Tutorial M11 001 GIS Inputs QGIS: Difference between revisions

<li>Click 'OK' and save the workspace by selecting Project > Save As.<br>

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<li>Set the 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>.

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<li>Use the 'Identify Features' tool to inspect a cross section line. Each line has a unique name in the 'Source' attribute field that links to a cross section csv contained within the '''xs''' folder. Type attribute 'XZ' specifies distance vs elevation cross section: <br>

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<li>Open the TUFLOW Viewer, the 1d_xs file automatically appears with a time series result 'XZ' showing. Select a 1d_xs line and view the cross section: <br>

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:* W - weir.

:* X - connecting channel used for side channels entering the main channel.

<li>Use the 'Identify Features' tool to inspect the attributes of the three 1d_nwk types:<br>

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<li>Use the 'Identify Features' tool to inspect the attributes of the three boundaries. A QT type (flow vs time) hydrograph is used to apply flow at the upstream boundary and a HQ (water level vs flow) boundary is used to remove flow from the downstream boundary based on a water level vs flow curve:<br>

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<li>Two culverts within the open channel link upstream 1D channel to the downstream 1D channel underneath the roads, the culvert to the east is embedded into the 2D domain directly. Use the 'Identify Features' tool to inspect the attributes:<br>

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<li>The 2d_bc SX points are snapped to the 1d_nwk culvert:<br>

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<li>The CN lines connect the HX lines to the 1D channel. Where a CN line is connected to the HX line, the water level from the 1D nodes is transferred to the HX line. In between 1D nodes a linear interpolation of water level is applied. <br>

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:*No ‘Z’ attribute is specified, the elevations are taken from the 2d_zsh point layer.

:*The breakline has the same Shape_Width as the cell size, this is a thick breakline modifying whole cells.

<li>The 2d_zsh point layer is used to apply elevation to the breaklines:

:*The values in the 'Z' attribute are elevations assigned to each point and are interpolated along the breakline.

 

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<li>The 2d_code layer is used to deactivate the area representing the 1D open channel with attribute of '0'. All cells within the polygon are removed from the 2D computations. <br>

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==Water Level Lines==

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<li>Load the '''1d_wll_M11_001_L.shp''' from the '''Module_11\TUFLOW\model\gis''' folder into QGIS and use the 'Apply TUFLOW Styles to Open Layers'.

<li>The 1d_wll layer must be digitised perpendicular to the flow direction and from left to right looking downstream. An attribute of '2.5' is specified for all lines as a minimum distance interval along the WLL to generate triangulation points. <br>

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<li>Turn off editing to save the edits.<br>

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<li>Right click on the '''0d_rl_M11_001_P''' and toggle on Editing.

<li>Turn off editing to save the edits.<br>

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<li>To ensure the point reporting functionality is correct, it needs to be snapped to the start/end of a 1d_nwk line.

<li>Turn off editing to save the edits. <br>

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