To build an SRH-2D model in SMS, use the following steps:
1. Start SMS.
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1. Start SMS, or clear existing projects in SMS.
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- If SMS is already running, select File | Delete All.
- A new project can also be started by using CTRL + N.
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2. Import data.
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1. Gather and open image files.
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Images are imported into the GIS module in SMS.
2. Import images from the web.
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3. Review data.
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1. Review elevation data for errors.
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1. Use the Dataset Info dialog.
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- Find the "Z", "elevation" or "depth" datasets on the geometric object (mesh, TIN, grid, raster) that is being reviewed
- Right-click on elevation data and select Info.
- Review information in the Dataset Info dialog to see that the range of values are as expected.
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2. Use contour display options.
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- Turn off Points and Triangles, then turn on Contours in the Scatter tab of the Display Options dialog.
- Set contour options in the Contours tab. The "Color Fill" option is recommended for this.
- Look for inconsistent points (points with values much higher/lower than their neighbors or regions where no data points exist).
- Verify that the region being modeled is covered by the elevation/depth data and there are no holes.
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3. Rotate the elevation data.
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- Use the Rotate tool to examine the elevation data from different angles.
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2. Remove erroneous points and triangles.
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- After reviewing the imported data, points or triangles covering regions where there are no data points should be deleted. This could include outlier points or thin triangles.
2. Manually remove points.
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- Use Select Scatter Point tool to select erroneous points in the scatter set.
- Review and edit point data in the Edit Window.
- Delete erroneous points.
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3. Add breaklines.
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- Select the Create Breakline tool.
- Click along points of a common elevation, such as at a bank toe or levee crest, to connect these points in the surface.
- Use the Backspace key to back up if an erroneous selection is made.
- Double-click or press Enter key to complete the breakline.
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- Review and set object projections.
- Remove erroneous points.
- Add breaklines.
- Merge datasets.
- Stamp new features (channel, roadway embankment, or other).
- See also: Feature Stamping Workflow
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4. Define model limits (domain).
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- Create a Mesh Generator map coverage.
- Digitize arcs to define mesh limits.
- Define mesh density and type (in Mesh Generator coverage).
- Create arcs along key breaklines and notable features (banklines, structures, piers, road embankments, etc.).
- Set vertex spacing on arcs to define mesh element size.
- Specify mesh type for each polygon (pave / patch / none).
- Assign scatter data.
- Generate mesh.
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6. Define materials.
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- Create a SRH-2D Materials coverage.
- Digitize material areas (polygons).
- Define material types and Manning’s roughness values.
- Defining materials from land use GIS data.
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7. Set-up boundary conditions.
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- Create a Boundary Conditions coverage.
- Multiple boundary condition coverages can be created if needed, but only one boundary condition coverage can be added to simulation. Boundary conditions coverages can be merged together if needed.
- Assign boundary conditions to arcs.
- Inlet Q (options).
- Exit-H (options, including new normal/critical depth tool).
- Internal inflows and outflows (highlight approach – hole in mesh).
- Monitoring Lines.
- Optional Wall boundary conditions.
- Structures (culverts, weirs, bridge pressure flow).
- See also: SRH Culvert Workflow, SRH Pressure Flow Bridge Workflow
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8. Set monitoring points.
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- Create a Monitoring Points coverage.
- Create feature points in the coverage.
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9. Define obstructions.
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- Create a SRH-2D Obstructions coverage.
- Add feature arcs and points to coverage.
- Assign obstruction parameters to feature arcs and points.
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11. Review results.
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- Open _XMDF file.
- Results layers.
- Observation lines.
- Summary table.
- Run the Plot Wizard.
- Data calculator.
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12. Compare datasets.
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- Create activity datasets
- Create scalar datasets
- Create vector datasets
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