Tute M01 Boundaries SAGA: Difference between revisions
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== Introduction ==
This page details the method for using SAGA to create the GIS based boundary layer files. Once the GIS layers are setup (detailed in this page), these are linked to data using a boundary database, (the boundary database is described in
* Upstream flow boundary
* Downstream water level - flow (stage-discharge) boundary
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We will create the 2d_bc boundaries first. These boundaries are external and will "snap" to the edge of our active model area. Both of these boundaries should be aligned perpendicular to flow direction. Care should be taken to digitise these boundaries perpendicular to flow direction (i.e. across the waterways). We will review the flow patterns in the vicinity of the boundaries later in this tutorial.
<li>Load the DEM '''Module_Data\DEMs\SAGA\DEM_M01.sgrd'''</li>
<li>Load the code polygon '''TUFLOW\model\
<li>Create a new map containing these layers, select both of these in the data tab of the workspace window, right click and select "Show".</li>
<li>Load the template 2d bc type layer (2d_bc_empty_L.shp) from '''TUFLOW\model\
<li>Save a copy of the template under the '''TUFLOW\model\
<li>Open the newly saved, '''2d_bc_M01_003_L.shp''' add it to the map window and close the template.</li>
The SAGA window should now look something like this:<br>
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===2d_sa type boundary===
The next step is to create an internal inflow boundary using a source-area inflow this is done with a 2d_sa type layer.
<li>Load the '''2d_sa_empty_R.shp''' template file from the '''TUFLOW\model\
<li>Load the newly created 2d_sa_M01_003_R file and close the template file.</li>
<li>Add the layer to a map window with the DEM.</li>
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