Emilie Nielsen at 03:24, 5 April 2024

2024-04-05T03:24:35Z

← Older revision		Revision as of 13:24, 5 April 2024
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	== Introduction ==		== Introduction ==
	This page details the method for using ArcGIS 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 [[Tutorial_Module01_Archive#~~Control_Files_and_Boundary_Condition_Database~~ \| ~~the module~~ 1 ~~page~~]]). We will create three different boundaries:		This page details the method for using ArcGIS 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 <u>[[Tutorial_Module01_Archive#TUFLOW_Boundary_Condition_Database_.28bc_dbase.29 \| Module 1]]</u>). We will create three different boundaries:
	* Upstream flow boundary		* Upstream flow boundary
	* Downstream water level - flow (stage-discharge) boundary		* Downstream water level - flow (stage-discharge) boundary

ElizaCollison at 02:45, 9 January 2023

2023-01-09T02:45:47Z

← Older revision		Revision as of 12:45, 9 January 2023
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	== Conclusion ==		== Conclusion ==
	ArcMap has been used to create the 2d_bc layer that contains an upstream "QT" type inflow boundary and a downstream "HQ" stage-discharge type boundary. A second ArcMap layer (2d_sa) defines an internal source boundary. Our next step is to assign hydrographs to the boundary locations created in this page. Please return to the tutorial model page [[~~Module1_test_Archive~~#TUFLOW_Boundary_Control_File_.28TBC.29_Updates\|here]].		ArcMap has been used to create the 2d_bc layer that contains an upstream "QT" type inflow boundary and a downstream "HQ" stage-discharge type boundary. A second ArcMap layer (2d_sa) defines an internal source boundary. Our next step is to assign hydrographs to the boundary locations created in this page. Please return to the tutorial model page [[Tutorial_Module01_Archive#TUFLOW_Boundary_Control_File_.28TBC.29_Updates\|here]].

ElizaCollison: Created page with " == Introduction == This page details the method for using ArcGIS to create the GIS based boundary layer files. Once the GIS layers are setup (detailed in this page), these ar..."

2023-01-09T02:22:38Z

Created page with " == Introduction == This page details the method for using ArcGIS to create the GIS based boundary layer files. Once the GIS layers are setup (detailed in this page), these ar..."

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== Introduction ==
This page details the method for using ArcGIS 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 [[Tutorial_Module01_Archive#Control_Files_and_Boundary_Condition_Database | the module 1 page]]). We will create three different boundaries:
* Upstream flow boundary
* Downstream water level - flow (stage-discharge) boundary
* Internal flow boundary
The first two boundaries are input into a 2d_bc type GIS layer. The third boundary (internal flow boundary) will be applied in a 2d_sa type GIS layer. 

== Method ==
===2d_bc Type Boundaries===
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. 
''Note: This line orientation is recommended for 2d_bc QT, HQ and HT boundary inputs. Care should be taken to digitise these boundary types perpendicular to flow direction (i.e. across the waterway). If they are digitised oblique to the flow (i.e. not perpendicular) model instabilities can result in some cases.''
<ol>
<li>Open the '''2d_bc_empty_L.shp''' template file from the '''TUFLOW\model\gis\empty\''' folder, by either dragging it using Windows explorer or using ''Layers >> Add Data''.</li>
<li> Save a copy of the shapefile as '''2d_bc_M01_002_L.shp''' in the '''TUFLOW\model\gis\''' folder. To do this right click on file in the table of contents, and select ''Data >> Export Data''. When prompted select '''Yes''' to add the exported data to the map as a layer.</li>
<li> Remove the '''2d_bc_empty_L''' (right click and select remove)'''.</li>
<li>Add the '''2d_code_M01_002_R.shp''' from the '''TUFLOW\model\gis\''' folder. This layer, which we created earlier, sets the active model area. These external boundary should be snapped to the code polygon, this ensures that there are no active cells behind the boundary (which can cause spurious flow circulations) or null cells between the boundary and the active model area (no flow can enter or leave the boundary).</li>
<li>Open the DEM from the '''Module_Data\DEMs\ArcGIS\DEM_M01.img'''. This makes it easier to locate the correct boundary locations.</li>
The ArcMap window should resemble the image below: 

[[File:Tute M01 Arc 2d bc 1.png|frame|none]]
 
We will first digitise the inflow boundary at the lower left of the map window above. To do this:
<li>Select ''Editor >> Start Editing''.</li>
[[File:Tute M01 Arc Start Editing.png|frame|none]]
 
<li>To set the layer to snap the 2d_bc to select ''Editor >> Snapping''.</li>
[[File:Tute M01 Arc Editor Snapping.png|frame|none]]
 
<li>In the snapping window, select the check boxes, for the '''2d_bc_code_M01_002_R''' layer, to enable snapping to items in that layer.</li>
[[File:Tute M01 Arc Snapping Options.png|frame|none]]
 
<li>In the Editor Toolbar ensure that: 
*The task is set to "Create New Feature"
*The "Target" is '''2d_bc_M01_002_L''' 
Then select the Sketch Tool (the pencil icon in the image below).</li>
[[File:Tute M01 Arc 2d bc 2.png|frame|none]]
<li>To draw the line, first hold the "V" key down, this makes the vertices on the 2d_code_M01_002_R layer visible. Draw a line that connects the four vertices in the location show below (start at the end vertic and click on the intermediary vertices) . When finished, right click and select "Finish Sketch", alternatively hit the "F2" on the key.</li>
[[File:Tute M01 Arc 2d bc 4.png|frame|none]]
 
<li>Right click on the newly created line and select "Attributes"</li>
[[File:Tute M01 Arc 2d bc 5.png|frame|none]]
<li>In the attributes window set the following: 
*Type = QT
*Name = FC01 (that is FC Zero One).

The type "QT" designates this as flow ("Q") versus Time ("T") boundary. As per the window below.</li>
[[File:Tute M01 Arc 2d bc inflow att.png|frame|none]]
 
<li>At the downstream boundary, sketch another line connecting the four vertices shown below.</li>
[[File:Tute M01 Arc 2d bc 6.png|frame|none]]
 
<li>In the attributes window set the following: 
*Type = HQ
*b = 0.01

The remaining attributes are to be left blank (including the name). As per the window below. 
The type "HQ" designates this as a Water Level ("H") versus Flow ("Q") boundary. This is a stage-discharge boundary condition. If a Name is specified, the user must define this stage-discharge relationship in the boundary database. In this case a water surface slope value (in metres per metre) is specified via the "b" attribute (0.01 is a 1% water surface slope). TUFLOW will automatically create a stage-discharge curve flow this location, based on the underlying topography, roughness and specified water surface slope.</li>
[[File:Tute M01 Arc 2d bc downstream att.png|frame|none]]
<li>In the ''Editor'' toolbar select ''Stop Editing'' and when prompted, save the edits. This 2d_bc layer is now ready for input into the TUFLOW model.</li>

</ol>
===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.
<ol>
<li>Open the '''2d_sa_empty_R.shp''' template file from the '''TUFLOW\model\gis\empty\''' folder, by either dragging it using Windows explorer or using ''Layers >> Add Data''.</li>
<li> Save a copy of the shapefile as '''2d_sa_M01_002_R.shp''' in the '''TUFLOW\model\gis\''' folder. To do this right click on file in the table of contents, and select ''Data >> Export Data''. When prompted select '''Yes''' to add the exported data to the map as a layer.</li>
<li> Remove the '''2d_sa_empty_R''' (right click and select remove)'''.</li>
We will digitise the inflow boundary that covers the dam location shown below:</li>
[[File:Tute M01 Arc 2d sa location.png|frame|none]]

<li>To digitise the inflow region object select ''Editor >> Start Editing''. Ensure that the "Create New Feature" and Target (2d_sa_m01_002_R) are correct and then select the sketch tool. 
Digitise a polygon around the dam.</li>
[[File:Tute M01 Arc 2d sa 1.png|frame|none]]
<li>When finished drawing the polygon, right click and select "Finish Sketch", alternatively hit the "F2" on the key.</li>
<li>Use the "Edit Tool", select the newly created region object, right click and select 'Attributes". 
Enter "FC04" (FC zero four, without the quotes) into the name attribute field. Note that as the object is in the 2d_sa (2d source-area type GIS layer) we do not need to specify a boundary type.</li>
[[File:Tute M01 Arc 2d sa 2.png|frame|none]]
 
<li>To finish editing the layer, select ''Editor >> Stop Editing'' and when prompted save the changes.</li>
</ol>

== Conclusion ==
ArcMap has been used to create the 2d_bc layer that contains an upstream "QT" type inflow boundary and a downstream "HQ" stage-discharge type boundary. A second ArcMap layer (2d_sa) defines an internal source boundary. Our next step is to assign hydrographs to the boundary locations created in this page. Please return to the tutorial model page [[Module1_test_Archive#TUFLOW_Boundary_Control_File_.28TBC.29_Updates|here]].

Tute M01 Boundaries Arc Archive - Revision history

Emilie Nielsen at 03:24, 5 April 2024

ElizaCollison at 02:45, 9 January 2023

ElizaCollison: Created page with " == Introduction == This page details the method for using ArcGIS to create the GIS based boundary layer files. Once the GIS layers are setup (detailed in this page), these ar..."