Here is a different style of map that I don’t use very often. It is a 3D view of the Maracas Watershed, Trinidad. The purpose of this map is just to appreciate the topography of the watershed. Its interesting that the headwaters of the valley is pretty wide, then narrows moving downstream towards the CaroniContinue reading “Maracas Watershed 3D Map”
Tag Archives: Trinidad
Trinidad Large Steelbands Map (North)
In honour of Carnival and Panorama season, here is a map of the Large Steelbands in Port-of-Spain. Special shout out to my old band – Silver Stars. I definitely miss the excitement of Carnival. The purpose of this map is to locate the bands to plan that perfect “panyard crawl” night. It is based onContinue reading “Trinidad Large Steelbands Map (North)”
Trinidad Watershed Map
A map of the watersheds and hydrometric units in Trinidad It is based on the Adopt-A-River watershed map here: https://www.adoptarivertt.com/archived/watersheds/watershed-maps/ The Adopt-A-River maps are clean and easy to read. I added a basemap to provide more context and also wanted to decrease the size of the legend. Used the Open Street Map basemap as theContinue reading “Trinidad Watershed Map”
2D Mesh Breaklines
In the Viewing the Results post, we saw the neat Particle Tracing feature in RAS Mapper, which us to easily visualize the movement of water. However, if we look closely enough, things look a bit strange. The particles seem to be going straight through that road embankment (The Priority bus Route) as if it doesn’tContinue reading “2D Mesh Breaklines”
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”
Mapping T&T 