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In this example the results of POLLUTE are compared to those obtained by the analytical solution given by TDAST. TDAST is a computer program for 2-D plane dispersion in an infinitely deep porous media, developed by Javandel et al. (1984). An infinitely thick layer is considered, however for comparison purposes the calculations will be restricted to the first 10 m. Below the layer the bottom boundary is assumed to extend to infinity and have the same properties as the layer above.

 

The following parameters are assumed for the example:

 

Property

Symbol

Value

Units

Darcy Velocity

va

1.0

m/a

Diffusion Coefficient

D

0.01

m2/a

Distribution Coefficient

Kd

0

cm3/g

Soil Porosity

n

1

-

Dry Density

 

0

g/cm3

Soil Layer Thickness

H

10

m

Number of Sub-layers

 

20

-

Source Concentration

c0

1

g/L

Times of Interest

 

4

a