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Artificial Recharge of Fresh Water in the Belgian Coastal Dunes

This research presents artificial recharge of freshwater in Belgian coastal dunes, highlighting processes, hydrochemistry, and ecological implications. Extraction, infiltration, groundwater flow, and water types are analyzed, emphasizing low-mineralization source water. Various data and modeling methods are employed to demonstrate the positive effects on drawdowns and ecological restoration. Key reactions like carbonate dissolution are identified in the mixing of recharged water with existing dune water.

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Artificial Recharge of Fresh Water in the Belgian Coastal Dunes

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  1. Artificial Recharge of Fresh Water in the Belgian Coastal Dunes Alexander Vandenbohede, Luc Lebbe and Emmanuel Van Houtte Research Unit Groundwater Modelling Ghent University, Belgium Intermunicipal Water Company of the Veurne region (IWVA)

  2. Infiltration of 2.5 million m³/year Extraction of 3.5 million m³/year Very low mineralisation of source water for recharge: 50 mg/l Extraction wells surrounding ponds

  3. Borehole measurements Sedimentological data Head observations Chemical data Tracer test 3D density dependent flow transport modelling  MOCDENS3D – Visual MOCDENS3D Hydrochemistry  Hydrosomes (water bodies)  Important processes

  4. Fresh water heads

  5. Fresh water heads

  6. Fresh water heads

  7. Replacement of dune water with recharged water

  8. Residencetimes of recharged water

  9. Residencetimes of recharged water

  10. Hydrochemistry

  11. Hydrochemistry

  12. Hydrochemistry

  13. Conclusions • More water is extracted – less water dune water is extracted • Positive effects on drawdowns • Natural groundwater flow is partially restored • Ecological implications

  14. Conclusions • Extracted water is mix of artificial recharged water and dune water • Extracted water is mix of water with a large spectrum of residence times (30 days to 5 years)

  15. Conclusions • Source water for artificial recharge is of very low mineralisation 50 mg/l vs 500 mg/l for dune water • Distinct water types: dune water, extracted water, recharge water, recharged water in aquifer • Most important reactions: carbonate dissolution • consumption of oxygen/nitrate • oxidation of sulphide minerals

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