Ayman98

Modeling artificial structure in GSSHA

2 posts in this topic

Hello,

Is there tutorials or tips on installing/creating artificial structure in the GSSHA model such as the following:

- Artificial ponds/pans

- Injection/recharge wells

- Storage dams/ boulder dams

Best regards

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Ayman98,

Thanks for your questions.  For information on injection or recharge wells, I recommend going through the Tutorial titled "Advanced Groundwater Modeling in GSSHA".  The tutorial and the data associated with it can be downloaded under the Distributed Hydrology tab on this page.  There is a section in this tutorial on adding wells to your groundwater model and you would just enter a negative pumping rate instead of a positive pumping rate as described in this section.  Note that this tutorial has at least one prerequisite tutorial that describes how to define a basic groundwater model.

For information about how to define a storage dam, you should go through the tutorial titled "Analyzing the Effects of Land Use Change (Part II)".  This first part of this tutorial describes how to define a "Detention Basin", which is the same as a storage dam with possibly different outlet structures.  You would probably define a rule curve in the detention basin parameters dialog.  Note that this tutorial also has at least one prerequisite tutorial.

Defining an artificial pond probably just takes some experience working with GSSHA.  There are tutorials and help pages explaining some of the concepts, but there's not a single tutorial.  The way I would define an artificial pond is to define depression polygons in a GSSHA coverage where the artificial ponds are located.  There's a program called "cleandam" that you run after defining your GSSHA model that removes low points in your model by changing the elevations at these points.  When you run cleandam, any grid cells inside depression polygons are ignored and the original elevations on these cells are maintained.  So make sure the bottom elevations of the ponds are represented in your grid elevations, define depression polygons in your GSSHA coverage where your ponds are located, and run cleandam as usual and the elevations of your ponds will be maintained after running cleandam.  GSSHA will then just use its normal overland flow and infiltration routines for these ponds when you run the model.  Note that computation of overland flow with large ponds will require a smaller time step for your model.

Hope this helps,

Chris

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