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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 the <u>[[Tutorial_Module01Tutorial_Module01_Archive#Control_Files_and_Boundary_Condition_DatabaseTUFLOW_Boundary_Condition_Database_.28bc_dbase.29 | the moduleModule 1 main page]]</u>). We will create three different boundaries:
* Upstream flow boundary
* Downstream water level - flow (stage-discharge) boundary
* Internal flow boundary
 
The first two boundaries are inputtedinput into a 2d_bc type layer. The third boundary (internal flow boundary) will be applied as a source-area boundary in a 2d_SA boundary type layer.<br>
 
== Method ==
===2d_bc typeType boundariesBoundaries===▼
 
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 have been aligned perpendicular to flow direction. <br>
▲===2d_bc type boundaries===
We''Note: willThis createline theorientation 2d_bcis boundariesrecommended first.for These2d_bc boundaries areQT, externalHQ and willHT "snap"boundary to the edge of our active model area. Both of these boundaries should be aligned perpendicular to flow directioninputs. Care should be taken to digitise these boundariesboundary types perpendicular to flow direction (i.e. across the waterwayswaterway). WeIf willthey revieware digitised oblique to the flow patterns(i.e. innot theperpendicular) vicinitymodel of theinstabilities boundariescan laterresult in thissome tutorialcases.''
▲<ol>
<li>Load the DEM '''Module_Data\DEMs\SAGA\DEM_M01.sgrd'''</li>
<li>Load the code polygon '''TUFLOW\model\gis\2d_code_M01_002_R.shp'''</li>
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<li>In the data tab, right click on the 2d_bc_M01_002_L layer and select "Save".</li>
[[File:Tute M01 Saga 2d bc 7.png|frame|none]]
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===2d_sa typeType boundaryBoundary===
The next step is to create an internal inflow boundary using a source-area inflow this is done with a 2d_sa type layer.
<ol>
<li>Load the '''2d_sa_empty_R.shp''' template file from the '''TUFLOW\model\gis\empty\'''. Save a copy of the layer in the '''TUFLOW\model\gis\''' directory as '''2d_sa_M01_002_R.shp'''.</li>
<li>Load the newly created 2d_sa_M01_002_R file and close the template file.</li>
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<br>
<li>Save the file, by right clicking on it in the data tab and selecting save.</li>
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== Conclusion ==
SAGA has been used to create the a 2d_bc layer that contains an upstream "QT" type inflow boundary and a downstream "HQ" stage-discharge type boundary. A second SAGA layer created from the (2d_sa template) defines an internal source-area boundary. Please return to the tutorial model page [[Module1_test#Define_Boundary_Conditions|here]], where theOur next step is to assign hydrographs to the inflow boundary locations created in this page. Please return to the tutorial model page [[Tutorial_Module01_Archive#TUFLOW_Boundary_Control_File_.28TBC.29_Updates|here]].
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