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Add mesh level zones, which can be used to edit element levels and create sloped surfaces.
Mesh level zones can be used to define zones that require ground level modification.
The ground level at each zone vertex is determined from the ground model used during the meshing process, or from user-defined values. This allows greater flexibility and for sloped surfaces to be defined.
Adjustments to zone vertex levels are applied, and mesh element elevations within the zone are calculated from the resulting surface instead of the ground model.
The method of adjustment is selected in the Polygons window, Mesh level zone tab, Type field, which has numerous options. Visit the InfoWorks ICM Help topic, Mesh Level Zones for more information about the available options.
Open a 3D view window for this example:
The bridge and road deck have been cleaned from the ground model, which is common. As this represents an important flow path, the goal is to build it into the mesh.
Start by adding a new polygon object:
To quickly add the road surface for a bridge into the mesh:
For the Specify type, elevations at mesh level zone vertices are set to a user defined value, obtained from the ground model, or interpolated from other zone vertices as specified. This allows for changing the topography of the mesh level zone, as individual vertex elevations can be adjusted.
This generates an interpolated surface between them. Additional elevation adjustments can also be made, if necessary.
Regenerate the mesh to include the changes from the mesh level zone:
The effect is best seen in 3D view:
The 2D elements within the mesh level zone now have ground levels set from the interpolated levels to form a high-level road deck.
The next consideration for this model is whether flow should be allowed to pass under the road deck, which requires the use of a conduit 2D link.
If any changes are made to a mesh level zone after meshing the 2D zone, recalculate mesh elevations within the 2D zone. This can be done by resampling elevations for selected 2D zones.