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Impact of Heterogeneity on Evaporation from Bare Soils

机译：非均质性对裸土蒸发的影响

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摘要

Heterogeneity in soil hydraulic properties has a significant impact on evaporation, and could be harnessed to reduce water losses and improve soil water conservation. This is illustrated through the consideration of the effect of Darcy scale heterogeneities resulting from horizontal layering. The impact of permeability gradient and thickness of layers has been investigated from evaporation experiments performed from homogeneous as well as horizontally multi-layered soil columns. Two main cases are distinguished depending on the sign of the permeability gradient, the unstable case when the permeability increases with depth and the stable case when, on the contrary, the permeability decreases with depth. The results indicate an interesting competition between stabilizing gravity effects and destabilizing or stabilizing permeability gradient effects and lead to the emergence of the concept of two-scale evaporation process.
机译：土壤水力特性的非均质性对蒸发有重要影响，可以用来减少水的流失和改善土壤的水养护。通过考虑由水平分层产生的达西尺度异质性的影响可以说明这一点。渗透率梯度和层厚度的影响已从均质层和水平多层土柱的蒸发实验中进行了研究。取决于渗透率梯度的符号，区分出两种主要情况：渗透率随深度增加而不稳定的情况和相反，渗透率随深度减小而稳定的情况。结果表明，稳定重力效应与稳定或稳定渗透率梯度效应之间存在有趣的竞争，并导致了两级蒸发过程概念的出现。

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  • 来源
  • 会议地点 Ein Bokek(IL)
  • 作者

    Shmuel Assouline; Kfir Narkis; Stephanie Veran-Tissoires; Manuel Marcoux; Marc Prat;

  • 作者单位

    Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO),Bet Dagan, Israel;

    Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO),Bet Dagan, Israel;

    Institut National Polytechnique de Toulouse (INPT), Institut de Mecanique des Fluides de Toulouse (IMFT), UMR 5502 CNRS-UPS, Toulouse, France;

    Institut National Polytechnique de Toulouse (INPT), Institut de Mecanique des Fluides de Toulouse (IMFT), UMR 5502 CNRS-UPS, Toulouse, France;

    Institut National Polytechnique de Toulouse (INPT), Institut de Mecanique des Fluides de Toulouse (IMFT), UMR 5502 CNRS-UPS, Toulouse, France;

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