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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 16, Issue 4 - 00 2004
Volume 16, Issue 3 - 00 2004
Volume 16, Issue 2 - 00 2004
Volume 16, Issue 1 - 00 2004
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Dispersion-Correction of I-D Finite Element Model for Tsunami Propagation Using Explicit Scheme
Yoon, Sung-Bum ; Lim, Chae-Ho ; Yoon, Ki-Seung ; Choi, Byung-Ho ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 16, issue 2, 2004, Pages 57~63
Wave lengths of tsunamis are shorter than those of tides, and the dispersion effect of tsunamis is relatively strong. Thus, it should be properly considered in the numerical simulation of distant tsunami propagation for better accuracy. In the present study an active dispersion-correction scheme using explicit scheme is developed to take into account the dispersion effect in the simulation of tsunami propagation using one-dimensional finite element method based on wave equation. The validity of the dispersion-correction scheme proposed in this study is confirmed through the comparision of numerical solutions calculated using the present scheme with analytical ones considering dispersion effect of waves.
Prediction of Settlement of SCP Composite Ground using Genetic Algorithm
Park, Hyun-Il ; Kim, Yun-Tae ; Lee, Hyung-Joo ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 16, issue 2, 2004, Pages 64~74
In order to accelerate the rate of consolidation settlement, to reduce settlement, and to increase bearing capacity for soft ground under quay wall, sand compaction pile method (SCP) has widely been applied. Improved ground is composite ground which is consisted of the sand pile-surrounding clayey soil. As caisson and upper structures are installed on SCP composite ground, the settlement is compositively occurred by elastic compression of sand compaction piles and also consolidation of the surrounding clay ground. In this study, the combined settlement model is proposed to predict the settlement of SCP composite ground in basis of elastic theory for sand compaction pile and consolidation theory for marine soft clay. Optimization technique was performed based on back-analysis so that real coded genetic algorithm was applied to estimate the parameters of the proposed settlement model. Case analysis was carried out for a domestic SCP composite ground to examine the applicability of the proposed prediction technique.
An Qualitative Analysis on the Beach Deformation of the Sangju Beach with Field Observation
Ham, Gye-Un ; Jang, Dae-Jeong ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 16, issue 2, 2004, Pages 75~82
The changes of sea bottom configuration, which may cause the coastal disasters, have been considered as social problems. It is obvious that the beach deformation is attributable to the sediment transport associated with erosion and acceration. The prediction method and countermeasures for them, however, are not on the level of satisfaction, which indicates that efforts should be made on developing them. In this study, it is found that the groin constructed in Sangju beach on the purpose of beach protection did the aversive function. The reason for this was judged that they accelerated the speed of erosion by increasing the velocity wave-induced current rather than brought storage effect of sediment. Authors found that the storage sediment estimation model by Sonu and Beek(1971) is a useful model at the Sangju beach with the use of topographical survey data from July, 1987 to March, 2003.
Wave Control by a Surface-Mounted Horizontal Membrane
Cho, Il-Hyeong ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 16, issue 2, 2004, Pages 83~91
The performance of wave control by a surface-mounted horizontal membrane is analyzed in the frame of linear potential theory. To employ the eigenfunction expansion method, the fluid domain is divided into two regions i.e, region without membrane and membrane-covered region. By matching the each solutions at boundaries of adjacent regions, the complete solution is obtained. The present analytical method solving the scattering problem directly gives the same results as Cho and Kim(1998)"s method solving the diffraction and the radiation problem separately. To verify the developed model, the model test with a surface-mounted horizontal membrane is conducted at the wave tank(36m×0.91m×1.22m). The analytic results are in good agreement with the experimental results. The reflection and transmission coefficients are investigated according to the change of membrane tension, length and incident frequencies.
An Analytical Model for Predicting Heat Transport due to a Point Source in Coastal Water under a Spring-Neap Modulation of Tidal Currents
Lee, Ho-Jin ; Kim, Chong-Hak ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 16, issue 2, 2004, Pages 92~102
본 논문은 조류의 대 소조 변동이 존재하는 해역에서의 점열원에 대한 초과수온 분포를 예측하는 해석해를 다룬다. 해석해는 Jung et al.(2003)이 제시한 2차원 해석해를 기본으로 하여 조류의 대 소조 변동과 수평 확산계수의 대 소조 변화를 반영할 수 있는 형태로 확장되었다. 일련의 해석모형 실험을 통해 조류 및 난류 확산의 변동에 따른 열오염의 이동 확산 변화를 검토하였다. 실험결과 열오염의 이동 확산은 tidal excursion 거리 이내에서는 조류의 크기에 좌우되며 tidal excursion 거리를 벗어난 해역에서는 주로 수평 확산에 의해 결정되는 것으로 나타났다. 특히 tidal excursion 거리 이내 해역에서 초과수온 분포는 수평 확산계수의 대 소조 변동에 큰 영향을 받는 것으로 나타났다. 즉,
이상의 비교적 높은 초과수온이 발생하는 범위는 수평 확산계수의 대 소조 변동을 고려하는 경우가 상대적으로 더 멀리 확장하는 경향을 보여주었다. In this paper, an analytical solution of calculating the excess temperature field due to a point heat source is presented in the presence of spring-neap modulation of convective alongshore flow. The basic form of the solution is identical to that given by lung et al. (2003) but the convective term in the exponential kernel function is extended and a spring-neap variation in the horizontal eddy diffusivity is newly introduced. A set of calculations have been performed to examine the sensitivity of the heat build-up to the change in current fields and turbulent dispersion. Results indicate that the excess temperature field is confined within the tidal excursion distance, while the excess temperature field beyond the distance is mainly controlled by the horizontal diffusion. The heat build-up within the distance is considerably affected by the spring-neap variation in the horizontal eddy diffusivity; the relatively high excess temperature more than
is extended further when the eddy diffusivity has spring-neap modulation.
Breakwater Design against Flood and Typhoon
Kim, In-Ho ; Yoo, Dong-Hoon ;
Journal of Korean Society of Coastal and Ocean Engineers, volume 16, issue 2, 2004, Pages 103~107
Empirical equation has been developed by employing the new non-dimensional physical number "wave action slope" for the estimation of breakwater armor weight. Van der Meer(1987) introduced Iribarren number for the same purpose, but his equation shows very different trend of distribution with the condition of Iribarren number. On the other hand the equation related with wave action slope keeps the same trend of distribution over the whole region. When the parameter is related to the Iribarren number, the equation of wave action slope has a very high accuracy.