Overview
This lecture provides a crash course on 2D modeling in InfoWorks ICM, focusing on the use, setup, and best practices for 2D polygons and line objects, as well as meshing and result analysis.
2D Polygons in InfoWorks ICM
- 2D polygons represent objects like buildings, allowing adjustments in elevation, drainage, and green roof controls.
- Initial condition polygons can set water quality, sediment transport, infiltration, or hydraulic zone starting parameters.
- Mesh zones and mesh level zones override mesh detail or modify ground elevation, with mesh level zones allowing vertex-specific elevation for finer grading.
- Permeable zones and infiltration areas define infiltration properties and direct infiltrated water to nodes for detailed rain or extended analyses.
- Roughness zones assign surface roughness (Manning's n values), and priorities resolve overlaps between polygons.
- Turbulence zones define internal friction from turbulent eddies, affecting simulation accuracy.
2D Line Objects
- 2D boundaries define upstream/downstream limits, with options for wall, normal depth, dry, or set level/flow conditions.
- 2D line sources add inflows anywhere within the model area, assigned with matching profile names.
- Base linear structures (e.g., walls, weirs) are used to model features like dams; failure can be triggered by depth, velocity, or RTCs.
- Bridge and sluice linear structures define bridge/gate geometry and connectivity in the model.
- Porous walls model water-permeable barriers, with adjustable porosity and removal triggers for simulation events.
Meshing Options in 2D Modeling
- Terrain sensitive meshing splits triangular mesh cells when large height variations are detected, improving accuracy in detailed areas.
- Maximum triangle/minimum element area controls mesh resolution.
- 'Classic' and 'clip' meshing methods differ in handling overlapping features; 'clip' helps avoid small, inefficient mesh elements.
Reviewing Simulation Results
- Points, lines, and polygons can be added before running simulations to track elevation, depth, velocity, and flow data.
- Results can be graphed or exported to compare modeled and observed data.
- Polygons allow for area-based analysis, such as inundated area or flow through a region.
Key Terms & Definitions
- 2D Polygon — Area object for buildings or zones with customizable properties.
- Mesh Zone — Area with overridden mesh resolution or elevation.
- Mesh Level Zone — Allows elevation setting at each vertex for detailed terrain edits.
- Permeable Zone — Area controlling infiltration to nodes.
- Roughness Zone — Area assigning surface roughness for hydraulic calculations.
- Turbulence Zone — Area adding friction from turbulent flow.
- 2D Boundary — Line object defining model inflow/outflow boundaries.
- Base Linear Structure — Line object for structural features like weirs/dams.
- Porous Wall — Line for modeling barriers with adjustable water flow through them.
Action Items / Next Steps
- Practice creating and configuring 2D polygons, mesh zones, and line objects in InfoWorks ICM.
- Experiment with different meshing options and roughness settings.
- Review simulation results using points, lines, and polygons for analysis.
- Follow up on any unclear object behaviors or modeling techniques as needed.