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PEGASE's meeting at DTU Lingby, 24-26 March 2003

Detailed study of representative aquifers and simulations of possible evolution scenarios for pesticides in European groundwaters. Hydrogeological contribution from Martigny site in Switzerland. Hydrodynamic modeling and dataset provided by PEGASE project.

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PEGASE's meeting at DTU Lingby, 24-26 March 2003

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  1. PEGASE’S meeting, DTU Lingby 24-26 March 2003PEGASE – Pesticides in European Groundwaters : detailled study of representative Aquifers and Simulations of possible Evolution scenarios (European project 2000-2003)Martigny Site (Switzerland) : Hydrogeological ContributionMahmoud Bouzelboudjen, Eric Di GioiaUniversity of Neuchâtel, Switzerland In collaboration with Kirsten Meiwirth & Marc Soutter Swiss Federal Institute of Technology and Pascal Ornstein & Jean-Daniel RouillerCentre de Recherche Alpin, Sion, Switzerland Prof. André Mermoud, PEGASE Swiss Team Leader, Swiss Federal Institute of Technology, Lausanne

  2. CONTENTS • Situation and data • Water table behavior • 3D Groundwater modelling with Marthe • Dataset provided

  3. PEGASE Project (Martigny, Switzerland)

  4. Thickness (M) of Upper Silt (Layer 1) and Upper gravel (Layer 2) • 3D Groundwater Model : • Thickness [m] Permeability10-4[m/s] • Upper Silt (86 boreholes) 3.5 0.5 • Upper Gravel (35 boreholes) 8.5 6.5 • Middle Silt (24 boreholes) 6.0 0.6 • Lower Gravel (24 boreholes)8.0 (cst) 7.0

  5. 4.1 Aquifer system structure

  6. Hydraulic Potential (m), High Water, July 1999

  7. Hydraulic Potential (m), Low Water, Mach 1999

  8. FullyD FullyG MAR Rhône river and aquifer relations : examples

  9. Rhône river and aquifer relations Legend : Precipitations (in black) Rhône river (in blue) Piezometers (in red)

  10. Rhône river and aquifer relations Legend : Precipitations (in black) Rhône river (in blue) Piezometers (in red)

  11. Results of piezometric campaigns 1994 -2001

  12. Boundary conditions for 3D groundwater modelling (explanations in) : http://www.brgm.fr/pegase/compte%20rendus/martigny.ppt et ftp://sitelftp.unine.ch/Bouzelboudjen/Pegase_EU_Project_2002/

  13. Martigny 3D Model (with Marthe Code) : Hydraulic Conductivity for upper gravel formation and for Rhône river Cell Size 50mx50m

  14. Bleu : Rhône et Canal du syndicat Rouge : zone d ’étude de l ’infiltration des pesticides Coupe N - S Coupe W - E

  15. Martigny groundwater 3D Model (with Marthe code) : Simulated versus observed hydraulic potential - steady state, july 1999)

  16. Martigny groundwater 3D Model (with Marthe code) : Simulated versus observed hydraulic potential – transient state, 1994-2001)

  17. Martigny groundwater 3D Model (with Marthe code) : Simulated versus observed hydraulic potential – transient state, feb. 2001)

  18. Martigny groundwater 3D Model (with Marthe code) : Particle tracking calculated from hydrodynamic model results (transient state, jul. 2001)

  19. Pegase area (4 km2) : Piezometry and electric conductivity (May and July 2001), source : K. Meiwirth

  20. Pegase area (4 km2) : Electric Conductivity observed (May and July 2001), source : K. Meiwirth

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