1D Open Channels

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Open waterways (channels) are most commonly modelled as "S" type channels, the S signifies a sloping channel that can handle steep, super-critical flows. Open channels can either be modeled as an inertial or non-inertial channel, the latter removes the Courant stability condition and is useful for stabilizing very short S channels with high velocities.

Examples of open channels that could be modelled in 1D

London, UK (pht: Rohan King)

Sunday Creek, Australia

Basic Commands

Within the *.ecf the following commands and files are at a minimum required to a model an open channel:

Read GIS Network ==..\model\mi\1d_nwke_xxxxx.MIF ! network layer containing "S" channel alignments
Read GIS Table Links ==..\model\mi\1d_xs_xxxxx.MIF ! corresponding cross-section polylines

The tutorial model here runs through the necessary layers and setup for a 1D open channel within a model.

Error trapping

  • under construction


1D/2D boundary - alignment of cells

1D/2D boundary - spill level

Ideally the location of the HX polyline, that represents the 1D/2D boundary, should be situated along the bank of the open channel. This is covered more in Section within the TUFLOW manual. In situations where the Digital terrain model does not properly define the bank elevation it can be necessary to include ZP points that are snapped to the HX lines that work in the same way as variable z line modifications. Details on how to set up this GIS layer can be found here.

Read GIS Z HX Line ==..\model\mi\2d_bc_xxxxx.MIF ! Uses HX lines and ZP points from a 2d_bc layer

Typical check files used

The table below highlights some of the commonly used check files when reviewing 1D open channels. The full list of TUFLOW check files can be found here.

Filename prefix / suffix

Any further questions please email TUFLOW support: support@tuflow.com

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