1. Analytic vs. Numeric Models
Groundwater Modeling
Analytic vs. Numeric Models
Neven Kresic
Amec Foster Wheeler

2. Groundwater Modeling - Analytic Models
Simple and easy to use
Quick sensitivity analysis
Both organic and inorganic (e.g., metals) constituents
Simplified assumptions (“sand box”)
Lumped parameters
Screening-level (“conservative”) analysis
No recharge or artificial stresses (e.g., pumping)
No plume (2D or 3D space) modeling
No variably-saturated modeling
Not adequate for active remedial alternatives

3. Groundwater Modeling - Numeric Models
Can be simple and easy to use
Sensitivity analysis of all individual F&T parameters
Various geochemical & degradation processes
Recharge and artificial stresses
Explicit plume modeling (2D or 3D space)
Variably-saturated modeling
Dual domain problems (NAPL dissolution)
Adequate for various remedial alternatives

4. Analytic Models (BIOCHLOR, BIOSCREEN)

5. Analytic Models (BIOCHLOR, BIOSCREEN)

6. Analytic Models (BIOCHLOR, BIOSCREEN)

7. Numeric Models (MODFLOW, MT3DMS, RT3D)
“Complex”
“Intensive data requirements”
Distrusted by some….

8. Numeric Models (MODFLOW, MT3DMS, RT3D)
Some of the payoffs
Nice visuals
Depictions of plume
development in time
with various remedial
alternatives

9. Numeric Models (MODFLOW, MT3DMS, RT3D)
Institutional control ?