Table of Contents
Table of Contents
Table of Contents ..........................................................................................v
Foreword.......................................................................................................x
CHAPTER 1 ...............................................................................................1-1
Introduction.............................................................................................. 1-1
Contents............................................................................................................................................... 1-1
General Philosophy of the Modeling System ...................................................................................... 1-2
Overview of Hydraulic Capabilities.................................................................................................... 1-2
HEC-RAS Documentation .................................................................................................................. 1-4
Overview of This Manual.................................................................................................................... 1-4
CHAPTER 2 ...............................................................................................2-1
Theoretical Basis for One-Dimensional Flow Calculations .........................2-1
Contents............................................................................................................................................... 2-1
General ................................................................................................................................................ 2-2
Steady Flow Water Surface Profiles.................................................................................................... 2-2
Equations for Basic Profile Calculations......................................................................................... 2-2
Cross Section Subdivision for Conveyance Calculations................................................................ 2-4
Composite Manning's n for the Main Channel................................................................................ 2-6
Evaluation of the Mean Kinetic Energy Head................................................................................. 2-8
Friction Loss Evaluation.................................................................................................................. 2-9
Contraction and Expansion Loss Evaluation................................................................................. 2-10
Computation Procedure................................................................................................................. 2-11
Critical Depth Determination ........................................................................................................ 2-13
Applications of the Momentum Equation ..................................................................................... 2-16
Air Entrainment in High Velocity Streams ................................................................................... 2-19
Steady Flow Program Limitations.................................................................................................2-20
Unsteady Flow Routing..................................................................................................................... 2-22
Continuity Equation ...................................................................................................................... 2-22
Momentum Equation..................................................................................................................... 2-23
Application of the Unsteady Flow Equations Within HEC-RAS.................................................. 2-28
Implicit Finite Difference Scheme ................................................................................................ 2-30
Continuity Equation ...................................................................................................................... 2-32
Momentum Equation..................................................................................................................... 2-33
Added Force Term......................................................................................................................... 2-35
Lateral Influx of Momentum ......................................................................................................... 2-36
Finite Difference Form of the Unsteady Flow Equations.............................................................. 2-37
Linearized, Implicit, Finite Difference Equations ......................................................................... 2-37
Finite Difference Approximation ...................................................................................................... 2-39
Flow Distribution Factor ............................................................................................................... 2-42
Equivalent Flow Path .................................................................................................................... 2-42
Boundary Conditions..................................................................................................................... 2-43
Interior Boundary Conditions (for Reach Connections)................................................................ 2-43
Upstream Boundary Conditions ....................................................................................................2-44
Downstream Boundary Conditions ............................................................................................... 2-45
Skyline Solution of a Sparse System of Linear Equations ............................................................ 2-47
CHAPTER 3 ...............................................................................................3-1
Basic Data Requirements .......................................................................... 3-1
Contents........................................................................................................................................... 3-1
General ................................................................................................................................................ 3-2
Geometric Data ................................................................................................................................... 3-2
Study Limit Determination.............................................................................................................. 3-2
The River System Schematic........................................................................................................... 3-3
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2012-04-05
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收藏 4.18MB PDF 举报 
wqdeng20032014-05-05好像是应用软件说明文档 跟标题没什么关系
