Tutorials:13 Sediment

From Gsshawiki

This tutorial is compatible with:

WMS Version 8.2 and later
GSSHA™ Version 4.0 and later

Disclaimer: GSSHA tutorial exercises do not represent real world conditions

This tutorial builds on the the previous tutorial, Tutorial 12: Groundwater.

If you are starting at this tutorial,

In the 2D Grid Module select GSSHA™ | Open Project File.
Browse to the Sediments folder.
Select the EauGalleGSSHASed.prj file and select Open.

This is a GSSHA™ model of the Eau Galle subbasin in Wisconsin. This is a long-term model with groundwater parameters included.

Adding Soil Erosion

In the 2D Grid Module select GSSHA™ | Map Tables...
Click on the Soil Erosion tab.
Click Yes to turn soil erosion ON in the Job Control
In the Using index map combo box, select the Combined index map
Click Generate IDs
Fill in the spreadsheet with values from the following table:

Table 14. Values for Eau Galle Soil Erosion

Description 1	Silt loam	Silt loam	Loam	Loam	Coarse sand	Silt loam	Loam	Coarse sand
Description 2	Land ID #21 Row Crops	Land ID #33 Grass	Land ID #21 Row Crops	Land ID #33 Grass	Land ID #21 Row Crops	Land ID #43 Forest	Land ID #43 Forest	Land ID #33 Grass
Transport coefficient	0.285	0.285	0.285	0.285	0.285	0.285	0.285	0.285
Transport index	1.30	1.30	1.30	1.30	1.30	1.30	1.30	1.30
Crit. transport capacity	0.0002	0.0002	0.0002	0.0002	0.0002	0.0002	0.0002	0.0002
Rain splash coeff	1200.0	1200.0	1200.0	1200.0	1200.0	1200.0	1200.0	1200.0
Runoff detachment coeff	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001
Runoff detachment index	0.4	0.4	0.4	0.4	0.4	0.4	0.4	0.4
Runoff detachment crit. shear	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Erodibility coeff	0.0688	0.0088	0.0068	0.0048	0.0005	0.0088	0.0068	0.0005

Click Done to close the GSSHA™ Map Table Editor

Adding Sediment

In the 2D Grid Module select GSSHA™ | Job Control... Notice that the Soil erosion option is now turned on.
Click the Edit parameter... button next to the soil erosion spreadsheet option
Make sure the Transport capacity is set to Kilinc-Richardson
Click the Add button three times to add three Sediments
Fill in the Sediments spreadsheet with values from the following table:

Table 15. Values for Eau Galle Sediments.

ID#	Description	Sp. Grv.	Pt. Diam	Sorb Affinity	*Base Output Filename (.gflx, .gdep, .lflx, ldep)*
1	Sand	2.65	0.25	0.1	sand
2	Silt	2.65	0.16	0.3	silt
3	Clay	2.65	0.001	0.6	clay

Click OK to close the Overland soil erosion dialog
Click the Edit Parameters... button in the Channel routing computation scheme portion of the Job Control dialog (top right corner).
Make sure the Sediment porosity is set to 0.4, the Water temperature at 20.0 deg C, and the Sand size at 0.25 mm.
Leave all other values at their defaults and click OK to close the GSSHA™ Channel Routing Parameters dialog
Click OK to close the GSSHA™ Job Control dialog

Saving and Running the Model

In the 2D Grid Module select GSSHA™ | Save Project File...
Change the project name to EauGalleGSSHASed1.prj and click Save
In the 2D Grid Module select GSSHA™ | Run GSSHA™...
Toggle on the option to suppress screen printing and click OK
Once the model is done running, make sure Read solution on exit is toggled on and click Close.

Post-Processing

In the Project Explorer, right-click on the Outlet Sedograph, located below the GSSHA™ solution folder (the folder with the letter "S" on it)
Select View Graph...
The plot window should show the sedograph, which should look similar to Figure 39.

Figure 39. Eau Galle Groundwater/Sediment Model Outflow Sedograph.

Close the sedograph plot.

If you wish to view more sediment related output, go into the GSSHA™ Job Control, click on Output Control, and toggle on any datasets you would like GSSHA™ to output. Then save your project and run it again.

This concludes the GSSHA™ Sediment tutorial.