Présentations Colloques

    Oral Presentation
    6.03
    Session 6.03: Innovative tools to improve understanding of groundwater recharge processes
    Guillon Sophie
    Seasonality of recharge fluxes in southern Quebec from subsurface monitoring- processes controlling recharge in seasonally frozen permeable soils
    In cold environments such as that of Quebec (Canada), groundwater recharge mainly occurs during the spring from snowmelt and as a result of the fall rain. Smaller recharge events also occur during the winter due to snow melting at the soil surface and infiltration into frozen or partly-thawed soil. However, soil water dynamics and water infiltration before the onset of spring snowmelt and even during snowmelt are neither well studied nor constrained. Furthermore, they are not fully considered by the models currently used to estimate groundwater recharge. The objective of this work was to quantify the seasonality of recharge fluxes, as well as the sensitivity of winter and snowmelt recharge to meteorological forcing, and especially to soil freeze thaw events.**Recharge fluxes were monitored at an instrumented site located on sandy deposits on the top of a fluvio-glacial landform (esker) located west of Montreal (Quebec, Canada). Water content and temperature were measured in the first meters of soil and in the snowpack during two hydrological years. One dimensional numerical modelling was used to quantify surface water and energy budgets and recharge fluxes. This quantification of recharge is compared to results obtained from water table fluctuations. The results are used to discuss the influence of changing climate conditions on the intensity and the seasonality of recharge.
    France

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