Caroni – Page 2 – Mapping T&T

Boundary Conditions – Normal Depth

From the previous post, we saw that water was not leaving the model, causing a build up of water at the downstream end (although the downstream end is the Caroni Swamp where we expect water to be). To fix this, we add a Boundary Condition Line at the downstream end of the model. in RASContinue reading “Boundary Conditions – Normal Depth”

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, andContinue reading “View Results”

Create the Plan and Run the Model

The Plan file contains the settings used to run the model such as the simulation window, what time steps to use, and what equation sets to use. The main things that we will do for now is ensure that the geometry and Unsteady Flow files are associated, and enter the Simulation Time Window. Here IContinue reading “Create the Plan and Run the Model”

Apply Precipitation

Now we will set the rainfall that will be applied to the mesh during the simulation. I will most likely have a few posts on how to actually go about developing this rainfall table, but the goal for now is just to get a working model and then make it better. So in interest ofContinue reading “Apply Precipitation”

Create a Mesh

The mesh is what makes it a 2D model. Read the RAS documentation to learn more about the properties of the 2D mesh including computation points and cell faces. In a 1D model, rivers are modelled using cross-sections across the floodplain, distributed along the river. In a 2D mesh, I think to think of theContinue reading “Create a Mesh”

Create a Terrain

Now that we have a project setup and a projection defined, we can import the terrain. It is recommended that you clip the terrain raster to a buffer of the basin boundary. I used a buffer of 1km because if any part of 2D mesh extends beyond the terrain, the model will not run. IContinue reading “Create a Terrain”

Setup the RAS Project

Starting a new RAS project is always exciting, possibly because my mistake counter is at 0. I am using HEC-RAS 6.4.1 since that is the latest version as of right now. Project Naming An end user should be able to get a general idea of the project from the file name. Any file (and folder)Continue reading “Setup the RAS Project”

Delineate the Basin Boundary

We need to delineate the basin boundary if we want to build a 2D model of a watershed. A watershed is an area of land that drains all the streams and rainfall to a common outlet such as the outflow of a reservoir, mouth of a bay, or any point along a stream channel. TheContinue reading “Delineate the Basin Boundary”