SMS:TUFLOW Boundary Conditions
TUFLOW Boundary conditions may be defined at nodes, arcs, or polygons in a Boundary Conditions Coverage.
Boundary Condition Locations
1D Boundary Conditions at Nodes
Boundary conditions defined at points are 1D boundary conditions and must be placed at the same location as a 1D boundary node. (See Snapping Feature Objects) The boundary condition information is specified in the BC Node Attributes Dialog.
2D Boundary Conditions at Arcs
Arcs can be used to define 2D Boundary conditions applied to the 2D domain. The BC attributes are specified in the BC Arc Attributes Dialog.
2D Boundary Conditions for Polygons
Polygons can be used to define rainfall applied to 2D domains or to specify active/inactive information for 2D domains. The BC Polygon Attributes dialog specifies the type of information stored with the polygons.
Events
Every boundary condition should be setup for each event that will be used with the boundary condition. The events can be defined by clicking on the Add/Remove Events button. The list of events is common to all the boundary conditions in the project.
Options
Depending upon the type of boundary condition, there are several additional boundary condition options.
- Override Component Identifier – SMS creates a default unique boundary condition identifier based upon the coverage and id of the arc. You can override this value to more easily find boundary condition information in the TUFLOW check, and log files.
- Spline curve – If this option is on, TUFLOW will smooth the boundary condition curve using a spline algorithm. This should generally only be used for smooth, cyclic boundary conditions such as a tidal boundary.
Boundary Condition Types
The types of boundary conditions available depend upon whether the boundary condition is at nodes, arcs, or polygons.
| Type | Available Locations | Description |
|---|---|---|
| Not used | Points, Arcs | No boundary condition exists at the location. |
| Flow vs Time | Points, Arcs | Sets the flowrate as a curve through time. |
| Flow vs Wse | Points | Sets the flowrate based upon a relationship with the water surface elevation. |
| Wse vs Time | Points, Arcs | Sets the water surface elevation as a curve through time. |
| Wse vs Flow | Points, Arcs | Defines a relationship to determine the water surface elevation from a flowrate. The relationship can be specified or TUFLOW can compute it using water surface slope. |
| 1D Flow/2D Water Level Connection (HX) | Arcs | Defines the interface between a 1D and 2D domain. See Combining 1D and 2D Domains. |
| Non-directional Flow vs Time | Arcs | Defines a flowrate that enters along each cell of the boundary. |
| Non-directional Flow vs Wse | Arcs | Defines a flowrate that enters along each cell of the boundary based upon a relationship to the water surface elevation. |
| Flow Source from 1D model (SX) | Arcs | Defines an interface between a 1D and 2D domain which is often useful for curlverts rather than using the 1D Flow/2D Water Level Connection. |
| Flow/Rainfall over Area | Polygons | Defines either an amount of flow entering the polygon (applies to all wet cells or lowest cell if none) or rainfall amounts (applies to all cells in the polygon). |
| Cell Codes | Polygons | Specifies whether cells are active or inactive and whether or not they will be included in the mesh output files. |
Modules: Mesh Module · Cartesian Grid Module · Scatter Module · Map Module · GIS Module · Particle Module
Models: ADCIRC · BOUSS-2D · CGWAVE · CMS-Flow · CMS-Wave · FESWMS · FVCOM · Generic Mesh Model · GENESIS · HYDRO AS-2D · PTM · SRH-2D · Steering · STWAVE · TABS · TUFLOW
