WMS:GSSHA Precipitation: Difference between revisions

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[[Image:Dialog_GSSHA_Precipitation.png|thumb|280 px|''GSSHA Precipitation'' dialog.]]
{{TOC right}}
Rainfall can be input in one of the following formats: 
The ''GSSHA Precipitation'' dialog can be accessed by selecting ''GSSHA'' | '''Precipitation...''' while in the '''2D Grid''' [[File:2D Grid Icon.svg|14px]] module. All rainfall types in GSSHA must be tied to a specific point in time by specifying the year, month, day, hour, and minute of each rainfall data point.  This dialog allows specifying the type of rainfall and entering the necessary data associated with the rainfall type.


*'''Uniform''' constant rainfall over the entire watershed.
Rainfall can be input in one of the following formats, selected from the drop-down in the ''Rainfall event(s)'' section: 
*'''Single''' temporally varying rain gage.
*'''Uniform'''
*'''Multiple''' temporally varying rain gages.
*'''Gage'''
*'''User defined''' hyetograph.
*'''Hyetograph'''
*'''NEXRAD''' radar data.
*'''Nexrad Radar'''
 
All rainfall types in GSSHA must be tied to a specific point in time by specifying the year, month, day, hour, and minute of each rainfall data point.  The ''GSSHA Precipitation'' dialog in WMS allows specifying the type of rainfall and enter the necessary data associated with the rainfall type.  The ''GSSHA Precipitation'' dialog is accessed from the ''GSSHA'' menu in the 2D grid module.
 
===Uniform Rainfall===


===Uniform===
{{anchor|Uniform Rainfall}}[[File:Dialog GSSHA Precipitation.png|thumb|280 px|''GSSHA Precipitation'' dialog showing the "Uniform" options.]]
The ability to assign uniform rainfall over the entire watershed is maintained largely as a trouble-shooting feature and is mostly used in initial model development.  Real watersheds are modeled with temporally and spatially varying rainfall.  For spatially and temporally constant rainfall, the input parameters are:
The ability to assign uniform rainfall over the entire watershed is maintained largely as a trouble-shooting feature and is mostly used in initial model development.  Real watersheds are modeled with temporally and spatially varying rainfall.  For spatially and temporally constant rainfall, the input parameters are:


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:#Hour  
:#Hour  
:#Minute
:#Minute
 
{{-}}
===Gage Rainfall===
==Gage==
{{anchor|Gage Rainfall}}[[File:Dialog GSSHA Precipitation - gage.png|thumb|280 px|''GSSHA Precipitation'' dialog showing the "Gage" options.]]
Select the ''Gage'' option to specify single or multi-gage rainfall.  Rainfall distributions for all rain gages should already be entered on a [[WMS:Rain Gage|rain gage coverage]] in WMS.  Create a separate rain gage coverage for each precipitation event.  Rain gage files constructed using an editor outside of WMS can be used in two ways:  reference the file in the [[WMS:Save GSSHA Project File|''Manage Files'']] dialog when saving the GSSHA project file or use the '''Import Gage File...''' button to read the file and generate rain gage coverages in WMS.
Select the ''Gage'' option to specify single or multi-gage rainfall.  Rainfall distributions for all rain gages should already be entered on a [[WMS:Rain Gage|rain gage coverage]] in WMS.  Create a separate rain gage coverage for each precipitation event.  Rain gage files constructed using an editor outside of WMS can be used in two ways:  reference the file in the [[WMS:Save GSSHA Project File|''Manage Files'']] dialog when saving the GSSHA project file or use the '''Import Gage File...''' button to read the file and generate rain gage coverages in WMS.


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Select [[WMS:Rain Gage|rain gage coverages]] with multiple gages defined to be used for writing the GAG file required by GSSHA.  Specify whether to use Inverse distance weighting (IDW) or Thiessen polygons for determining the spatial variation in rainfall for each grid cell.
Select [[WMS:Rain Gage|rain gage coverages]] with multiple gages defined to be used for writing the GAG file required by GSSHA.  Specify whether to use Inverse distance weighting (IDW) or Thiessen polygons for determining the spatial variation in rainfall for each grid cell.
 
{{-}}
===Hyetograph===
==Hyetograph==
 
[[File:Dialog GSSHA Precipitation - hyetograph.png|thumb|280 px|''GSSHA Precipitation'' dialog showing the "Hyetograph" options.]]
Select the ''Hyetograph'' option to enter a temporally varying, spatially uniform (single-gage) event without creating a rain gage coverage.  Enter the average total depth (mm) of precipitation across the drainage area and the start date/time.  Click on the '''Define Distribution...''' button to define the temporal distribution.
Select the ''Hyetograph'' option to enter a temporally varying, spatially uniform (single-gage) event without creating a rain gage coverage.  Enter the average total depth (mm) of precipitation across the drainage area and the start date/time.  Click on the '''Define Distribution...''' button to define the temporal distribution.
 
{{-}}
===NEXRAD===
==Nexrad Radar==
 
{{anchor|NEXRAD}}[[File:Dialog GSSHA Precipitation - Nexrad radar.png|thumb|280 px|''GSSHA Precipitation'' dialog showing the "Nexrad Radar" options.]]
Select the ''Nexrad Radar'' option and click on the [[WMS:Radar Rainfall|'''Import Radar Data...''' button]] to process NEXRAD rainfall data for use in GSSHA.  WMS will write the GSSHA rainfall (*.gag) file using the RADAR type.  For RADAR type rainfall inputs, Thiessen polygons should be selected as the interpolation method.
Select the ''Nexrad Radar'' option and click on the [[WMS:Radar Rainfall|'''Import Radar Data...''' button]] to process NEXRAD rainfall data for use in GSSHA.  WMS will write the GSSHA rainfall (*.gag) file using the RADAR type.  For RADAR type rainfall inputs, Thiessen polygons should be selected as the interpolation method.
 
{{-}}
==See Also==
==See Also==
*[[WMS:GSSHA Snowmelt Options]]
*[[WMS:GSSHA Snowmelt Options]]

Revision as of 23:41, 17 May 2019


The GSSHA Precipitation dialog can be accessed by selecting GSSHA | Precipitation... while in the 2D Grid 2D Grid Icon.svg module. All rainfall types in GSSHA must be tied to a specific point in time by specifying the year, month, day, hour, and minute of each rainfall data point. This dialog allows specifying the type of rainfall and entering the necessary data associated with the rainfall type.

Rainfall can be input in one of the following formats, selected from the drop-down in the Rainfall event(s) section:

  • Uniform
  • Gage
  • Hyetograph
  • Nexrad Radar

Uniform

GSSHA Precipitation dialog showing the "Uniform" options.

The ability to assign uniform rainfall over the entire watershed is maintained largely as a trouble-shooting feature and is mostly used in initial model development. Real watersheds are modeled with temporally and spatially varying rainfall. For spatially and temporally constant rainfall, the input parameters are:

  • Rainfall Intensity (mm/hr)
  • Rainfall Duration (minutes)
  • Start Time
  1. Year
  2. Month
  3. Day
  4. Hour
  5. Minute


Gage

GSSHA Precipitation dialog showing the "Gage" options.

Select the Gage option to specify single or multi-gage rainfall. Rainfall distributions for all rain gages should already be entered on a rain gage coverage in WMS. Create a separate rain gage coverage for each precipitation event. Rain gage files constructed using an editor outside of WMS can be used in two ways: reference the file in the Manage Files dialog when saving the GSSHA project file or use the Import Gage File... button to read the file and generate rain gage coverages in WMS.

Temporally Varying, Spatially Uniform (Single Gage) Rainfall

Single-gage rainfall produces a time series of rainfall for the entire watershed. Toggle on the the rain gage coverages (containing a single gage) in the dialog that will be used for writing the GAG file required by GSSHA.

Temporally Varying Multiple-Gage Rainfall

Select rain gage coverages with multiple gages defined to be used for writing the GAG file required by GSSHA. Specify whether to use Inverse distance weighting (IDW) or Thiessen polygons for determining the spatial variation in rainfall for each grid cell.

Hyetograph

GSSHA Precipitation dialog showing the "Hyetograph" options.

Select the Hyetograph option to enter a temporally varying, spatially uniform (single-gage) event without creating a rain gage coverage. Enter the average total depth (mm) of precipitation across the drainage area and the start date/time. Click on the Define Distribution... button to define the temporal distribution.

Nexrad Radar

GSSHA Precipitation dialog showing the "Nexrad Radar" options.

Select the Nexrad Radar option and click on the Import Radar Data... button to process NEXRAD rainfall data for use in GSSHA. WMS will write the GSSHA rainfall (*.gag) file using the RADAR type. For RADAR type rainfall inputs, Thiessen polygons should be selected as the interpolation method.

See Also


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