TAILIEUCHUNG - A two dimensional quasi model for simulating flow in open channels

This paper proposes a 2D-quasi model for simulations of the lateral distribution of flow velocity and of unit water discharge in open-channel sections. The latters are obtained by solving the governing equation, which is derived from the Reynolds equations and allows for taking into account the gravity, bed shear stress, and turbulent diffusion force in calculations. Using the experimental data, a sensitivity analysis of modeling parameters, . Manning coefficient and eddy viscosity was performed firstly. | BÀI BÁO KHOA HỌC A TWO-DIMENSIONAL QUASI MODEL FOR SIMULATING FLOW IN OPEN-CHANNELS Chien Pham Van1 Abstract: This paper proposes a 2D-quasi model for simulations of the lateral distribution of flow velocity and of unit water discharge in open-channel sections. The latters are obtained by solving the governing equation, which is derived from the Reynolds equations and allows for taking into account the gravity, bed shear stress, and turbulent diffusion force in calculations. Using the experimental data, a sensitivity analysis of modeling parameters, . Manning coefficient and eddy viscosity was performed firstly. Approximate values of modeling parameters were then calibrated before the model was validated. Next, the proposed 2D-quasi model was applied to represent the flow of three experimental data sets. Four error estimates were computed to quantitatively assess the quality of simulations, revealing that (i) a good agreement between simulations and observations was obtained and (ii) the proposed 2D-quasi model was successfully used to reproduce flow of all experimental data sets using in the study. The capability of proposed 2Dquasi model was also discussed. Keywords: Compound open-channel, 2D-quasi model, flow velocity, eddy viscosity. 1. INTRODUCTION1 Natural and restored waterways are comprised of neither solely simple cross sectional areas nor one of basic geometric shapes like rectangles, trapezoids, or simple curved shapes. They are mostly composed of a main channel and one or more adjacent floodplains. Such channels are known as compound channels whose crosssections are made up of more than one of basic geometric shapes. Generally, water entirely remains in the main channel during low and/or normal flows while water fills the entire main channel and proceeds to spill over into floodplains or overbank areas during high flows. Thus, flow characteristics such as flow velocity and water depth can vary significantly across the section because of the .

• Môi trường
• A two dimensional quasi model
• Simulating flow in open channels
• Compound open channel
• 2D quasi model
• Flow velocity
• Eddy viscosity
• Vietnam Journal of Mechanics
• Quasi two dimensional linking hydraulic model
• The complex river network
• Validation and application
• Dimensional hydraulic model