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A digital procedure for ground water recharge and discharge pattern recognition and rate estimation
1Illinois State Water Survey, University of Illinois at Champaign-Urbana, 2204 Griffith Dr., Champaign, IL 61820, USA. yflin@uiuc.edu
Ground Water
|May 30, 2003
Summary
A new digital method efficiently estimates groundwater recharge and discharge rates using readily available data. This approach simplifies groundwater zone delineation and rate estimation, making it accessible for various settings.
Area of Science:
- Hydrogeology
- Environmental Science
- Water Resource Management
Background:
- Accurate estimation of groundwater recharge and discharge is crucial for sustainable water resource management.
- Traditional methods can be time-consuming and data-intensive, limiting their widespread application.
- Developing efficient digital procedures is essential for timely groundwater assessments.
Purpose of the Study:
- To present and demonstrate a digital procedure for estimating groundwater recharge/discharge rates.
- To apply this method in a central Wisconsin setting, utilizing readily available data.
- To delineate approximate recharge/discharge zones and estimate their rates with reduced preparation time.
Main Methods:
- Utilized water table measurements, stream baseflows, system bottom data, and hydraulic conductivity.
- Employed water table surface interpolation using radial basis functions (thin-plate splines).
- Performed recharge/discharge mapping via MODFLOW mass-balance calculations and pattern recognition using a GUI program.
- Applied the parameter estimation program UCODE for calibrating simulated and target heads/flows.
Main Results:
- Successfully applied the digital procedure to the Buena Vista Ground Water Basin in Wisconsin.
- Delineated approximate recharge/discharge zones and estimated their rates.
- Demonstrated the method's reliance on accurate water table interpolation and measurement quality.
Conclusions:
- The digital procedure offers a time-efficient approach to estimating groundwater recharge/discharge rates.
- The method's effectiveness is linked to the quality of input data, particularly water table measurements.
- This technique provides a valuable tool for groundwater zone delineation and rate estimation in hydrogeological studies.
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