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Impact of Evaporation on Field Capacity during Water Drainage Redistribution in a Soil
  • Ali Aldrees,
  • Amine Hafsi
Ali Aldrees
Prince Sattam bin Abdulaziz University College of Computer Science and Engineering
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Amine Hafsi
John Wood Group Plc
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Abstract

To this day, field capacity (FC) is rarely defined in the context of soil properties, and the use of non-physical simplistic models is the common way to normalize water content at FC. In this study, the problem of water drainage redistribution in a soil water column with and without the presence of Evaporation (EV) was extensively studied. Analytical solutions for Richard’s equation were established for the case of water drainage redistribution through a deeply wetted soil column with and without EV at Field Capacity (FC) conditions while water retention and depth evolution curves were plotted first, using different EV values of 2 mm/day, 5 mm/day and 8 mm/day and second, for different drainage redistribution durations of 1 day, 4 days and 6 days where EV was set to zero for the case with no EV or to a fixed value of 5 mm/day for the case with EV. The results suggest that EV plays a significant role in soil water drainage suggesting that, in the presence of EV, the FC drying front reaches much higher depths in the soil water profile than if EV is turned off. It was also concluded that FC reaches deeper depths faster the stronger EV is acting AT the surface of A soil water column.