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Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation

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Modeling surface water-groundwater interaction with MODFLOW: some considerations.

Philip Brunner¹, Craig T Simmons, Peter G Cook

¹Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia.

|November 7, 2009

Summary

This summary is machine-generated.

This study reveals MODFLOW

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Area of Science:

Hydrology and Hydrogeology
Numerical Modeling of Water Resources

Background:

Accurate simulation of surface water-groundwater interaction is crucial for water resource management.
MODFLOW is a widely used software for groundwater modeling, but its assumptions may affect accuracy.
HydroGeoSphere offers a more physically-based approach, simulating saturated-unsaturated flow and coupled processes.

Purpose of the Study:

To evaluate the accuracy of MODFLOW in simulating surface water-groundwater interactions for losing streams.
To quantify the impact of MODFLOW's discretization and assumptions on simulation results compared to HydroGeoSphere.
To identify conditions under which MODFLOW's simplifications lead to significant errors.

Main Methods:

Comparative analysis of MODFLOW and HydroGeoSphere simulations.
Investigation of different vertical and horizontal discretization schemes in MODFLOW.
Utilizing HydroGeoSphere as a reference code for its comprehensive physical representation.

Main Results:

MODFLOW underestimates infiltration flux due to its inability to simulate negative pressures beneath disconnected streams.
MODFLOW's binary river connection (fully connected or disconnected) does not represent transitional flow regimes.
River discretization errors affect water table position, and coarse vertical aquifer discretization impacts groundwater mound height simulations.

Conclusions:

Simplifying assumptions in MODFLOW, particularly regarding stream-aquifer connectivity and discretization, can lead to significant simulation errors.
The study highlights the importance of considering these limitations and the conditions under which they become critical.
Findings provide guidance for improving the application and interpretation of MODFLOW simulations for surface water-groundwater interaction.