SMS:Define TUFLOW domain

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TUFLOW supports 2D domains, 1D cross section based domains, and 1D pipe network domains. Multiple domains of each type can be used within the same TUFLOW simulation. To use multiple 2D domains in TUFLOW, purchase the add-on module.

Types of Domains

2D Domains

Two-dimensional domains are Cartesian grid (rectilinear) and include elevation data.

TUFLOW 2D domains are cartesian (rectilinear) grids. 2D domains are created using a Cartesian grid frame inside a TUFLOW Grid Extents coverage.

Grids store elevation values at each corner, midside, and center. There are several grid options that apply to a grid that can be specified by right-clicking on the grid and choosing Properties.

A 2D domain is represented as a 2D geometry component in the TUFLOW interface. A 2D geometry component includes the grid and associated coverages.

Grid elevations can be modified using the Select Grid Cell SMS Select Cell Cell Tool.svg tool or Select Grid Cell Points TUFLOW Select Cell Grid Points Tool.svg tool to select and change the z values at specific directions. A TUFLOW 2D Z Lines/Polygons (Simple) coverage can also be used to force elevations using arcs or polygons.

Multiple grids can be used inside the same simulation. The grid used in each area of the domain is specified using a TUFLOW 2D/2D Link coverage.

1D Cross Section Domains

Cross section based domains include channel and cross section definitions.

1D cross section domains use both the TUFLOW Network coverage and the TUFLOW Cross Section coverage. The Network coverage describes the channel attributes such as the length and the cross sections are defined in the Cross Section coverage.

1D Pipe Network Domains

Pipe network domains can be used to model such things as culverts and storm sewers.

1D pipe networks are created using culvert channels inside a 1D Network coverage. The shape of the pipe segments are specified using the Attributes button in the Channel Attributes dialog.

Channel inlets, storage, and invert elevations can be defined on the arc nodes (endpoints).

Starting in version 10.1, it is possible to create custom inlet definitions and use them within the pipe network model. See TUFLOW Inlet Database

Combining Multiple Domains

1D to 2D Domains

A very powerful and useful feature in TUFLOW is the ability to combine a 1D cross section domain and a 2D domain. This method can be used to embed a 2D domain between two 1D domains, embedding pipe networks, or to model the channel in 1D and floodplain in 2D. See Combining 1D and 2D Domains.

2D Domain to 2D Domain

One of the disadvantages to TUFLOW is that it uses a fixed grid rather than a mesh which can transition very well from large to small cells. This can be overcome somewhat by using 1D and 2D domains. TUFLOW also supports using multiple 2D domains of different resolutions. The SMS interface makes it easy to set up. See Linking 2D Domains.

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