Sep 22 2011

2-D Model Output

Just as the input to 2-D models are more comprehensive and data intensive than 1-D models, the results also provide a more complete picture of what’s going on hydraulically.  All of the results I have shown in previous posts have been from steady state models.  The model of Hampton Harbor that I am using as an example are for a dynamic tidal model.  I can get a snap shot of any specific time step, but I can also produce some videos that show the entire length of the model. 


Results are calculated at every node in the model.  So areas that you are most interested in should contain more nodes and elements than the rest of the model.  That way you will get a more detailed representation of that area as well as more detailed results.  The standard results from a 2-D model include depth, water surface elevation, and velocity.  The velocity results include a vector as well that includes an x and y direction and magnitude.  The calculated velocity is depth averaged.

Results shown below are from various time steps of a 500 year hurricane storm surge simulation.



Water Surface Elevation




velocity with vectors

Film Loops

With dynamic models you can produce film loops of all the results.  Below are a few examples showing how the water surface elevation propagates throughout the model.  I also created a few different videos of the velocity results as well.

Water Surface Elevation




Velocity near bridge


Additional Results

In addition to the standard set of results you can calculate several additional values using the available data.  Some possible hydraulic examples are Froude #, Velocity Head, Energy Elevation, and Shear Stress.  You can also use multiple results to find areas of interest.  If you know a certain type of fish loves to hang out where the water is 1’-4’ deep, and in calm water say with a velocity under 1 ft/s, you can determine the spatial locations of possible habitat locations.  Anything that you might need to know that’s related to a hydraulic parameter can be calculated and plotted within it’s geospatial context.  Below are a few examples.

Water Surface Elevation


Velocity Head

Velocity Head-e



2-D Results as Art

Because of the endless options of contours settings and colors, as well as the unique site hydraulics and possible meshes, I have always thought of 2-D models as a unique kind of art form.  Any body have any eye catching results from 2-D models you have run?

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