Difference between revisions of "SWAN GIS Post Processing"

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(Converting SWAN MAT Outputs to NetCDF4)
(Extracting Time Series from netCDF4 Result File (Optional))
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As an optional extension item, to investigate wave conditions at different locations in our model we can extract a timeseries from our SWAN output results.  
 
As an optional extension item, to investigate wave conditions at different locations in our model we can extract a timeseries from our SWAN output results.  
 
<ol>
 
<ol>
<li>input the SWAN NetCDF4 result file noting that you have MAT files you will need to use the [[SWAN_GIS_Post_Processing#Converting_MAT_to_netCDF4 | converter first]].<br>
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<li>input the SWAN NetCDF4 result file noting that if you have MAT files you will need to use the [[SWAN_GIS_Post_Processing#Converting_MAT_to_netCDF4 | converter first]].<br>
  
 
[[File: SWAN_POST_PROCESSING_003.PNG|800px]]
 
[[File: SWAN_POST_PROCESSING_003.PNG|800px]]

Revision as of 01:02, 7 July 2021

Introduction

This page describes how to use the post processing tools in the SWAN GIS plugin. The plugin offers an interface for basic post processing of SWAN model results. With the standard SWAN distribution, grid files can be output as either MAT or text files. The interface offers a tool for processing the MAT file output format to a more user friendly netCDF4 output format. It also offers a tool for extracting point time series files from a netCDF4 output file.

Converting SWAN MAT Outputs to NetCDF4

Start QGIS (version 3.16.3 or later). Under the plugins menu, navigate to the plugins/TUFLOW/SWAN GIS Tools/Post Processing tab:

SWAN POST PROCESSING 000b.PNG
Select your SWAN MAT result file path (if using the suggested paths it should be Moreton_Bay_Waves\SWAN\04_results) and simply press the 'Convert' button:

SWAN POST PROCESSING 001.PNG

By default the output NetCDF will be saved where the original MAT result file was output by SWAN. The SWAN GIS plugin automatically post processes the NetCDF4 file to the same location and uses the same name, just replacing the file extension.For example:

SWAN POST PROCESSING 002.PNG

Extracting Time Series from netCDF4 Result File (Optional)

As an optional extension item, to investigate wave conditions at different locations in our model we can extract a timeseries from our SWAN output results.

  1. input the SWAN NetCDF4 result file noting that if you have MAT files you will need to use the converter first.
    SWAN POST PROCESSING 003.PNG

  2. Input the output file path for the CSV file time series.
    SWAN POST PROCESSING 004.PNG

  3. Create a new CSV file in C:\Tutorial_Module_SWAN_GIS_Tools\Moreton_Bay_Waves\QGIS called POINTS_XTR_000.csv.
    SWAN POST PROCESSING 005.PNG

  4. Open the CSV file in a text editor and add the below entries as shown. These are the points where time series will be extracted.
    Name X Y
    POINT_01 153.637 -27.477
    POINT_02 153.283 -26.877

    SWAN POST PROCESSING 006.PNG

  5. Set the points file input to the newly created CSV file.
    SWAN POST PROCESSING 007.PNG

  6. Press the extract button to execute the time series extraction. Once complete, navigate to the output path. Separate files would have been output for each input point.
    SWAN POST PROCESSING 007.PNG


Conclusion

You have now worked through the post-processing options available in the SWAN GIS Tools. You can now return back to the main tutorial page.