Geoenvironmental seep analysis software


	Key words: geoenvironmental,seep,software,analysis,geoenvironmental,software

Postprocessing

Once the solution is imported into GMS, a variety of options are available for displaying the solution. The total head and pressure head data sets can be contoured. Velocity vectors corresponding to Darcy velocity can be plotted. If the Compute flow lines option was selected, a complete flow net may be plotted by displaying contours of total head (equipotential lines) and turning on the Flow lines option in the SEEP2D Display Options dialog.




	Sample flow net from SEEP2D

SEEP2D Display Options

The display options unique to SEEP2D are controlled through the Display Options command in the SEEP2D menu. This command brings up the SEEP2D portion of the 2D Mesh Display Options dialog. The items in the dialog are as follows:

Head BC, Exit Face BC, Flow rate BC, Flux BC

The Head BC, Exit face BC, Flow rate BC, and Flux BC items can be used to turn on the display of a symbol for each of the boundary condition types. The color and type of symbol can be edited by clicking on the plot to the left of each item.

BC Values

If the BC values option is selected, the numerical value of each boundary condition (head, flux rate, etc.) is displayed next to the boundary condition. The font used to display the values can be editing by clicking on the plot to the left of the item.

Flow Lines

If the Compute flow lines option is selected the SEEP2D Analysis Options dialog prior to saving and running the model, SEEP2D performs the computations in two steps. In the first step, SEEP2D solves for the heads. In the second step, the head solution is used to "reverse" the boundary conditions and a second solution is found. This solution represents "flow potential" values. When the solution is read back into GMS, these flow values can be contoured to generate a plot of flow lines. When superimposed on contours of total head (equipotential lines) a complete flow net can be displayed.

When contouring the flow values, GMS must determine a contour interval that will result in the proper number of flow channels. The number of flow channels is computed by solving for numflow in the following equation:

q = kequiv * (numflow / numequipotential) * deltaH

The kequiv value is solved for using the k values for the base material specified using the button just below the Flow Lines option. The equivalent k is computed as follows:

kequiv = sqrt (k1 * k2)

For problems with several material zones where each material is isotropic, the flow net cells in the base material will appear to be square, while the cells in the other material zones will be stretched. The amount of stretching is a function of the relative difference in k values between the material and the base material.

Title

If the Title option is selected, the problem title specified in the Analysis Options dialog will be displayed at the top of the Graphics Window.

Total flow rate

If the Total flow rate option is selected and if a solution is in memory, the total flow rate through the model will be displayed at the top of the Graphics Window, just below the title.


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	Key words: geoenvironmental,seep,software,analysis,geoenvironmental,software


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