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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 23, Issue 6 - Dec 2011
Volume 23, Issue 5 - Oct 2011
Volume 23, Issue 4 - Aug 2011
Volume 23, Issue 3 - Jun 2011
Volume 23, Issue 2 - Apr 2011
Volume 23, Issue 1 - Feb 2011
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Evaluation of Material Properties of Concrete Harbour Facilities Using Nondestructive Testing Methods
Yi, Jin-Hak ; Han, Sang-Hun ; Park, Woo-Sun ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 1~10
DOI : 10.9765/KSCOE.2011.23.1.001
Recently harbor remodeling projects are seriously considered to enhance the loading and unloading capability of old container terminals and to make decrepit ports as eco-friendly harbor and waterfront spaces in many countries. In such a case, quantitative and qualitative evaluations on concrete harbor facilities are mandatory to determine the current structural integrity condition of aged materials. Once the remodeling project is determined to be carried out, the reusability of individual structural members and facilities including caissons, cell-blocks, and tetra-pods need to be decided based on the simple and economic visual inspection and/or nondestructive testing. In this study, the systematic quantitative evaluation procedure for determining the structural integrity condition and the reusability is studied based the nondestructive testing and evaluation methods. Conventional methods including Schmidt hammer test and ultrasonicpulse velocity methods and elastic wave based methods including impact echo test and surface wave test are applied to the old harbor facilities in five different sites. The compressive tests are also carried out to determine the elastic modulus and compressive strength of concrete materials.
Evaluation of Chloride Ion Penetration Characteristics for Concrete Structures at Coastal Area
Han, Sang-Hun ; Yi, Jin-Hak ; Park, Woo-Sun ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 11~17
DOI : 10.9765/KSCOE.2011.23.1.011
A major source of durability problems in concrete structures is the corrosion of steel by the damage of passivity layer around steel bars. As chloride ion penetration is major cause of the destruction of passivity layer, evaluation of depth and concentration profile of chloride ion is the essential factor for the service-life estimation of concrete structure. To estimate chloride ion penetration characteristics, this paper on the basis of in-situ experimental data investigated the depth and concentration profile of chloride ion penetration. The core specimens are obtained at air-zone, splash zone, and tidal zone in Wando, Masan, Incheon, Gwangyang, and donghae harbors. Colorimentric method measured the chloride ion penetration depth and ASTM C 114 evaluated the concentration profile of chloride ion. Based on experimental data, the influence of harbor location and exposure condition on chloride ion penetration is evaluated.
Damage Monitoring in Foundation-Structure Interface of Harbor Caisson Using Vibration-based Autoregressive Model
Lee, So-Ra ; Lee, So-Young ; Kim, Jeong-Tae ; Park, Woo-Sun ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 18~25
DOI : 10.9765/KSCOE.2011.23.1.018
This study presents the damage monitoring method in foundation-structure interface of harbor caisson using vibration-based autoregressive (AR) model. In order to achieve the objective, the following approaches are implemented. Firstly, vibration-based AR model is selected to monitor the damage in foundation-structure interface of caisson structure. Secondly, finite element analysis on a caisson structure model is implemented to evaluate the vibration-based damage monitoring method. Finally, vibration test on a caisson structure model is performed to evaluate applicability of vibration-based AR model method for foundation-structure interface of caisson structure.
Performance Evaluation of Imote2-Platformed Wireless Smart Sensor Node for Health Monitoring of Harbor Structures
Park, Jae-Hyung ; Kim, Jeong-Tae ; Lee, So-Young ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 26~33
DOI : 10.9765/KSCOE.2011.23.1.026
In this study, a high-sensitive smart wireless sensor based on an Imote2 sensor platform is developed for structural health monitoring of harbor structures. To achieve the objective, the following approaches are implemented. Firstly, the smart wireless sensor based on the high-performance Imote2 sensor platform is designed to measure acceleration with high sensitivity from structures. Secondly, embedded software is designed for autonomous structural health monitoring. Finally, the performance of the smart wireless sensor is estimated from experimental tests on a lab-scaled caisson structure.
Development of a Dynamic Deformable Rubber Membrane Parapet to Cope with the Long Term Sea Level Rise and the Abnormal Waves
Kim, Sun-Sin ; Chun, In-Sik ; Lee, Young-Gun ; Ko, Jang-Hee ; Hong, Seung-Ik ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 34~42
DOI : 10.9765/KSCOE.2011.23.1.034
It's been reported that the global warming effect has invoked the ever increasing typhoon intensity and long-term sea level rise which jointly cause severe wave overtopping over breakwaters or shore dykes. A simple measure to cope with this undesirable change may be just to increase the crest height of the dykes and breakwaters. This is surely effective to prevent wave overtopping, but it also decreases the seaward visibility of coastal waterfront. In this paper, a dynamic deformable rubber membrane parapet which not only reduces wave overtopping in storm period but also secures seascapes in normal days is presented. Several optimal configurations of the parapet are proposed. Through numerical analyses using a nonlinear finite element model and hydraulic experiments, the air controlled expansion and contraction of the parapets, their behavior against wave overtopping and structural stability are investigated.
Numerical Analysis of Flow Pattern by Outflow Gates with Manifold Channel
Kim, Nam-Hyeong ; Lee, Chang-Lym ; Ku, Bon-Soo ; Song, Man-Soon ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 43~49
DOI : 10.9765/KSCOE.2011.23.1.043
For the improvement of water quality in a harbor, several studies have been carried out on SEB (Seawater Exchange Breakwater) in recent years, but a problem has been shown whereby the water on the inside area far from the SEB cannot be easily exchanged. In order to solve the problem of the SEB, the Manifold channel, a new concept of the SEB, is introduced in this paper. By using the manifold channel, it is possible to exchange the water of the inside area for seawater from the outside. Here, to assess the outflow gates of the manifold channel governing flow behavior, a virtual manifold channel controlled the location, width and direction of outflow gates applied to the Jumunjin fishery port, where the SEB has been established. In addition, the desirable flow pattern of the port by utilizing the two layer current model is identified, and five general cases of the manifold channel are described in this paper. The model is verified by comparing with observation of the SEB model, and the results are in general agreement. From the results of the manifold channel, in the case of the Jumunjin fishery port, the small circulation of counter clockwise is necessary for the water exchange on the inside area, but it should be controlled by the outflow gates for other areas. Using the two layer current model, the desirable flow pattern of the port can be predicted, and the water exchange for the upper and lower layer can be examined. For the practical use of the manifold channel, further studies on the manifold channel will be necessary, and it may then be used broadly for the design of breakwater in the future.
Study on Creation Method of Green Space for Port Ecosystem Using the Halophytes
Myeong, Hyeon-Ho ; Lee, Jeom-Sook ; Jeon, Ji-Young ; Song, Man-Soon ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 50~56
DOI : 10.9765/KSCOE.2011.23.1.050
To make conservative port and coast ecosystems and creative the greenspace, We were investigated with characteristic of flora, environmental factors, types of port, adaptive species, minimum conservation area and plantation model. In 50 sites of study areas, there are 19 families and 174 species of vascular plants and 19 families and 48 species of halophytes. Dominant communities in port ecosystem contains Carex kobomugi community, Elymus mollis community, Carex pumila community, Ixeris repens community, Vitex rutundifolia community, Calystegia soldandlla community, Rosa rugosa community, Lathyrus japonica community, Salsola komarovi community, Cynodon dactylon community, Tetragonia tetragonioides community, Suaeda japonica community, Suaeda maritima community, Zoysia sinica community and Phragmites communis community. We carried out Canonical Correspondence Analysis(CCA) for ordinations on the vegetation and plant communities-environmental variable matrices in 50 sites. The communities tended to cluster into three types: Clay marsh, Sand marsh, Sand gravel marsh types. Adaptive species in habitate types are selected that sand marsh-type communities in ports contained Elymus mollis community, Ixeris repens community, Carex kobomugi community, Carex pumila community, Clay marsh-type communities contained Suaeda japonica community, Phragmites communis community, Zoysia sinica community and Suaeda maritima community, Sand gravel marsh-type communities contained Vitex rutundifolia community, Calystegia soldandlla community. We are conducted the estimation of minimal area for plantation of adaptive plant species and carried out guide line and plantation model for creation of green space in port ecosystem.
Analysis on Non-Market Benefit of Port Re-Modeling Factor Using AHP
Yang, Chang-Ho ; Yeo, Gi-Tae ; Jung, Hyun-Jae ; Kim, Ho-Kyun ; Son, Yoo-Lee ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 57~62
DOI : 10.9765/KSCOE.2011.23.1.057
At this point that port industry brings a new change as the concept of 'Green Logistics' appears, studies on an economic analysis of existing port Re-modeling have normally been conducted focused on market value factors such as Benefit-Cost analysis, On the other hand, there have been few studies on the analysis of Non-market value factors such as environmental value. Therefore, the purpose of this study is aimed to establish a Feasibility analysis model of Incheon inner port Re-modeling in the aspect of Non-market Benefit Factors classified by related factors such as, marine environment, waterfront facility and welfare of users by using AHP methodology based on the extracted result through previous studies.
Wave Forces Acting on a Cylindrical Aquaculture Fish Cage
Cho, Il-Hyoung ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 63~69
DOI : 10.9765/KSCOE.2011.23.1.063
In this paper, the wave forces on a cylindrical aquaculture fish cage, which consists of the porous mesh with the uniform porosity, are analyzed using matched eigenfunction expansion method. The boundary condition on the porous net is derived based on the Darcy's law, which implies that the velocity of the fluid passing through the net is linearly proportional to the pressure difference between two sides of the net. The wave forces and wave responses are investigated by changing the porous parameter of porous net as well as the submerged position (floating type, bottom-mounted type) of an aquaculture fish cage. It is found that the wave forces on a bottom-mounted type are largely decreased compared with that on a floating type. Also, the porosity of the netting structure plays an important role in reducing the wave forces and the wave elevation in the vicinity of an aquaculture fish cage.
Generation Mechanism and Numerical Simulation of Rip Current at Haeundae Beach
Kim, In-Chul ; Lee, Joo-Yong ; Lee, Jung-Lyul ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 70~78
DOI : 10.9765/KSCOE.2011.23.1.070
At Haeundae Beach in Busan, people were swept away by the fast-moving rip current and rescued, on August 13th and 15th, 2009 & July 29th and 30th, 2010. In predicting the wave-induced current and consequent tube movement for public safety, the coastal flows and waves are calculated at each time step and grid point by means of systematic interfacing of hydrodynamic and wave models (Lee, 2001). To provide a user-friendly simulation tool for end-users, the forecasting system has been built in a software package called HAECUM. Outputs from the system are viewed as graphs of tube positions with combined current vectors for easy decision of emergency management officials. The tube-wave interaction is taken into account and the traces of swim tube are simulated by using a Lagrangian random walk (Chorin, 1978; Lee, 1994). In this study, we use the Lee's approach (Lee, 1993) in estimating the surface onshore currents due to wave breaking.
The Study on the Wave Pressure of the Tsunami Acting on the Permeable Structure
Lee, Kwang-Ho ; Choi, Hyun-Seok ; Kim, Chang-Hoon ; Kim, Do-Sam ; Cho, Sung ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 79~92
DOI : 10.9765/KSCOE.2011.23.1.079
In this study, wave pressure of short-period gravity waves and tsunami acting on the upright section of the horizontal-slit type caisson placed on the impermeable or permeable seabed, which is a well-known permeable breakwater with a good wave controlling ability, are investigated via numerical simulations. Further, the permeable seabed was modeled as the porous media with porosity of 0.4. Using the numerical results, the effects of the seabed conditions on the wave pressure on the front wall and inside wall of the chamber have been studied. In the numerical simulations, short-period gravity waves and tsunami(solitary wave or bore) with the same amplitude to the gravity wave are considered. A numerical wave tank is used, which is able to consider a gas-liquid two-phase flow in the same calculation zone. Numerical results show that the wave pressure of the tsunami was 3~5 times higher than the short-period gravity waves acting on the front wall and it was 2~4 times higher than the short-period gravity waves acting on the inner wall.
Simulation of Inundation at Mokpo City Using a Coupled Tide-Surge Model
Park, Seon-Jung ; Kang, Ju-Whan ; Moon, Seung-Rok ; Kim, Yang-Seon ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 93~100
DOI : 10.9765/KSCOE.2011.23.1.093
A coupled tide-surge model, which has been evaluated the utility in the previous study, is applied for simulating the inundation phenomena. The coupled model system adopts the hydrodynamic module of MIKE21 software, and the study area is identical to the previous study. The only difference is additional detailed areas for simulating inundation. An artificial scenario of a virtual typhoon striking Mokpo coastal zone at spring high tide is simulated. Then the calculated water level corresponds to the extreme high water level(556 cm) for 100 year return period. The result also shows the inundation depth is 50~100 cm not only near the Mokpo Inner Port but also near the Mokpo North Port. Finally, the coastal inundation prediction map is drawn on the basis of inundation simulation results.
The Study of Salinity Distribution at Nakdong River Estuary
Han, Chong-Soo ; Park, Sang-Kil ; Jung, Sang-Woo ; Roh, Tae-Young ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 101~108
DOI : 10.9765/KSCOE.2011.23.1.101
The purpose of salinity intrusion due to numerical simulation is analaysis for saline intrusion to the upstream channel in Nakdong River Estuary Barrage(NREB) to get enough fresh water. Conditions that occur salinity intrusion affect by tidal distribution at seas, so salinity concentration changes according to tidal phenomenon. Making this connection cleary can help preventing salinity intrusion. In this study, estimating salinity intrusion to the upstream channel in NREB using EOMSED model, we reexamine NREB's existence. Comparison is also made with observing data. In result, when inflow discharges at
is more similar with respect to observing data than
at ECOMSED model. Thus, estimations are more precise at little discharges than lots of discharges.
Prediction of Stability Number for Tetrapod Armour Block Using Artificial Neural Network and M5' Model Tree
Kim, Seung-Woo ; Suh, Kyung-Duck ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 109~117
DOI : 10.9765/KSCOE.2011.23.1.109
It was calculated using empirical formulas for the weight of Tetrapod, which was a representative armor unit in the rubble mound breakwater in Korea. As the formulas were evaluated from a curve-fitting with the result of hydraulic test, the uncertainty of experimental error was included. Therefore, the neural network and M5' model tree were used to minimize the uncertainty and predicted the stability number of armor block. The index of agreement between the predicted and measured stability number was calculated to assess the degree of uncertainty for each model. While the neural network with the highest index of agreement have an excellent prediction capability, a significant disadvantage exists that general designers can not easily handle the method. However, although M5' model tree has a lower prediction capability than the neural network, the model tree is easily used by the designers because it has a good prediction capability compared with the existing empirical formula and can be used to propose the formulas like an empirical formula.
Experimental Study on Hydraulic Resistance of Sea Ground Considering Tidal Current Flow
Kim, Young-Sang ; Gang, Gyeong-O ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 118~125
DOI : 10.9765/KSCOE.2011.23.1.118
Conventional erosion function apparatus (EFA) which has been used to measure the hydraulic resistance of soil was improved to consider direction change of the current flow. Using improved apparatus, hydraulic resistance capacities of the artificially composed clayey soil and sandy soil were compared. Test result shows that scour rates which were measured under the bi-directional flow were much higher than those measured under unidirectional flow for both type soils. Scour rate of sandy soil was higher than that of clayey soil. Velocity averaged scour rate of specimen which was consolidated under the relatively large consolidation pressure is higher than that of specimen which is consolidated under small consolidation pressure, which means scour problem under bidirectional flow may be more serious for the deep seabed ground.
Variation of Density Stratification due to Fresh Water Discharge in the Kwangyang Bay and Jinju Bay
Kang, Young-Seung ; Chae, Yeong-Ki ; Lee, Hyung-Rae ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 23, issue 1, 2011, Pages 126~137
DOI : 10.9765/KSCOE.2011.23.1.126
This study simulate three-dimensional ocean circulation patterns using the EFDC model in the Kwangyang Bay and Jinju Bay, considering tide, water temperature and salinity. The numerical model results were verified using observed data. The model results well reproduced the observed data. As a result, ocean circulation patterns in the study area show convergence and divergence in the middle area of Noryang waterway and Daebang waterway, the residual flow patterns show typical two-layer circulation. According to the change of the density stratification in the Kwangyang Bay and Jinju Bay, the effect of fresh water is dominant in study area. In the case of Jinju Bay, although it is strongly influenced by the Namgang fresh water, also it is affected by Seomjin River when there is no discharge by Namgang Dam. On the other hand, the stratification of the Kwangyang Bay is relatively enhanced by the discharge of Namgang Dam.