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Assessing the Nonlinearity of Karst Response Function under Variable Boundary Conditions
Léa Duran, Matthieu Fournier1, Nicolas Massei1
1University of Rouen, M2C, UMR 6143, 76821 Mont Saint Aignan, France.
Ground Water
|March 31, 2015
Summary
Understanding karst aquifer response to environmental changes is crucial for water management. This study reveals that rainfall, aquifer levels, and tidal influences significantly impact karst system dynamics and water transfer.
Area of Science:
- Hydrogeology
- Environmental Science
- Water Resource Management
Background:
- Karst aquifers exhibit complex, nonlinear hydraulic and transfer responses.
- High transmissivity and surface connectivity make karst systems sensitive to boundary condition changes.
Purpose of the Study:
- To assess how upstream and downstream parameters influence karst aquifer response.
- To develop a methodology for simulating karst system behavior under varying conditions.
Main Methods:
- Artificial tracer tests conducted under diverse hydrologic conditions.
- Principal Component Analysis and Hierarchical Clustering applied to environmental and response variables.
- Symbolic regression used to establish relationships between parameters and residence time distribution (RTD).
Main Results:
- Karst aquifer response variations are primarily driven by cumulative rainfall, piezometric level, and tidal parameters.
- Downstream hydraulic conditions significantly influence the aquifer's hydraulic and transfer behavior.
- Developed equations accurately simulate aquifer response across various conditions.
Conclusions:
- The established relationships provide a tool for simulating karst aquifer responses.
- Findings support effective water resource management in karst environments.
- The methodology aids in decision-making for karst water systems.
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