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박일흠(I.H. Park),김길균(K.K. Kim),이익효(I.H. Lee) 한국해양환경·에너지학회 2005 한국해양환경공학회 학술대회논문집 Vol.2005 No.11
Cohesive sedimentation mechanism has flocculation process which is characterized by cohesion and thus is affected by various physical-chemical factors. In this study, to predict transport of cohesive sediment due to restoration of sea area in coastal region, numerical experiments were carried out and the input parameters in the numerical model were selected by the various hydrodynamic and sedimentary observations. The bottom materials such as silt or clay, in there, were commonly distributed at low speed area of tidal current, but gravel type was existed around high speed area. And also, the spacial SS concentration showed high value tendency in the high speed and deeper area. In the results of numerical experiment, on the other hand, the bottom shear stress was somewhat increased after sea area restoration. Therefore the erosion length of 5 ㎝/year was estimated around restoration area.
TRIVAST모형을 이용한 3차원 해수유동 및 부유사확산 수치모의
선웅배(U. B. Seon),박일흠(I. H. Park),이문옥(M. O. Lee) 한국해양환경·에너지학회 2006 한국해양환경·에너지학회 학술대회논문집 Vol.2006 No.-
하구나 연안에서 부유사 fluxes를 예측하기 위해 3차원 층 적분된 모델을 적용하였다. 모델은 부유사에 대한 질량과 운동량 보존 방정식 그리고 수송방정식을 구하기위해 유한차분 기법을 이용하였다. operator splitting technique과 고도로 정확한 유한 차분기법은 부유사 수송방정식을 구하기위해 사용되었다. 흐름의 형태와 경계조건이 다른것에 대해서 해석해와 비교하였으며, 또한 천수만에서 부유사 fluxes를 예측하기위해 모델을 적용하였다. A three-dimensional layer-integrated model was applied to predict suspended sediment fluxes in estuarine and coastal waters. The model involves a finite diffenence technique to solve the equations of mass and momentum conservation, and the transport equation for suspended sediment. The operator splitting technique and a highly accurate finite difference scheme have been used to solve the suspended sediment transport. The model has been tested on analytical solutions for different flow types and boundary conditions, and has also been applied to predict suspended sediment fluxes in the Chonsu Bay.
황성수(S. S. Hwang),박일흠(I. H. Park),이동수(D. S. Lee),양경욱(K. U. Yang) 유공압건설기계학회 2015 드라이브·컨트롤 Vol.12 No.2
In this study, we suggested the wave power generator using horizontal motions of the wave for use in the coastal sea. The length of the horizontal movement of the wave in the vicinity of the sea surface is larger than the length of the vertical reciprocating movement of the wave, hence the proposed device has a wave power transmission plate. In addition, because the motion of the wave is maximum to the sea surface, by arranging the buoyancy tanks at the top of the wave power transmission plate, it is always capable of vertical movement in accordance with the sea surface. To confirm the usefulness of the proposed wave power generator, we constructed a mathematical model of the wave power generator and carried out simulation using bondgraph. Furthermore, the efficiency was verified by measuring the degree of electrical energy production through a preliminary experiment.
황성수(S. S. Hwang),박일흠(I. H. Park),이동수(D. S. Lee),양경욱(K. U. Yang) 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.6
In this study, we suggested the wave power generator using horizontal motions of the wave for use in the coastal sea. The length of the horizontal movement of the wave in the vicinity of the sea surface is larger than the length of the vertical reciprocating movement of the wave, hence the proposed device has a wave power transmission plate. In addition, because the motion of the wave is maximum to the sea surface, by arranging the buoyancy tanks at the top of the wave power transmission plate, it is always capable of vertical movement in accordance with the sea surface. To confirm the usefulness of the proposed wave power generator, we constructed a mathematical model of the wave power generator and carried out simulation using bondgraph. Furthermore, the efficiency was verified by measuring the degree of electrical energy production through a preliminary experiment.
김종규(J.K. Kim),조성훈(S.H. Cho),박일흠(I.H. Park) 한국해양환경·에너지학회 2004 한국해양환경공학회 학술대회논문집 Vol.2004 No.-
To get the maximum diffusion boundary of thermal effluent from Ha-Dong Thermal Power Plant, paths of TGPS Buoy and surface water temperature were obtained to 4 times at spring tide during 1 year. According to the paths of TGPS Buoy, the flumes of thermal effluent were moved about 25㎞ from outlet to Nand S direction in Gwangyang Bay. After 2-3 times of tidal period the waters were reached to Yosu Bay because the tidal current was predominant in that area. At the summer and winter season, a sudden drop of surface water temperature was detected around 3.5~4㎞ and 1.6~2㎞ radius from the outlet, respectively.