HEC-RAS 2D Modeling
Recorded on May 9, 2017 (120 minutes)

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With the release of HEC-RAS 5.0 (and newer versions), the Hydrologic Engineering Center (HEC) has added the ability to perform two-dimensional (2D) hydrodynamic routing to the HEC-RAS computer model.  This webinar will provide an overview of the new HEC-RAS 2D tools and solution processes and the basic capabilities of the HEC-RAS 2D model.  The 2D flow modeling can be accomplished by adding 2D flow area element.  This is similar to adding a storage area in a 1D unsteady flow model.  The flow area is developed by adding a 2D polygon, developing the computational mesh, and linking the 2D flow area either to a 1D model element or directly connecting boundary conditions to the 2D flow area.  Each of these steps will be discussed.  Guidelines on when to use 2D flow modeling and an example problem of developing a simple computational mesh and running the model will also be covered. 

Participants will gain an understanding of:

  1. HEC-RAS 2D flow modeling advantages/capabilities
  2. Flexible computational mesh
  3. Cell and face pre-processing
  4. Boundary conditions
  5. Running the model

Arthur C. Miller, Ph.D., DWRE is a nationally recognized expert in hydrology, hydraulic engineering, dam safety, and water resource management. His over 40 years of experience includes research, consulting, and publishing in hydrology, hydraulics, floodplain delineation, dam safety, bridge scour, river mechanics, sediment transport, and impacts of climate change.  He is renowned for his expertise in numerical modeling of open channel flow; unsteady flow; hydraulic design techniques for dams, bridges and culverts; river mechanics; and sediment transport.  Dr. Miller teaches courses throughout the country on topics ranging from fundamental hydraulics to open channel flow to hydrologic processes. He regularly teaches courses for the National Highway Institute, Association of State Dam Safety Officials, Federal Energy Regulatory Commission, and Federal Emergency Management Agency. 

Amanda J. Hess, P.E., CFM is a Hydrology and Hydraulics Group Manager and Senior Project Engineer in the Dams and Hydraulics Section of Gannett Fleming, Inc.  Amanda received her bachelorís and masterís degrees in civil engineering from the Pennsylvania State University.  She has over 16 years of experience working on dams, flood control projects, and water supply systems and performing a wide range of hydraulic and hydrologic analyses.  She is responsible for leading a team of engineers to perform hydrologic and 1-, 2- and 3-D hydraulic analyses for water resources projects and design hydraulic structures related to flood control reservoirs, dams, bridges, and channel improvement construction, rehabilitation, and reconstruction projects, including the design of spillways, outlet works, and stilling basins.  Amanda regularly instructs courses on hydrologic and hydraulic modeling.

  1. Introduction of 2D Modeling and HEC-RAS 2D
    1. When You Need 2D Modeling
    2. 2D Solutions
    3. HEC-RAS Solution Schemes
  2. 2D Model Set-up
    1. Terrain Data
    2. Computational Mesh
    3. Other Inputs
    4. Boundary and Initial Conditions
  3. Results, Troubleshooting and Validation
    1. Running Model
    2. Viewing Output
    3. Troubleshooting
    4. Validation