View source for 1D Open Channels

=Introduction=
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.<br>

'''Examples of open channels that could be modelled in 1D''' <br>
[[File:Photo 04-12-2014 09 54 45.jpg|thumb|none|400px|London, UK (pht: Rohan King)]]
<br>

[[File:Sundaycreek.jpg|thumb|none|400px|Sunday Creek, Australia]]
<br>

=Basic Commands=
Within the *.ecf the following commands and files are at a minimum required to a model an open channel:<br>
<br>

<font color="blue"><tt>Read GIS Network</tt></font> <font color="red"><tt>==</tt></font><tt>..\model\mi\1d_nwke_xxxxx.MIF</tt>        ! network layer containing "S" channel alignments <br>
<font color="blue"><tt>Read GIS Table Links</tt></font> <font color="red"><tt>==</tt></font><tt>..\model\mi\1d_xs_xxxxx.MIF</tt>      ! corresponding cross-section polylines <br>
<br>
The tutorial model [[Tutorial_M11 | here]] runs through the necessary layers and setup for a 1D open channel within a model.

==Circulations==

==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 the <u>[https://docs.tuflow.com/classic-hpc/manual/latest/ TUFLOW Manual]</u>. 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 <u>[[Tutorial_M11_001_GIS_Inputs_QGIS_GPKG#2D_Breaklines | here]]</u>.

<font color="blue"><tt>Read GIS Z HX Line</tt></font> <font color="red"><tt>==</tt></font><tt>..\model\mi\2d_bc_xxxxx.MIF</tt>        ! Uses HX lines and ZP points from a 2d_bc layer <br>

=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 [[TUFLOW_Check_Files | here]]. <br>

{| align="left" class="wikitable" width="20%"

! style="background-color:#005581; font-weight:bold; color:white;"| Filename prefix / suffix
|-
| [[Check_Files_1d_hydroprop | _hydroprop_check.mif<br>_hydroprop_check_L.shp]]
|-
| [[Check_Files_1d_inverts | _inverts_check.mif<br>_inverts_check_P.shp]]
|-
| [[Check_Files_1d_IWL | _iwl_check.mif<br>_iwl_check_P.shp]]
|-
| [[Check_Files_1d_nwk_C | _nwk_C_check.mif<br>_nwk_C_check_L.shp]]
|-
| [[Check_Files_1d_nwk_N | _nwk_N_check.mif<br>_nwk_N_check_P.shp]]
|-
| [[Check_Files_1d_WLLo | _WLLo_check.mif<br>_WLLo_check_L.shp<br>_xWLLo_check.mif<br>_xWLLo_check_L.shp]]
|-
| [[Check_Files_1d_WLLp | _WLLp_check.mif<br>_WLLp_check_P.shp<br>_xWLLp_check.mif<br>_xWLLp_check_P.shp]]
|-
| [[Check_Files_1d_xsl | _xsl_check.mif<br>_xsl_check_L.shp]]
|-
| [[Check_Files_1d_x1d_chans | _x1d_chans_check.mif<br>_x1d_chans_check_L.shp]]
|-
| [[Check_Files_1d_x1d_nodes | _x1d_nodes_check.mif<br>_x1d_nodes_check_P.shp]]
|}

<br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br>
Any further questions please email TUFLOW support: [mailto:support@tuflow.com?Subject=TUFLOW%201D%20open%20channels%20help support@tuflow.com]
<br><br>
{{Tips Navigation
|uplink=[[ TUFLOW 1D Channels and Hydraulic Structures | Back to 1D Channels and Hydraulic Structures]]
}}