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Tute M06 QGIS 2D lfsch Archive: Difference between revisions

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Save your edits. The attributes are described completely in the <u>[https://docs.tuflow.com/classic-hpc/manual/latest/ TUFLOW Manual]</u>. Note that L1, L2, and L3 refer to varying layers, as described in Section 4.7.2.3. We are setting:
* Enter an "Invert" value of 99999 to leave the Zpt levels unchanged (iei.e. use the Zpt elevations modified by the 2d_zsh layer above).
* Percentage blockage below the obvert to account for any blockages perpendicular to the direction of flow (in this case 6% to account for the average blockage due to the bridge piers).
* A Form Loss Coefficient (FLC) below the obvert (in this case to account for sub-grid scale losses around piers). Note that the treatment of the FLC is different depending on the object used to define the flow constriction, i.e. a line or a polygon. The reason for this is to permit the flow constriction to be independent of the model cell size. See the <u>[https://docs.tuflow.com/classic-hpc/manual/latest/ TUFLOW Manual]</u> for more information. In this case, a polygon has been used and the FLC specified is the form loss ''per metre length'' in the predominant direction of flow. FLC values are dependent not on the flow width, but on the length of travel in the direction of flow. Our intention for this study, is to apply a total FLC of 0.3 below the obvert of the bridge. The value entered is therefore 0.3 / 15m which gives a value of 0.02. Refer to latter sections of this tutorial for guidance on how to check the applied FLC.
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</li>[[File:M06_QGIS_2d_Lfcsh_P.png|1000px]]
 
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Add the following attributes to the new points:
{| align="center" class="wikitable" width="25%"
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| L3_Depth || 1 || 1
|}
</li> '''''Tip:''''' It is helpful to make the nodes along the polygon perimeter visible when snapping nodes along its boundary. Right click on '''2d_lfcsh_M06_bridge_001_R''' in the layers section and select properties. In the ''Style'' tab, select the Add Symbol layer tool [[File:Add Symbol.PNG]]. This adds a second symbol layer for the same file. For the first layer set the following options:
 
It is helpful to make the nodes along the polygon perimeter visible when snapping nodes along its boundary. Right click on '''2d_lfcsh_M06_bridge_001_R''' in the layers section and select properties. In the ''Style'' tab, select the Add Symbol layer tool [[File:Add Symbol.PNG]]. This adds a second symbol layer for the same file. For the first layer set the following options:
* Set the ''Symbol Layer Type'' to '''Outline: Marker Line'''
* Set the ''Marker placement'' to '''On Every Vertex'''
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