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Hôtel Château Laurier

NACREW. Québec 2013. Hôtel Château Laurier. August 25-28, 2013 / 25 au 28 août 2013. Impact of vertical variability of soil hydraulic properties on drainage efficiency in cranberry production Yann Périard, M. Sc . Silvio Gumiere, ing ., Ph . D .

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Hôtel Château Laurier

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  1. NACREW • Québec 2013 • Hôtel Château Laurier • August 25-28, 2013 / 25 au 28 août 2013

  2. Impact of vertical variability of soil hydraulic properties on drainage efficiency in cranberry production Yann Périard, M. Sc. Silvio Gumiere, ing., Ph. D. Alain N. Rousseau, ing., Ph. D. Jean Caron, agr., Ph. D.

  3. Introduction Simulation ofperched water table • Need an optimal water management • Perched water table • Heterogeneity of soil profile • Restrictive hydraulic properties in a layer Pressure head Kummer 2004

  4. Diagnosis of perched water table • Calculated with Tx3 (Hortau) • Measured with Water Level Logger • Soil Water Potential=Water Table Depth ? • Formation of a restrictive layer

  5. Numerical simulation of perched water table • Simulation with finite element model Hydrus2D/3D • Good prediction • Now we can do a numerical study • 40 000 simulations

  6. Methodology(Directional Sensitivity Analysis)

  7. Boundary conditions Atmospheric conditions • 168 hours of simulation • 1D domain with 100 cm • 100 elements (101 nodes) • Conditions • Hydraulic (p1..p625) • (n,α, Ks, θs ) • 2 soil types • Physical • 4 depths • 4 thicknesses • Meteorological • 4 rainfalls • (Mualem (1976) and van Genuchten’s model (1980) Seepage face

  8. Sensitivity analysis scheme Model input file Model HYDRUS 1D Output files Parameter file Numerical traitement SENSAN Results • Configuration • Hydraulic parameters (n, α, Ks, θs ) • Rain Depth Thickness • p1 20 10 5 • p2 40 20 10 • p3 60 40 20 • ..p625 80 60 40

  9. Sensitivity calculations • First-order sensitivity index • Gâteaux directional derivative (Gâteaux, R, (1910)) Gâteaux, R

  10. Results

  11. Matric potential at 48 h after the higher level of water table -30 cm • Conditions • 10 cm of depth • 10 cm of thickness • 40 mm of rain • With n and α high • Drainage norm is not respected Wet Comfort Zone -70 cm matric potential (cm) Dry

  12. Matric potential at 48 h after the higher level of water table • n and α • Control the curve shape • At − 30 cm of matric potential • Drainage rate, 3 orders less in the restrictive soil layer

  13. First-order sensitivity index • (p1..p25) • (n, α, Ks, θs) • n and α • high effect on matric potential at 48 h • Sensitive hydraulic parameters

  14. Conclusions • Perched water table • Diagnosis • Measurement & calculation • Numerical study • Identified conditions causing perched water table • n and α • high effect on drainage efficiency

  15. Thank you!Questions ? Canneberges Bieler Nature Canneberge Transport Gaston Nadeau Salzwedel Cranberry Ferme Onésime Pouliot

  16. Thankyou ! Special thanks to our sponsors Un merci spécial à nos commanditaires

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