Evaporation from bare soil surfaces is a natural flow process of global importance. During drying, significant temporal changes in flow rates occur at the soil surface, accompanied by temporal and spatial variations in the partitioning of liquid and vapor water distributions below it. We present a novel approach to modeling the transient process of evaporation from porous media as a succession of steady-state solutions. The governing mechanisms during this dynamic process are captured by accounting for the hydraulic properties of the drying medium, the characteristic features of the medium that control water flow, the atmospheric forcing, and the partitioning between the liquid and vapor phases of the water within the drying profile. We validate this simplified approach using data from a numerical model and from evaporation experiments in different soil types, under various ambient conditions. Using the model, we demonstrate the effect of soil hydraulic properties on the evaporation process. Furthermore, we use the flexibility of the model for evaluating evaporation under different initial and boundary conditions. The predictive capabilities of the proposed analytical model indicate that it is a reliable tool for representing the evaporation process.

中文翻译：

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将多孔介质的瞬态蒸发建模为连续的稳态步骤

裸露土壤表面的蒸发是具有全球重要性的自然流动过程。在干燥过程中，土壤表面的流速会发生显着的时间变化，同时伴随着土壤表面下液态和气态水分布的时间和空间变化。我们提出了一种新方法，将多孔介质蒸发的瞬态过程建模为一系列稳态解。通过考虑干燥介质的水力特性、控制水流的介质特征、大气强迫以及干燥过程中水的液相和气相之间的分配，可以捕获该动态过程中的控制机制。轮廓。我们使用来自数值模型和不同土壤类型、不同环境条件下的蒸发实验的数据来验证这种简化的方法。使用该模型，我们证明了土壤水力特性对蒸发过程的影响。此外，我们使用模型的灵活性来评估不同初始和边界条件下的蒸发。所提出的分析模型的预测能力表明它是代表蒸发过程的可靠工具。