Abstract A theoretical model for the prediction of the soil–water characteristic curve (SWCC) is presented using pore-scale analysis and three-dimensional approximations of pore geometry employing the concept of unit cells. The model considers the effect of particle size and packing porosity on funicular and pendular retention. The unit cell was upscaled to non-uniform soils using the grain-size distribution curve. SWCC experiments on uniform and graded glass beads were carried out to provide verification data. Predictions for the glass beads showed reasonable results for drying SWCCs. The nonionic surfactant Triton X-100 and sodium chloride were utilized to demonstrate the role of the contact angle and surface tension. The modeling of wetting curves using advancing contact angles indicated the need to consider additional hysteresis mechanisms. The hypothesis of independent grain-size fractions often underestimated matric suctions, leading to the proposal of a correction function using the coefficient of uniformity. The proposed approaches were compared to four previously published models, using 58 glass beads and sandy materials. The new models provided superior results for most of the materials studied. The proposed framework offers a general approach that may be modified in the future by including other retention mechanisms and unit cell geometries.

中文翻译：

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使用孔隙尺度分析模拟土壤-水特征曲线的进展

摘要 使用孔隙尺度分析和采用晶胞概念的孔隙几何三维近似值，提出了预测土壤-水特征曲线 (SWCC) 的理论模型。该模型考虑了粒度和填料孔隙率对索状和摆式保留的影响。使用粒度分布曲线将晶胞放大到不均匀的土壤。对均匀和分级玻璃珠进行 SWCC 实验以提供验证数据。对玻璃珠的预测显示了干燥 SWCC 的合理结果。使用非离子表面活性剂 Triton X-100 和氯化钠来证明接触角和表面张力的作用。使用前进接触角的润湿曲线建模表明需要考虑额外的滞后机制。独立粒度分数的假设通常低估了基质吸力，导致提出使用均匀系数的校正函数。所提出的方法与四个先前发布的模型进行了比较，使用了 58 个玻璃珠和沙质材料。新模型为大多数研究的材料提供了卓越的结果。提议的框架提供了一种通用方法，将来可能会通过包括其他保留机制和晶胞几何形状进行修改。新模型为大多数研究的材料提供了卓越的结果。提议的框架提供了一种通用方法，将来可能会通过包括其他保留机制和晶胞几何形状进行修改。新模型为大多数研究的材料提供了卓越的结果。提议的框架提供了一种通用方法，将来可能会通过包括其他保留机制和晶胞几何形状进行修改。