User:Jcreer/SWB: Difference between revisions

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__NOINDEX__
__NOINDEX__
{{Version GMS 10.4}}
{{Future feature}}
The Soil-Water-Balance (SWB) model has been developed by USGS to allow estimates of potential recharge to be made quickly and easily.  
The Soil-Water-Balance (SWB) model has been developed by USGS to allow estimates of potential recharge to be made quickly and easily.  


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*Available soil-water capacity
*Available soil-water capacity
*Surface-water flow direction
*Surface-water flow direction
In addition to gridded land-surface data the model requires tabular daily climatological data (daily precip (inches), average air temperature [F], max air temp [F], min air temp [F]). Additional data may be required depending on model options: (1) daily average wind speed (m/s), (2) daily average relative humidity (%), (3) daily max relative humidity (%), (4) daily percentage of possible sunshine (%). Finally a lookup table must be supplied to assign curve numbers, interception values, rooting depths, and maximum daily recharge values.
In addition to gridded land-surface data the model requires tabular daily climatological data (daily precip (inches), average air temperature [F], max air temp [F], min air temp [F]). Additional data may be required depending on model options:
# daily average wind speed (m/s),  
# daily average relative humidity (%),  
# daily max relative humidity (%),  
# daily percentage of possible sunshine (%).  
Finally a lookup table must be supplied to assign curve numbers, interception values, rooting depths, and maximum daily recharge values.


==Creating an SWB Simulation==
==Creating an SWB Simulation==
To create an SWB simulation, do the following:
To create an SWB simulation, do the following:
# Right-click on the "[[File:Project Icon.svg|15 px]] Project" item the Project Explorer and select ''New Simulation'' | '''SWB'''.
# Right-click on the "[[File:Project Icon.svg|15 px]] Project" item the Project Explorer and select ''New Simulation'' | '''SWB'''.
A new "Simulation Data" [[File:Simulation Data Icon.svg|16 px]] item will appear in the Project Explorer, along with a "SWB Simulations" [[File:Simulation Folder Icon.svg|16 px]] item and a new simulation [[File:Simulation InactiveIcon.svg|16 px]] item. Right-clicking on the "SWB Simulations" [[File:Simulation Folder Icon.svg|16 px]] item also has a '''New Simulation''' command that allows adding additional SWB simulations to the project.


==Simulation Menu==
==Simulation Menu==
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* '''Save, Export, and Launch SWB''' – Combines several other commands together. First, it saves the project file, then exports files for the model run, and finally launches the SWB model run.  
* '''Save, Export, and Launch SWB''' – Combines several other commands together. First, it saves the project file, then exports files for the model run, and finally launches the SWB model run.  
* '''Properties''' – Opens the ''Properties'' dialog which displays the simulation properties and allows adding notes.
* '''Properties''' – Opens the ''Properties'' dialog which displays the simulation properties and allows adding notes.
 
<!--
==Model Control==
==Model Control==
[[File:SWB ModelControl.png|thumb|340 px|Example of the SWB ''Model Control'' dialog]]
The parameters for the SWB model run are set in the ''Model Control'' dialog.
The parameters for the SWB model run are set in the ''Model Control'' dialog.
===Required Inputs===
===Required Inputs===
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**'''Insert Below''' &ndash; Adds a row in the table below the current selected row.
**'''Insert Below''' &ndash; Adds a row in the table below the current selected row.
** '''Delete''' &ndash; Removes the selected row from the table.
** '''Delete''' &ndash; Removes the selected row from the table.
 
-->
==SWB Output Files==
==SWB Output Files==
After running the model, SWB will generate several output files.
After running the model, SWB will generate several output files.
*recharge daily statistics
*Recharge daily statistics &ndash; Contains the minimum, maximum, and mean values for all major components of the water balance for all grid cells in the model on a given day.
*recharge daily report
*Recharge daily report &ndash; Contains values representing the individual daily values summed over the entire model multiplied by the conversion factor.
*recharge annual statistics
*Recharge annual statistics &ndash; Contains mean values representing the annual sum of daily mean values.
*model run log file
*Log file &ndash; Contains a report of the processes performed during the model run.
*grid and image files
*Grid and image files &ndash; Based on the selected optional output variables in the model control.


==External Links==
==External Links==
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{{Navbox GMS}}
{{Navbox GMS}}
[[Category:Numerical Models]]
[[Category:SWB]]

Latest revision as of 17:08, 4 January 2021

The Soil-Water-Balance (SWB) model has been developed by USGS to allow estimates of potential recharge to be made quickly and easily.

Required Input

Four gridded datasets are required:

  • Hydrologic soil group
  • land use/land cover
  • Available soil-water capacity
  • Surface-water flow direction

In addition to gridded land-surface data the model requires tabular daily climatological data (daily precip (inches), average air temperature [F], max air temp [F], min air temp [F]). Additional data may be required depending on model options:

  1. daily average wind speed (m/s),
  2. daily average relative humidity (%),
  3. daily max relative humidity (%),
  4. daily percentage of possible sunshine (%).

Finally a lookup table must be supplied to assign curve numbers, interception values, rooting depths, and maximum daily recharge values.

Creating an SWB Simulation

To create an SWB simulation, do the following:

  1. Right-click on the "Project Icon.svg Project" item the Project Explorer and select New Simulation | SWB.

A new "Simulation Data" Simulation Data Icon.svg item will appear in the Project Explorer, along with a "SWB Simulations" Simulation Folder Icon.svg item and a new simulation Simulation InactiveIcon.svg item. Right-clicking on the "SWB Simulations" Simulation Folder Icon.svg item also has a New Simulation command that allows adding additional SWB simulations to the project.

Simulation Menu

Right-clicking on the simulation item Simulation InactiveIcon.svg in the Project Explorer will bring up the following menu command:

  • Delete – Removes the simualation item.
  • Duplicate Creates a copy for the simulation, including all parameters set in the model control.
  • Rename – Allows changing the name of the simulation item.
  • Model Control – Opens the Model Control dialog where the model run parameters are set.
  • Model Check – Looks for potential errors in the model setup. Brings up the Model Checker dialog if issues are discovered.
  • Export SWB – Generates files used in the model run.
  • Launch SWB – Starts the SWB model run and opens the Simulation Run Queue dialog.
  • Save, Export, and Launch SWB – Combines several other commands together. First, it saves the project file, then exports files for the model run, and finally launches the SWB model run.
  • Properties – Opens the Properties dialog which displays the simulation properties and allows adding notes.

SWB Output Files

After running the model, SWB will generate several output files.

  • Recharge daily statistics – Contains the minimum, maximum, and mean values for all major components of the water balance for all grid cells in the model on a given day.
  • Recharge daily report – Contains values representing the individual daily values summed over the entire model multiplied by the conversion factor.
  • Recharge annual statistics – Contains mean values representing the annual sum of daily mean values.
  • Log file – Contains a report of the processes performed during the model run.
  • Grid and image files – Based on the selected optional output variables in the model control.

External Links