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Quantifying potential recharge in mantled sinkholes using ERT.

Benjamin F Schwartz¹, Madeline E Schreiber

¹Department of Geosciences, Virginia Polytechnic and State University, Blacksburg, VA 24060, USA. bs37@txstate.edu

|October 1, 2008

Summary

Potential recharge in soils of mantled sinkholes was quantified using electrical resistivity tomography (ERT). This method revealed that recharge occurs intermittently, with significant infiltration observed across sinkhole areas.

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Area of Science:

Hydrogeology
Geophysics

Background:

Mantled sinkholes are critical components of karst hydrological systems.
Understanding recharge dynamics in these features is essential for water resource management.

Purpose of the Study:

To quantify potential recharge through soils in mantled sinkholes using geophysical methods.
To monitor temporal and spatial variations in soil water content.

Main Methods:

Differential electrical resistivity tomography (ERT) was employed to create time series 2D profiles.
Archie's law was used to convert ERT data into 2D volumetric water content profiles.
Data were combined with meteorological records (precipitation, potential evapotranspiration) for recharge calculations.

Main Results:

Potential recharge occurred only during brief intervals, accounting for 19% to 31% of cumulative precipitation.
Infiltration was observed on both sinkhole flanks and bottoms.
Mantled sinkholes facilitate both rapid (macropore flow) and slow (unsaturated flow) recharge.

Conclusions:

Electrical resistivity tomography provides a valuable field-scale method for quantifying recharge in unsaturated soils.
Mantled sinkholes play a significant role in water storage within karst environments.
The study highlights the complex nature of water movement in these geological formations.