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River-Aquifer Interaction at Aa River: Multi-Method Characterization and Modeling

This study investigates the influence of riverbed heterogeneity on river-aquifer exchange fluxes at Aa River in Belgium, combining field measurements, heat transport modeling, and groundwater modeling methods. The research characterizes meter-scale spatial variability of riverbed hydraulic conductivity and estimates exchange fluxes using temperature profiles and MODFLOW. Results show spatial variability in riverbed conductivity and the importance of lateral fluxes in total exchange. Contact for questions: Gert.ghysels@vub.be.

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River-Aquifer Interaction at Aa River: Multi-Method Characterization and Modeling

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  1. A multi-method characterization of river-aquiferinteractionat themeter-scale: combiningfieldmeasurements, heat transportmodellingandgroundwater modelling Ghysels G.1, Benoit S.2, Awol H., Tolche AD.3, HermansT.2, Nguyen F.4,5, Anibas C.6 and Huysmans M.1,5 1VrijeUniversiteit Brussel, Belgium; 2GhentUniversity, Belgium; 3Haramaya University, Ethiopia; 4University of Liège, Belgium; 5KU Leuven, Belgium; 6UNSW Sydney, Australia

  2. What is theinfluenceof riverbed heterogeneityOn river-aquifer exchange fluxes? Characterizing River-AquiferInteractionat theAaRiver

  3. outline • Groundwater-surface water interaction at the Aa River, Belgium • Characterization of meter-scalespatialvariabilityof riverbed hydraulic conductivity • Estimating river-aquiferexchangefluxes from vertical riverbed temperatureprofiles basedon the1Dheat transportequation • Estimating river-aquiferexchangefluxes with agroundwaterflow model (MODFLOW) Characterizing River-AquiferInteractionat theAaRiver

  4. Study Area Aa river Characterizing River-AquiferInteractionat theAaRiver

  5. Study Area Aa river Characterizing River-AquiferInteractionat theAaRiver

  6. Study Area Aa river Downstreamsection Upstreamsection Characterizing River-AquiferInteractionat theAaRiver

  7. Study Area Aa river Characterizing River-AquiferInteractionat theAaRiver

  8. Methodology Riverbed hydraulicconductivity (Kh and Kv) Analyzed with Bouwer & Rice (1976) & Hvorslev (1951) Characterizing River-AquiferInteractionat theAaRiver

  9. Results Horizontal riverbed conductivity Downstreamsection Upstreamsection Characterizing River-AquiferInteractionat theAaRiver Ghysels et al. (2018), J. Hydrol.

  10. Results Vertical riverbed conductivity Upstreamsection Characterizing River-AquiferInteractionat theAaRiver Ghysels et al. (2018), J. Hydrol.

  11. Methodology Vertical riverbed temperature profiles Analytical solution of BredehoeftandPapadopulos (1965) for 1D steady-state, vertical, anisothermal heat transport Characterizing River-AquiferInteractionat theAaRiver

  12. Results Estimatedriver-aquiferexchange fluxes Characterizing River-AquiferInteractionat theAaRiver

  13. Methodology Simulating river-aquiferexchange in MODFLOW Characterizing River-AquiferInteractionat theAaRiver Ghysels et al. (2019), Hydrogeol. J.

  14. Results Simulated fluxes in MODFLOW Characterizing River-AquiferInteractionat theAaRiver

  15. Results Simulated fluxes in MODFLOW Characterizing River-AquiferInteractionat theAaRiver

  16. Conclusion • Riverbed K and flux estimates display strong spatialvariabilityat meter-scale • No clear correlation between riverbed K and vertical flux estimates • Riverbeds are complex structures that are characterized by complex flow fields • Lateralfluxes throughtheriverbanksandriverbedarean importantcontributorto totalriver-aquiferexchange fluxes • Assumption of strictly vertical fluxes violated near banks Characterizing River-AquiferInteractionat theAa River

  17. Thankyou! Questions? Contact: Gert.ghysels@vub.be Characterizing River-AquiferInteractionat theAa River

  18. Methodology Geophysical Measurements Characterizing River-AquiferInteractionat theAaRiver Benoit et al. (2018), Hydrogeol. J.

  19. Results Geophysical Measurements as secondaryinformation Characterizing River-AquiferInteractionat theAaRiver Benoit et al. (2018), Hydrogeol. J.

  20. Riverbedsareheterogeneousstructures Riverbed hydraulicconductivity (Kh and Kv)

  21. Riverbedsareheterogeneousstructures Electrical resistivity tomography & Induced polarization

  22. Howcanwe modelheterogeneousriverbedsin mOdflow? Riverpackage

  23. Howcanwe modelheterogeneousriverbedsin mOdflow? Modified approach

  24. What is theeffect of lateral flows through the river banks?

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