View source for Tutorial M10 001 GIS Inputs QGIS GPKG

= Introduction =
QGIS is used to create, import and view input data.<br>
<br>

= TUFLOW Project Re-Configuration =
Re-configure the TUFLOW project to use and save empty files to the correct folder:<br>
<ol>
<li>Go to Plugins > TUFLOW > Editing > Configure / Create TUFLOW Project.
<li>Change the folder which contains TUFLOW to the '''Module_10''' folder. This is the only change required, the model folder structure and template empty files are supplied from previous model.<br>
Note: The 'results' and 'check' folder get automatically created when the TUFLOW model is run. <br>
<li>Click 'OK' and save the QGIS workspace by selecting Project > Save As.<br>
<br>
[[File:M10_SHP_ConfigureProject.PNG]]<br><br>
<li>Set the QGIS workspace projection to EPSG:32760, see <u>[https://wiki.tuflow.com/index.php?title=Tutorial_Site_Familiarisation_QGIS#Set_the_Projection Set the Projection]</u>.
</ol>
<br>

= Method =
Navigate to the '''Module_10\Tutorial_Data''' folder. Copy the below GIS files into the '''Module_10\TUFLOW\model\gis''' folder:
:*2d_zsh_M10_damwall_001_L
:*2d_vzsh_M10_dambreak_001_R
:*2d_iwl_M10_001_R
:*2d_sa_M10_inflow_001_R

Investigate the supplied files:
<ol>
<li>Open the files, either:<br>
:*Drag and drop all .shp files into the QGIS workspace, or 
:*Select Layer > Add layer > Add Vector Layer and navigate to the '''Module_10\TUFLOW\model\gis''' folder. <br>
<li>The 2d_zsh line layer represents the dam wall:
:*A ‘Z’ attribute of 65 is specified, the elevations are set to 65 metres along the length of the line.
:*The line has the same Shape_Width as the cell size, this is a thick breakline modifying whole cells. 
<br>
[[File:Animation M10 001 GIS 01a.gif]]<br>
<br>
<li>The 2d_vzsh polygon layer represents the location of the dam break:
:*Shape_Width_or_dMax set to less than zero indicates that the vertices along the perimeter of the polygon are used to interpolate elevations. 
:*Trigger_Value sets the simulation time in hours that the dam break is to commence. A value of 1 indicates the dam break begins at 1 hour. 
:*Period sets the time in hours over which the change in elevation occurs. A value of 0.25 sets a period of 15 minutes replicating the break.
For more information, see Table 6-9 of the <u>[https://downloads.tuflow.com/_archive/TUFLOW/Releases/2018-03/TUFLOW%20Manual.2018-03.pdf 2018 TUFLOW Manual]</u>.<br>
<br>
[[File:Animation M10 001 GIS 02.gif]]<br>
<br>
<li>The 2d_iwl polygon layer represents the initial water level of the dam as 59m at all cells within the polygon.<br>
<br>
[[File:Animation M10 001 GIS 03.gif]]<br>
<br>

<li>The 2d_sa layer replaces the 2d_bc QT type introduced in <u>[[Tutorial_M01 | Module 1]]</u>. A 2d_sa inflow is typically more stable in situations of fast model changes, for example, dam breaks. <br>
<li>Select the '''2d_sa_M10_inflow_001_R''' in the Layers panel and use the 'Apply TUFLOW Styles to Current Layer' tool.<br>
<br>
[[File:Animation M10 001 GIS 04.gif]]<br>
<br>
</ol>
Increment the 2d_bc layer from Module 01 and remove the upstream inflow:
<ol><li>Navigate to the '''Module_10\model\gis''' folder and open the '''2d_bc_M01_001_L.shp''' in QGIS.
<li>Select the '''2d_bc_M01_001_L''' layer in the Layers panel.
<li>Use the 'Apply TUFLOW Styles to Current Layer' tool.
<li>Click on the ‘Increment Selected Layer’ symbol from the TUFLOW Plugin toolbar.
<li>Update the 'Output Layer Name' to '''2d_bc_M10_001_L.shp'''.
<li>Click 'OK'.<br>
<li>The tool removes the source layer from the Layers panel and the '''2d_bc_M10_001_L''' appears.
<li>Right click on the '''2d_bc_M10_001_L''' layer to toggle on Editing. 
<li>Zoom to the upstream inflow, select and delete the line. 
<li>Click 'OK' and turn off editing to save the edits.<br>
<br>
[[File:Animation M10 001 GIS 05.gif]]<br>
</ol>
<br>

=Conclusion=
:*A 2d_zsh layer was checked to enforce a dam wall in the model.
:*A 2d_vzsh layer was inspected to simulate a break in the dam wall.
:*A 2d_iwl layer was reviewed setting the initial water level within the dam upstream of the dam wall. 
:*The original upstream inflow was removed from the model, replaced by a source area boundary.

<br>
{{Tips Navigation
|uplink=[[Tutorial_M10#GIS_Inputs| Back to Module 10 Main Page]]
}}