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A Quasi-2D Model of Unsteady Flows for River Ice Processes

Author(s): Yang Kai-Lin; Guo Xin-Lei; Wang Tao; Fu Hui; Guo Yong-Xin

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Keywords: Quasi-2D; Lateral velocity; Non-uniform flow; River ice; Composite friction factor

Abstract: The development of the quasi-2D unsteady flow models for river ice processes is one of the trends in the ice simulation field. The key idea of the algorithm is that the water level and flow along the flow direction are determined by the 1D unsteady flow model known as the St. Venant Equations and then the lateral velocity distribution within a cross section is calculated by the quasi-2D steady flow model. Based on the Ravier-Stokes model, the universal quasi-2D model for predicting the lateral velocity distribution within a cross section for prismatic channel under free flow and ice-covered flow conditions was presented. The formula of the local composite friction factor was given. The coupling method for 1D model and quasi-2D model was described in short. At last, the computational examples for application were given.

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Year: 2014

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