文摘
英文文摘
前言
学位论文使创性声明及学位论文使用说明
Chapter 1 Introduction
1.1 General Overview
1.2 Literatures Review
1.2.1 One-Dimensional Models
1.2.2 Two-Dimensional Models
1.3 Thesis Objective
Chapter 2 One-Dimensional Numerical Model for Degradation and Armoring Process in Alluvial Channels
2.1 Introduction
2.2 Types and Causes of Degradation
2.3 Governing Equations
2.4 Armor Layer Development
2.5 Probability of the Particle to Stay on the Bed
2.6 Computation of the Median Sediment Diameter
2.7 Numerical Scheme
2.8 Procedure for the Calculation of Degradation
2.8.1 Initial and Boundary Condition
2.8.2 Application and Comparison with Experimental Results
2.9 Conclusion
Chapter 3 Application of Stream Tube Model GSTARS2.1 to Simulate Degradation Process in Tigris River
3.1 Introduction
3.2 Review of the GSTARS2.1 Model
3.2.1 Governing Equations for Hydrodynamics
3.2.2 Model Representation
3.3.3 Flow Resistance
3.3.4 Stream Line and Stream tubes
3.3.5 Sediment Routing
3.3 Discretization of the Governing Equations of the Model
3.4 Sediment Transport Capacity Computation
3.5 Bed Sorting and Armoring
3.6 Computation of Width Changes
3.7 Channel Side Slope Adjustments
3.8 Application of the GSTARS 2.1 model for degradation in alluvial channels
3.8.1 Verification of the Model
3.8.2. Application of the Model on a Reach From Tigris River
3.9 Comparison between 1D Model and GSTARS2.1 Model
3.10 Conclusion
Chapter 4 2D Numerical Model for Channel Flow and Morphological Changes
4.1 Introduction
4.2 Governing Equations for hydrodynamics
4.2.1 Governing Equations
4.2.2 Eddy Viscosity Models
4.2.3 Two-dimensional k-ε model for depth-integrated flow
4.2.4. Shear Stress on the Bed
4.3 Finite Element Approach
4.3.1 Introduction
4.3.2 Interpolation Functions
4.3.3 Finite Element Operators for Calculating Derivatives
4.3.4 Four Node Bilinear Element
4.3.5 Staggered Mesh for Solving the Continuity Equation
4.3.6 Solution Method
4.4 Upwinding Scheme
4.5 Boundary and Initial Conditions
4.5.1 Inlet Boundary
4.5.2 Outlet Boundary
4.5.3 Solid Wall boundary
4.5.4. Boundary Condition for k-ε Model
4.6 Sediment Transport and Bed Change Simulation
4.6.1 Bed Load Formula
4.6.2 Correction to the critical shear stress
4.6.3 Bed Load Motion Affected by Transversal Slope
4.6.4 Bed Load Motion Affected by Secondary Flow
4.6.5 Bed Form Change Due to Gravity
4.6.6 Bed Morphological Change Due to Bed Load Transport
4.6.7 Suspended Sediment Transport Model
4.6.8 Bank Erosion and Channel Migration Model
4.7 Flow Chart of the Main Structure of the Model
4.8 Part A: Effect of Channel Curvature and Transverse Bed Slope on Flow Characteristics and Bed Topography
4.8.1 Introduction
4.8.2 Model Verification and Application
4.8.3 Data Analysis
4.8.3 Data Analysis 4.8.3.1 Water Surface Analysis
4.8.3 Data Analysis 4.8.3.2 Variation in velocity distribution
4.8.3 Data Analysis 4.8.3.3 Bed Level Changes
4.8.4 Conclusion
4.9 Part B:Application of Depth-Integrated 2-D model CCHE2D to Simulate the Flow Field in Ganjiang River
4.9.1 Introduction
4.9.2 Description of Study Reach
4.9.3 Input Data and Boundary Conditions
4.9.4 Verification of the model
4.9.5 Application of the Model
4.9.6 Conclusion
Chapter 5 Summary and Conclusions
5.1 Summary
5.2 Conclusions
5.3 Future Research
References
ACKNOWLEDGEMENT
List of Publications
