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1 V r i j e U n i v e r s i t e i t B r u s s e l , B elgium ;

A m u l t i - m e t h o d c h a r a c t e r i z a t i o n o f r i v e r - a q u i f e r i n t e r a c t i o n a t t h e m eter -scale: combin i n g f i e l d m e a s u r e m e n t s, h e a t t r a n s p o r t m o d e l l i n g a n d g r o u n dwater modelling.

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1 V r i j e U n i v e r s i t e i t B r u s s e l , B elgium ;

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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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