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==Introduction== This page details the method for using QGIS to create the GIS based boundary layer. The layer will be populated with the name of each inflow boundary whi..."

2023-01-09T00:42:13Z

Created page with "<ol> ==Introduction== This page details the method for using QGIS to create the GIS based boundary layer. The layer will be populated with the name of each inflow boundary whi..."

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==Introduction==
This page details the method for using QGIS to create the GIS based boundary layer. The layer will be populated with the name of each inflow boundary which will be linked to the boundary database (created in [[Module1_test_Archive#Define_Boundary_Conditions|Module 1]]) in the following steps of this module. The created boundary will be applied as a source-area boundary in a 2d_sa layer. 
==Method==
<li>Copy the layer '''2d_sa_M07_001_R''' within the '''Module_data\Module_07\Inflow folder''' into the '''TUFLOW\model\gis''' folder.
<li>Open the layer in QGIS. Four polygons have been digitised over the location of the proposed development. Each polygon represents a sub-catchment to which different inflow boundaries will be associated. Populate the first and only attribute of each polygon with the name of the inflow boundary as shown in the figure below. The next steps of this module will link these boundary names with an inflow using the bc_dbase created in Module 1. 
 
[[File:M07 SA polygons QGIS.png|700px]]
 
<li>Save the layer '''2d_sa_M07_001_R'''. 
 
'''Boundary Condition Database'''
<li>Copy the file '''100yr2hr_loc.csv''' from '''Module_data\Module_07\Inflow''' and place it into the '''TUFLOW\model\bc_dbase''' folder. This file contains the four hydrographs that will be used.
<li>Open up the latest version of the boundary condition database which was used when simulating the model in Module 6. This is located within the '''TUFLOW\model\bc_dbase folder''' and is called '''bc_dbase_M04.csv'''.
<li>We need to add four additional rows to the file which reference the four additional inflows that have been created in the layer '''2d_sa_M07_001_R'''. The revised bc_dbase should look like the figure below: 
 
[[File:M07 bcdbase.png]] 
 
The hydrographs applied to each of the 2d_sa polygons are contained within the source file '''100yr2hr_loc.csv'''. 
[[File:100yr2hr loc.PNG|800px]]
 
<li>Save the bc_dbase as '''bc_dbase_M07.csv'''. It is now ready to be used within the model.

==Conclusion==
A GIS layer has been created containing four polygons in a 2d_sa layer over the location of the proposed development. The existing boundary conditions database (bc_dbase) has been modified to link these four GIS objects to hydrographs within an external csv file. [[Tutorial_Module07_Archive#Modify_Simulation_Control_Files_and_Set-up_a_TUFLOW_Scenario | Please return to the main page of module 7]].

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Tute M07 QGIS 2D SA Archive - Revision history

ElizaCollison: Created page with " ==Introduction== This page details the method for using QGIS to create the GIS based boundary layer. The layer will be populated with the name of each inflow boundary whi..."

ElizaCollison: Created page with "
==Introduction== This page details the method for using QGIS to create the GIS based boundary layer. The layer will be populated with the name of each inflow boundary whi..."