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Two-Dimensional Flow and Sediment Numerical Model for River of Mountain Area

Author: JieGang
Tutor: LiuXingNian
School: Sichuan University
Course: Hydraulics and River Dynamics
Keywords: Mountain river Bedload Plane two-dimensional Mathematical model
CLC: TV149
Type: Master's thesis
Year: 2004
Downloads: 485
Quote: 7
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Abstract


Numerical simulation as an important means of the rivers analog field, has played an increasingly large role in the practical application. The traditional one-dimensional model can be given a long reach long-term deformation, and has been used successfully in the long-term siltation of the reservoir calculation, the river is long-term deformation calculation. Changes of erosion but for complex river, bend, pools and shallows evolution of hydraulic structures near local erosion and deposition, one-dimensional model of helpless dimensional or the solution of these problems depends on the numerical simulation dimensional sediment mathematical models. Three-dimensional model complex, slower, prominent advantage of the two-dimensional model. The traditional two-dimensional model used in estuaries, bays, lakes, and downstream reach broad and shallow waters, while not much can be used to model mountain rivers. According to the characteristics of the mountain rivers to improve on the traditional two-dimensional model, the establishment of a mathematical model of the mountain rivers dimensional bedload. Complex mountainous river boundary is extremely irregular, with a body-fitted coordinate mesh solution domain, near the border to keep the orthogonality of the grid, and the grid density can be controlled to maintain the smoothness of the grid. Discrete finite difference ADI method, flow control equations fitted coordinates pursuit method for solving equations after discretization. Stability of the method, the computing speed, while occupying less memory. On the boundary processing to \Model such as topography, bathymetry smooth, the generalizability to avoid deep pools, shoals acute deformation to simulate large error. Bed movable layer stratified sediment model to calculate, you can easily calculate the layers of sediment gradation. Non-uniform sediment shear stress formula based on non-uniform sediment characteristics, the introduction of a two-dimensional model calculations, the model can be used for the calculation of the non-uniform sediment. On the the Minjiang river segment Dujiangyan outside the simulation of the flow field and bedload scour. And experimental data lt; WP = gt; Sichuan University, a master's degree thesis mountainous rivers D sediment mathematical model are compared, and the results show that the model can be used for the calculation of mountain rivers. Also try and CFD commercial software Fluent Euler solid-liquid two-phase flow model of the Wanyuan State River, Tuojiang Jintang reach the simulation of bedload. Comparative analysis and experimental results show that the two-phase model for bedload calculations, but also built body, boundary treatment issue needs further study.

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CLC: > Industrial Technology > Hydraulic Engineering > The basic science of water resources project > Sediment dynamics, River Dynamics > Sediment tests and test research
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