Meshing M04 Going Further

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Description

In Meshing Module 04 the floodplain mesh cell size was adjusted by redistributing vertices along polygon boundaries. This page demonstrates an alternative, efficient workflow to define floodplain mesh resolution using SMS's constant paving density feature as follows.

MADDY TODO, add links to the below sections in these dot points.

• Access a demonstration license for SMS
• Generate the mesh using constant paving.
• Compare the meshes generated by redistributing the vertices with the constant paving.

Accessing A Demonstration License

To complete the steps shown on this tutorial page it it required to have a maintained license of Aquaveo SMS. If currently unlicensed, an evaluation license of SMS can be requested via: https://evaluate.aquaveo.com/.

Adjust Mesh Resolution

Use the below steps and video to set the resolution using constant paving in the floodplain and dam polygons:

1. Duplicate Floodplain_001 and rename it Floodplain_002.
2. Using the Select Feature Polygon tool hold shift and select the floodplain polygons (refer to video). Right click and select Polygon Attributes.... In the 2D Mesh Polygon Multiple Properties dialog check the Mesh type and from the drop down select Constant Paving (triangles) and set the following:
   • Set Bias to 0.2.
   • Set Size to 10.0 and select OK.
3. Deselect the floodplain polygons and hold shift and select the two dam polygons (refer to video). Right click and select Polygon Attributes.... In the 2D Mesh Polygon Multiple Properties dialog check the Mesh type and from the drop down select Constant Paving (triangles) and set the following:
   • Set Bias to 0.25.
   • Set Size to 8.0 and select OK.
4. Deselect the dam polygons and from the Map Data panel right click on the Floodplain_002 and select Convert > Map -> 2D Mesh. Accept the default name.

Compare Meshes

Review the new mesh and compare with the initial mesh Floodplain_001:

1. Toggle between Floodplain_001 and Floodplain_002 to compare the meshes.
2. When toggling between Floodplain_001 and Floodplain_002 observe how the constant paving of Floodplain_002 transitions from the channel to a target resolution of 10m on the floodplain. By distributing vertices alone, as per Floodplain_001 the cell size on the floodplain is typically between 4 to 6 m.
3. Zoom into a section of the channel and notice how the constant paving mesh transitions from the channel into the floodplain.

Discussion

Constant paving density makes it easier to achieve a target cell size for areas such as floodplain (for example 10m) than via the default mesh generation method. This is done while still providing detail in areas of interest (for example roads, controls or the main channel). Constant paving density will generally result in a mesh with less cells where they are not required and a faster model runtime for TUFLOW FV. To learn more about constant paving visit SMS Paving.

Conclusion And Next Steps

Well done on completing the Going Further section Meshing Module 4.

Return to the Meshing Module 4.