Difference between revisions of "Tarsier Tutorial: Adding GroundWater to Watershed Simulation"
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== Who has taken this tutorial? == | == Who has taken this tutorial? == |
Revision as of 17:18, 9 April 2010
- This tutorial provides instructions on how to how a groundwater component to you Watershed Simulation Model.
Contents
Prerequisites
Tarsier Tutorial: Watershed simulation using the Marmoset Model
- Watershed analysis saved with all data
- Working watershed simulation model in Marmoset
Adding aquifer Information to your Network Data
- Open your Marmoset form with all appropriate data (eg Net Data, Precipitation Series, Model Time, Landscape Parameters...)
- For your convenience you can save your Watershed form in the Watershed Usee control
- Open and save your watershed analysis form with these data: Hydro DEM, Net Ptr, Stream raster and Tarsier Network Data (tne)
- Open Aquifer Tab in Watershed Analysis tool
- Click Calc Floodplain
- Warning: Must have your Net Ptr, HydroDEM, and Stream Raster open in their usee controls.
- This tool creates a raster covering your floodplain according to your set max flood height
- Default max flood height it 1 meter. This should be estimated and changed to suit your watershed.
- Click Calc Floodplain Area
- Warning: Must have your Net Ptr, HydroDEM, and Stream Raster And your floodplain raster open in their usee controls.
- This too breaks up your floodplain and connects a floodplain area with a corresponding node.
- Click Calc Aquifer From Floodplain
- Warning, must have your floodplain raster open, and have calculated floodplain area
- This tool uses a hillslope parameter to estimate triangular aquifer geometry
- The default hillslope is 15 degrees from horizontal, make a good estimation for your watershed.
- Warning, a hillslope less then or equal to zero, or greater or equal to ninety will not work properly.
Including GroundWater processes in you Watershed Model
- Go to "Watershed models" tab
- In the "Watershed model type" group, there is an option to use the groundwater model, when you are ready, check that box to include ground water
- There are a number of ground water parameters grouped at the bottom of the page
- The Percolation parameter is the percentage of surface water that will infiltrate into the shallow subsurface storage
- The Slope Factor gives the steeper channels of the river a smaller tendency to percolate water. Set this to 1 for a homogeneous percolation rate.
- Darcy's K is a coefficient of subsurface lateral flow. A value of zero will result in no lateral subsurface flow. The higher the value the faster water will flow.
- Near Surface Storage Depth is the space available for percolation from the surface water in a given time step.
- Aquifer Porosity is the space available for water in the aquifer. (eg A value of 0.5 means that of the entire aquifer, 50% is occupied by material and the rest is available for water)
- Max ET is the maximum amount of subsurface evapotranspiration that will occur. Right now this value of ET is set for the Surface.
- ET Extinction Depth is how far down evapotranspiration will take place under the surface. The ET in between the surface and the extinction depth banishes linearly with depth.
- The Aq Perc Rate is the rate at which water will leave the shallow storage and enter the aquifer, this is confusingly percent per time step. Also, 0.5 = %50 etc...
Rough parameters
- Percolation Parameter = 0.6
- Slope Factor = 1
- Darcy k = 2
- Near Surface Storage Depth = 10
- Aquifer Porosity = 0.35
- Max ET = 0.02
- Max flood height = 1
- hillslope parameter = 20
==
- In Progress....