Tutorials:13 Sediment

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,

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

This is a GSSHA™ model of the Eight Mile Run basin in the Eau Galle River watershed in Wisconsin. This is a long-term model with groundwater parameters included.

Adding Soil Erosion

1. In the 2D Grid Module select GSSHA™ | Job Control...
2. Click on the Soil erosion box

Adding Sediment

1. Click the Edit parameter... button next to the soil erosion spreadsheet option
2. Make sure the Transport capacity is set to Kilinc-Richardson
3. Click the Add button three times to add three Sediments
4. 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



5. Click OK to close the Overland soil erosion dialog
6. Click the Edit Parameters... button in the Channel routing computation scheme portion of the Job Control dialog (top right corner).
7. 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.
8. Leave all other values at their defaults and click OK to close the GSSHA™ Channel Routing Parameters dialog
9. Click OK to close the GSSHA™ Job Control dialog

Specifying Soil Erosion Parameters

1. In the 2D Grid Module select GSSHA™ | Map Tables...
2. Click on the Soil Erosion tab.
3. In the Using index map combo box, select the Combined index map
4. Click Generate IDs
5. 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 0.034 0.0048 0.005 0.0088 0.0068 0.0005 Sand 0.2 0.2 0.5 0.5 0.9 0.2 0.5 0.9 Silt 0.7 0.7 0.4 0.4 0.1 0.7 0.4 0.1 Clay 0.1 0.1 0.1 0.1 0.0 0.1 0.1 0.0



6. Click Done to close the GSSHA™ Map Table Editor

Saving and Running the Model

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

Post-Processing

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



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


4. 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.

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