GROUNDWATER MODELING & VISUALIZATION


that are not laterally contiguous and/or gradational. This modeling was constrained above by the ground surface model. The lower portion of the lithologic model was con- strained below by the uppermost unit within the stratig- raphy model.


5. Merging the Lithology and Stratigraphy Models: The overburden lithology model was then combined with the stratigraphy model to produce a geology model (Fig- ure 4D).


6. Fracturing the Geology Model: Downhole fractures (Figure 4D) were then added to the geology model using a distance-to-fracture algorithm. This is accomplished          relative to the disc midpoints and setting the intersected         - 


the limestone because fractures were not observed within the underlying units. Fractures within the epikarst and dolomite were also modeled separately because nearby outcrops indicated that the fracture fabrics within the dolomite and limestone are quite different.


7. Converting the Fractured Geology Model to a Hy- draulic Conductivity (K) Model: The fractured geol- ogy model (Figure 4D) was then converted to a hydraulic conductivity model (Figure 4E) based on an equivalence table of rock conductivities provided by the client.


8. Creating an MHWL Model: A MHWL elevation model - metric surface elevations from the borehole database and approximating the elevations into a grid model using a Kriging algorithm in conjunction with a trend-polynomi- 


Figure 4. Models used to create time series groundwater contamination migration models (A-G) and sample output (H). 10 TPG • Oct.Nov.Dec 2022 www.aipg.org


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