• 한국해양공학회지
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• 제17권2호
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• pp.1-7
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• 2003

A common feature in the three-dimensional numerical model experiments of coastal discharge with simplifed model and idealized external forcings is investigated. The velocity fields due to the buoyancy and flow flux, are spreaded radiately and the surface velocites are much greater than homegeneous discharges. The coastal dischargd due to the Coriolis force and flow flux are shaped a anticyclical gyre (clockwise) and determined the scale of the gyre in the coastal zone, respectively. The bottom topography restricts a outward extention of the coastal fronts and it accelerates a southward flow.

• 한국해양공학회지
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• 제20권5호
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• pp.23-29
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• 2006

A quasi depth-varying mathematical model for wind-generated circulation in coastal areas, expressed in terms of the depth-averaged horizontal velocity components and free surface elevation was validated and used to understand the diurnal circulation process. The wind velocity is considered as a dominant factor for driving the current. In this paper, three-dimensional numerical experiments that included the land topography were used to investigate the mesoscale air flaw over the coastal regions. The surface temperature of the inland area was determined through a surface heat budget consideration with the inclusion of a layer of vegetation.A series of numerical experiments were then carried out to investigate the diurnal response of the air flaw and wind-generated circulation to various types of surface inhomogeneities.

• 한국해안해양공학회:학술대회논문집
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• 한국해안해양공학회 2004년도 학술발표논문집 Proceedings of Coastal and Ocean Engineering in Korea
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• pp.361-363
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• 2004

• 한국해안해양공학회:학술대회논문집
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• 한국해안해양공학회 2008년도 발표논문집
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• pp.164-167
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• 2008

• 한국해안해양공학회:학술대회논문집
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• 한국해안해양공학회 2008년도 발표 논문집 제17권
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• pp.164-167
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• 2008

• 한국해안해양공학회지
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• 제7권1호
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• pp.91-107
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• 1995

본 논문에서는 이안류의 생성ㆍ유지에 대한 모형을 크게 세가지로, 2차원 평면지형에서도 이안류가 생성되어 유지될 수 있는 프리즘지형 모형 (prismatic topography models), 이안류의 생성ㆍ유지를 위하여 쇄파대내의 3차원 해저지형을 필요로 하는 비프리즘지형 모형(non-prismatic topography models), 그리고 해안선을 따른 돌제 또는 방파제 등의 해안구조물이 생성하는 이안류 모형 등으로 분류하였다. 그러나 이안류의 생성ㆍ유지에 관계되는 모든 변수들을 포함한 지배역학현상을 규명하기 위해서는 더욱 더 많은 문헌연구가 필요하다는 것을 알았다. 다음에 연안사주 또는 잠제 등이 존재하는 해안지형과 그 위로의 해수 전달을 고려하여 연안사주와 해안선 사이에 흐르는 해안방향으로의 흐름현상을 예측키 위한 이론적인 모형을 개발하였다. 이 수리모형은 휴체력과 해저지형변환간에 서서히 발생하는 상호 간섭(slow feedback)을 고려할 수 있는 퇴적물 이동모형과 함께 연안지역에서의 해저지형변환 예측에 이용될 수 있으리라 사려된다.

• Korean Journal of Geomatics
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• 제2권1호
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• pp.57-64
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• 2002

Measuring the depth of water is very important in ensuring the protection and safety of seaside. There are many difficulties in making the contour bathymetric map, and contour line due to the limitation of continuous measurement of water depth and collimation with the conventional measuring and positioning methods. But the real-time kinematic GPS (RTK GPS) positioning using a carrier phase enables us to decide a precise position without breaking a signal even under the condition of a moving environment. It is also possible to obtain an accurate depth of water in real time with a fathometer through the measuring of time delay between sending and receiving epochs. This research aims at investigation of accuracy potential of RTK GPS in combination with Echo Sounder(E/S) for the coastal mapping. Apart from this purpose, the accuracy of ambiguity resolution with the OTF(On the Fly) method was tested with respect to the initialization time. The result shows that the accuracy is better than 1cm with 5-minute initialization in the distance of 10km baseline. The seaside topography was measured by the RTK GPS only, on the other hand the seafloor topography was surveyed in combination of RTK GPS and E/S. Comparing to the volume of seaside measured by RTK GPS and digital topographical map, the difference of only 2 % was achieved. This indicates that the coastal mapping with RTK GPS is successfully conducted. In addition it is also demonstrated that the 3-dimensional perspective model resulted from the undersea topography measured by RTK GPS and E/S is very close to that from the digital map. Through this study, it was verified that RTK GPS is to be very useful method in the analysis of coastal morphology owing to its capability of getting the precise DTM for the using of harbor reclamation, dredging, and the estimation of soil movement in a river.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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• pp.692-694
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• 2006

X-SAR images taken on the coastal waters of Hwanghe province in Korea during SIR-C/X-SAR campaign in April and October 1994 are analysed. The SAR images show the peculiar signatures like nail marks, curved long string, and vortex streets patterns and they all seem to be produced by strong interactions between the topography in the coastal waters and tidal currents. The nail mark signatures are located at the same position of small scaled sand banks and the curved line patterns are almost identical to the outer boundary of large sand banks. Based on the tidal record, all the three images are taken at the almost same phase of tidal cycles, which are close to the low tide. It seems that bottom shapes are more strongly appeared on the SAR images when the tidal currents are slow. The front between two different current velocities caused by the flows along the steep boundaries of sandbanks is also the main factors imprinting the bottom features to the sea surface SAR images

• 대한원격탐사학회지
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• 제22권5호
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• pp.415-419
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• 2006

X-SAR images taken on the coastal waters of Hwanghe province in Korea during SIR-C/X-SAR campaign in April and October 1994 are analysed. The SAR images show the peculiar signatures like nail marks, curved long string, and vortex street patterns and they all seem to be produced by strong interactions between the topography in the coastal waters and tidal currents. The nail mark signatures are located at the same position of small scaled sand banks and the curved line patterns are almost identical to the outer boundary of large sand banks. Based on the tidal records, all the three images are taken at the almost same phase of tidal cycles, which are close to the low tide. It seems that bottom shapes are more strongly appeared on the SAR images when the tidal currents are slow. The front between two different current velocities caused by the flows along the steep boundaries of sandbanks is also the main factors imprinting the bottom features to the sea surface SAR images.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2006년도 학술발표회 논문집
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• pp.1925-1930
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• 2006

흐름의 연직분포를 가정하여 수면에서 바닥까지 적분하여 평균화한 방정식에 기초한 준2차원 흐름모형을 연안해역에서의 취송류해석을 위해 적용되었다. 바람장의 변동에 따른 취송류장의 변동이 크게 나타나므로 본 연구에서는 육상지형의 영향을 고려할 수 있는 3차원 중규모 지역기상장 모형을 통해 연안해역에서의 시간에 따른 바람장변동을 수치해석 하였다. 육상에서의 지표면 열수지 변화를 위해 식생모델을 적용하였다. 기상장과 취송류 해석을 위한 수치모형실험결과 바람장의 변동에 따른 연안역에서의 흐름특성을 효과적으로 예측하고 있음을 확인하였다.