View Results

Now for the fun part! Now that we have successfully run the RAS model we can take a look at the results. This is easily done in RAS Mapper, which has several different options for viewing the spatial results.

Under the Results section, the ShortID of the event if shown along with Depth, Velocity, and Water Surface Elevation grids. These are set to the Max profile by default. This may not correspond to a single time step, but shows the maximum values at any cells over the entire simulation.

Use the time slider at the top of the window to pan through the simulation to see how the results change. An animation of the simulation can also be played.

Particle Tracing is another fun way to visualize the results. This cannot be done on a Max profile as these results may be compiled from several different time steps, so a single time step must be chosen using the time slider. Particle tracing helps to visualize the movement of water over the terrain.

There are several other results that can be added to RAS Mapper. Right-click on the event and select Create a New Results Map Layer. Options such as the Froude Number, Shear Stress, Arrival Time, and many others can be added to the map. We will go over a few of these in later posts.

Looking at the Depth results at the end of the simulation, we notice that there is a build up of water in the Caroni Swamp (The Caroni-Arena dam is also clearly visible). Now we know that there is water perpetually in the swamp, but nevertheless we want our model to freely drain for now. In the future we can consider the tidal conditions, but for now if we want water to leave our model, we need to add Boundary Condition Lines.