The Friendly Woolly Mammoth  The Friendly Dinosaur
Groundwater Modeling and Aquifer Analysis 



Our Mall
Free Stuff


Groundwater Flow Modeling

Groundwater flow modeling is generally used to determine the quantity of groundwater available for use or direction and distance of dissolved contaminant migration.    It is also used to define the limits of a capture zone for a recovery well (or well field), or for delineating a wellhead protection area (or recharge area) for a water supply well.   We have usually used analytical means to model these situations using the Theim (1906) equilibrium constant discharge formula to estimate distance-drawdown relationships. In order to estimate the long-term yield and drawdown of a recovery or water supply well (or well field) we usually use the Cooper-Jacob (1946) modified non-equilibrium constant discharge method for making projections.    Because many of the situations encountered in New England involve unconfined (water-table) aquifers, we have used Prickett's type curve solution (1965) for making allowances for unconfined conditions and delayed aquifer drainage.

Solute Transport ModelingGroundwater Modeling:  Typical Modeling Layout

Analytical modeling can be very time-intensive and, therefore expensive.   We have used the U.S. Geological Survey Two-Dimensional Solute Transport (MOC), Version 3.0 (Konikow and Bredehoeft, 1989) to evaluate the transport of certain volatile organic compounds on a number of sites.   It can be obtained from the International Ground Water Modeling Center (IGWMC).    This model has been used to assess the distribution of hydrocarbon concentrations around a active contaminant source to evaluate various remedial scenarios including source control, attenuation resulting from microbial decay, effect of groundwater recovery wells, and recharge sources. The illustration above shows a simple grid layout for solute transport modeling. Such models can be used to predict the time required for remediation or for natural attenuation by existing or enhanced processes in the subsurface.   A number of more recently developed models are available.



Click here for Geologic Resources Home Page Click here for Geologic Resources Resources Page Click here for Geologic Resources Free Stuff Page Click here for Geologic Resources Links Page Click here for Geologic Resources Link Directory Click here for Geologic Resources Submission Page
Click here for Geologic Resources Software Page Click here for Geologic Resources Computer Store Click here for Geologic Resources Books Page Click here for Geologic Resources Auctions Links Page Click here for Google Search Engine Click here for Yahoo Search Engine and Links
1998-, Geologic Resources, All Rights Reserved

Tools Online Tools