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Numerical Model for Predicting Sand Bar Formation around River Mouth
Masamitsu Kuroiwa,Yuhei Matsubara,Yoko Suzuki,Takayuki Kuchiishi 한국해안,해양공학회 2014 한국해안해양공학회 논문집 Vol.26 No.2
A three-dimensional beach evolution model was presented to predict morphodynamics around a rivermouth. The presented model was based on the depth-averaged (2DH) and quasi three-dimensional (Q-3D) nearshorecurrent modules, and the model took into account shoreline changes, the effect of advection diffusion of suspendedload and discharged sediments from the river. First, the 3D beach evolution model was applied to the formation ofsand spits and terrace at the river mouth in order to investigate the performance of the model. Secondly, the modelwas applied to the river mouth at the Ara River, facing the Sea of Japan. The formation of sand spit at the AraRiver in winter season was reproduced. The computed result showed qualitatively agreement with field siteobservation.
Numerical Model for Predicting Sand Bar Formation around River Mouth
Kuroiwa, Masamitsu(마사미쯔 쿠로이와),Matsubara, Yuhei(유헤이 마쯔바라),Suzuki, Yoko(요코 스즈키),Kuchiishi, Takayuki(타카유키 쿠치이시) 한국해안해양공학회 2014 한국해안해양공학회 논문집 Vol.26 No.2
하구역의 지형변화를 예측하기 위해 3차원 해빈 변형 모델을 통한 계산이 수행되었다. 본 모델은 수심적분을 기초로 한 준 3차원 연안흐름 모듈로 구성되며, 해안선의 변화, 부유사의 이송-확산 효과를 고려할 수 있다. 우선 모델의 성능을 확인하기 위해 3차원 해빈 변화 모델이 하구역 사주 형성에 적용되었다. 다음으로 동해에 인접한 Ara 강 하구에 모델이 적용되었다. Ara 강의 사주의 동계 변화가 재현되었으며 계산결과는 현장 관측 결과와 좋은 일치를 나타냈다. A three-dimensional beach evolution model was presented to predict morphodynamics around a river mouth. The presented model was based on the depth-averaged (2DH) and quasi three-dimensional (Q-3D) nearshore current modules, and the model took into account shoreline changes, the effect of advection diffusion of suspended load and discharged sediments from the river. First, the 3D beach evolution model was applied to the formation of sand spits and terrace at the river mouth in order to investigate the performance of the model. Secondly, the model was applied to the river mouth at the Ara River, facing the Sea of Japan. The formation of sand spit at the Ara River in winter season was reproduced. The computed result showed qualitatively agreement with field site observation.
Development of a three dimensional circulation model based on fractional step method
Mazen Abualtayef,Masamitsu Kuroiwa,Ahmed Khaled Seif,Yuhei Matsubara,Ahmed M. Aly,Alioune Nar Sambe 대한조선학회 2010 International Journal of Naval Architecture and Oc Vol.2 No.1
A numerical model was developed for simulating a three-dimensional multilayer hydrodynamic and thermodynamic model in domains with irregular bottom topography. The model was designed for examining the interactions between flow and topography. The model was based on the three-dimensional Navier-Stokes equations and was solved using the fractional step method, which combines the finite difference method in the horizontal plane and the finite element method in the vertical plane. The numerical techniques were described and the model test and application were presented. For the model application to the northern part of Ariake Sea, the hydrodynamic and thermodynamic results were predicted. The numerically predicted amplitudes and phase angles were well consistent with the field observations.
Development of a three dimensional circulation model based on fractional step method
Abualtayef, Mazen,Kuroiwa, Masamitsu,Sief, Ahmed Khaled,Matsubara, Yuhei,Aly, Ahmed M.,Sayed, Ahmed A.,Sambe, Alioune Nar The Society of Naval Architects of Korea 2010 International Journal of Naval Architecture and Oc Vol.2 No.1
A numerical model was developed for simulating a three-dimensional multilayer hydrodynamic and thermodynamic model in domains with irregular bottom topography. The model was designed for examining the interactions between flow and topography. The model was based on the three-dimensional Navier-Stokes equations and was solved using the fractional step method, which combines the finite difference method in the horizontal plane and the finite element method in the vertical plane. The numerical techniques were described and the model test and application were presented. For the model application to the northern part of Ariake Sea, the hydrodynamic and thermodynamic results were predicted. The numerically predicted amplitudes and phase angles were well consistent with the field observations.
Impacts of sea-level rise on port facilities
Chang-Bae Son,Chang-Je Kim,Won-Yil Jang,Yuhei Matsubara,Hedeaki Noda,Mi-Kum Kim 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2 No.-
From the viewpoint of coastal hydrodynamics, one of the most important effects of global warming is a sea-level rise in coastal areas. In the present study, impacts on port facilities against sea-level rise were investigated. The sea-level rise causes the increase of the water depth, and it generates variations on the wave height, buoyancy, tidal system and nearshore current system and so on. The increase of water depth gives rise to the decrease of crown height of the structure and it causes increase of wave overtopping quantity. It may flood the port zone and its facilities, and may decrease harbor tranquility. It also leads to difficulties on navigation, mooring and loading/unloading at the port. Increase in water depth also causes increase of wave height in surf zone. This high wave makes structures unstable and may cause them to collapse during storm. In addition, increase in buoyant force due to sea-level rise also makes the gravity type structures unstable. Consequently, theses variations due to sea-level rise will cause functional deterioration of port facilities. In order to protect port facilities from the functional deterioration, reinforcement plan is required such as raising the crown height and increase in block weight and so on. Hence proper estimation method for the protection cost is necessary in order to protect port facilities efficiently. Moreover response strategies and integrated coastal zone management plan is required to maintain the function of port facilities. A simple estimation of cost for breakwaters in Korea was performed in the present study.
A hydrodynamic model of nearshore waves and wave-induced currents
Sief, Ahmed Khaled,Kuroiwa, Masamitsu,Abualtayef, Mazen,Mase, Hajime,Matsubara, Yuhei The Society of Naval Architects of Korea 2011 International Journal of Naval Architecture and Oc Vol.3 No.3
In This study develops a quasi-three dimensional numerical model of wave driven coastal currents with accounting the effects of the wave-current interaction and the surface rollers. In the wave model, the current effects on wave breaking and energy dissipation are taken into account as well as the wave diffraction effect. The surface roller associated with wave breaking was modeled based on a modification of the equations by Dally and Brown (1995) and Larson and Kraus (2002). Furthermore, the quasi-three dimensional model, which based on Navier-Stokes equations, was modified in association with the surface roller effect, and solved using frictional step method. The model was validated by data sets obtained during experiments on the Large Scale Sediment Transport Facility (LSTF) basin and the Hazaki Oceanographical Research Station (HORS). Then, a model test against detached breakwater was carried out to investigate the performance of the model around coastal structures. Finally, the model was applied to Akasaki port to verify the hydrodynamics around coastal structures. Good agreements between computations and measurements were obtained with regard to the cross-shore variation in waves and currents in nearshore and surf zone.
A hydrodynamic model of nearshore waves and wave-induced currents
Ahmed Khaled Seif,Masamitsu Kuroiwa,Mazen Abualtayef,Hajime Mase,Yuhei Matsubara 대한조선학회 2011 International Journal of Naval Architecture and Oc Vol.3 No.3
In This study develops a quasi-three dimensional numerical model of wave driven coastal currents with accounting the effects of the wave-current interaction and the surface rollers. In the wave model, the current effects on wave breaking and energy dissipation are taken into account as well as the wave diffraction effect. The surface roller associated with wave breaking was modeled based on a modification of the equations by Dally and Brown (1995) and Larson and Kraus (2002). Furthermore, the quasi-three dimensional model, which based on Navier-Stokes equations, was modified in association with the surface roller effect, and solved using frictional step method. The model was validated by data sets obtained during experiments on the Large Scale Sediment Transport Facility (LSTF) basin and the Hazaki Oceanographical Research Station (HORS). Then,a model test against detached breakwater was carried out to investigate the performance of the model around coastal structures. Finally, the model was applied to Akasaki port to verify the hydrodynamics around coastal structures. Good agreements between computations and measurements were obtained with regard to the cross-shore variation in waves and currents in nearshore and surf zone.