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Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses

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Published on: October 21, 2016

Modeled ground water age distributions.

Linda R Woolfenden¹, Timothy R Ginn

¹U.S. Geological Survey, 6000 J St., Placer Hall, Sacramento, CA 95819-6129, USA. lrwoolfe@usgs.gov

|February 28, 2009

Summary

This study introduces a new model for groundwater age, providing continuous age distributions instead of discrete measurements. This method enhances understanding of groundwater provenance and aquifer contributions.

Area of Science:

Hydrogeology
Environmental Science
Numerical Modeling

Background:

Groundwater age is a distributed quantity reflecting complex provenance.
Conventional tracer analysis provides limited, discrete age data.
Modeled groundwater age distributions offer continuous insights into aquifer recharge.

Purpose of the Study:

To numerically solve the groundwater age equation (Ginn, 1999).
To generate continuous groundwater age distributions.
To validate the model in both hypothetical and real-world scenarios.

Main Methods:

Numerical solution of the groundwater age equation.
Simulations on a 1D hypothetical flow system.
Application to real-world hydrogeological conditions.

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Main Results:

First continuous groundwater age distributions obtained using the Ginn (1999) model.
Mean ages consistent with expected values in hypothetical scenarios, with minor deviations at high dispersivity.
Stable, mass-balanced simulations under real-world conditions, showing decreasing mean age with increasing dispersivity.

Conclusions:

The numerical solution provides continuous groundwater age distributions.
The model accurately estimates water mass density distributions over age.
This approach offers a more comprehensive understanding of groundwater systems.