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윤종성 인제대학교 1996 仁濟論叢 Vol.12 No.1
The purpose of this study is to develop a numerical model of two-dimensional unsteady flow that composed as St. Venant equation incorporated with general curve-linear coordinates by MacCormack's scheme. First, this study comprehends the flow mechanism through the results of hydraulic experiments. Second, it verifies the fatness and feasibility of the present numerical model. The numerical model developed by this study regenerate a coexisting sub- and super- critical two dimensional flow. On this study, the numerical model is useful to express suddenly changed flow by hydraulic structures. Through this model it would be obtained good results of flow velocity and water level through the application to numerical simulation.
연안역에서의 저층 빈산소수의 용승현상 (청조현상) 에 관한 연구
윤종성 한국환경과학회 1998 한국환경과학회지 Vol.7 No.3
Recently, upwelling of anoxic bottom water mass have been frequently observed in northeast part of Tokyo Bay in Japan during summer to autumn. Since the colour of water surface becomes milky-blue or milky-green, the upwelling phenomenon is called 'Blue Tide'. The data analysis of field surveys during 'Blue Tide' appearance have been performed for understanding the physical features of the 'Blue Tide' phenomena in Tokyo Bay. It becomes clear that (1) the formation of the anoxic bottom water correlates well with the temperature difference between the surface and bottom waters, (2) there are two necessary conditions for generating 'Blue Tide' ; that is, strong stratification and off-shore wind. The strong southwest(on-shore) wind before the 'Blue Tide' appearance may play an important role to make the stratification strengthen. When these conditions are larger and the northeast or east-northeast (off-shore) wind stronger than 5 m/s blows in succession, the 'Blue Tide' upwelling appears at the head of Tokyo Bay.