon, O-Soon ; Jang, In-Sung ; Lee, Kwang-Su ; Yum, Ki-Dai ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 15, issue 2, 2003, Pages 127~137
The researches on the construction of artificial coastal wetlands have been progressed in order to cope with the situation that the area of Korean tidal flat has been reduced due to several coastal developments. This study, as a part of the project on construction of the artificial tidal flats, deals with the comparison of the geotechnical characteristics between natural tidal flat and artificial tidal flat, and is also focused on the stability analysis of tidal flats. Various laboratory tests were performed using disturbed and undisturbed samples, which were obtained from a sandy tidal flat in Korea. The stability of the sandy soils accumulated on the tidal flat was investigated by comparing the shear strength of soil evaluated from laboratory test with induced shear stress due to both current and wave action.
Influences of Ieodo Ocean Research Station on the Ambient Wind Field
Shim, Jae-Seol ; Oh, Byung-Cheol ; Chun, In-Sik ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 15, issue 2, 2003, Pages 138~142
Influences of Ieodo Ocean Research Station(IORS) on the ambient wind field were investigated through a wind tunnel experiment. To secure accurate wind speeds and directions, distortions due to the structure itself on which wind-measuring devices are to be installed should be taken into account. It was shown that the wind speed ratio was sensitive to wind direction and measuring position rather than approaching wind speed. The wind speed ratios measured at main wind tower were more than 1.0 in every approaching direction, and the distortion of wind direction was under