Coupling Heat and Moisture Flow for the Computation of Actual Evaporation

M.D. Fredlund, J.M. Zhang, D. Tran, D.G. Fredlund

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Climate Change & GeoHazards

ABSTRACT: Numerous analytical procedures have been proposed for the calculation of Potential Evaporation, PE, from a saturated soil surface with ample free water. However, it is the Actual Evaporation, AE, which is required for the design of near-ground surface structures such as soil cover systems. Actual Evaporation is generally less than Potential Evaporation because the suction in the soil decreases the evaporation rate. Wilson et al. (1994) proposed a coupled heat and moisture flow in order to compute Actual Evaporation, (i.e., Modified Wilson-Penman equation). Later, other procedures were proposed for the calculation of Actual Evaporation. One method is known as the Limiting Function procedure for Actual Evaporation. Another procedure is known as the Experimental Based procedure for Actual Evaporation. Each of the above-and the solutions for several procedures that can be used to calculate Actual Evaporation, AE. SOMMAIRE Plusieurs procédéété proposés évaporation des sols saturés avec une abondante quantité évaporation actuelle qui est requise pour les plans structural à ras de terre éévaporation parce que la perméabilité évaporation. Wilson et al (1994) proposé simultanéévaporation actuelle (i.e., équation modifiée de Wilson-édés incluant la fonction limitimental ont été proposés plus récemment. Chacun des procédés cités peut être résolue simultanément actuelle.

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