Author(s)

R.Ababou, G.Tregarot & A.Larabi

Abstract

Computer Methods in Water Resources XII 529 Partially Saturated Hydrological Flows : Numerical Experiments and Analyses R.Ababou ^\ G.Tregarot ^, A.Larabi ^ BP76 j Ag&z/, /?6z&6zA Morocco Abstract Hydrological flows occur on the ground as well as below it, under different gui- ses: overland run-off, streamtlow, infiltration, evaporation, unconfmed groundwater flow, perched water tables, ponding, seepage and exfiltration at various hydrological interfaces. This paper focuses on coupled saturated / unsatu- rated flows involving free surfaces (water tables). Our approach is based on a mixed formulation of variably saturated flow and a generalized form of Darcy- Buckingham's flux-gradient law. Several test cases are modeled using a 3D finite volume code (Bigflow): 1) Ponded infiltration in a sandy soil containing a clay lens (perched and inverted water tables); 2) Groundwater recharge/discharge to a stream during/

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