HEC-RAS 2D User's Manual
HEC-RAS 2D User's Manual
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HEC-RAS 2D User's Manual
Welcome to HEC-RAS.
Get Started
Topics
Foreword
Introduction
HEC-RAS 2D Modeling Advantages/Capabilities
Developing a 2D or 1D/2D Unsteady Flow Model
Current Limitations of the 2D modeling Capabilities
Developing a Terrain Model and Geospatial Layers
Opening RAS Mapper
Setting the Spatial Reference Projection
Loading Terrain Data and Making the Terrain Model
Using Cross Section Data to Modify/Improve the Terrain Model
Creating Land Cover, Manning’s n values, and % Impervious Layers
Creating a Soils Data Layer
Creating an Infiltration Layer
Infiltration Methods
Development of a 2D or Combined 1D/2D Model
Development of the 2D Computational Mesh
Creating Hydraulic Property Tables for 2D Flow Areas
Connecting 2D Flow Areas to 1D Hydraulic Elements
Hydraulic Structures Inside of 2D Flow Areas
Geospatial Coordinates for Hydraulic Outlets Connected to 2D Flow Areas
Modeling Bridges Inside 2D Flow Areas
Modeling Pump Stations inside 2D Flow Areas
Boundary and Initial Conditions for 2D Flow Areas
External Boundary Conditions
Internal Boundary Conditions
Global Boundary Conditions
Initial Conditions
Running a Model with 2D Flow Areas
Shallow Water or Diffusion Wave Equations
Selecting an Appropriate Grid Size and Time Step
Variable Time Step Capabilities
Performing the Computations
Computation Progress, Numerical Stability, and Volume Accounting
2D Computation Options and Tolerances
New 1D Computational Options
Wind Force Options
Viewing 2D or 1D/2D Output using HEC-RAS Mapper
Overview of RAS Mapper Output Capabilities
Adding Results Map Layers for Visualization
Map Rendering Modes
Dynamic Mapping
Creating Static (Stored) Maps
Plotting Velocity
Querying RAS Mapper Results
Time Series Output Plots and Tables
Profile Lines
User Defined Views
Background Map Layers
National Levee Database
2D Output File (HDF5 binary file)
3D Perspective Plots
Steady vs. Unsteady Flow and 1D vs. 2D Modeling
Steady vs. Unsteady Flow Modeling
1D vs. 2D Hydraulic Modeling
Optimize Your Computer for Fast Computations
References
RAS Mapper Supported File Formats
Terms and Conditions of Use