Abstract 3D virtual network was numerically constructed from particles of various sizes and the drainage process was simulated. The resulting moisture retention curves suggested that the sample geometry affects the drainage. This unexpected result was confirmed experimentally for water retention curves of sandy and loamy soil samples differing only in air accessible surface: 19.6 cm2 (open surface) and around 0.8 mm2 (paraffin covered surface with an opening made by injection needle). Experimental water retention curves differed markedly below pF = 2 and less at higher suctions, confirming the theoretically predicted behavior. The experiment did not confirmed a second hypothesis that water retention depends on sample diameter and height. Two open surface sandy soil samples (5 cm/5 cm and the second – 2.6 cm/2.0 cm; diameter/height) had very similar water retention curves. Possibly the specimens had too close diameter/height ratios.

中文翻译：

---

样品几何形状影响保水曲线：模拟和实验证明

摘要 用不同大小的颗粒数值构建了三维虚拟网络，并对排水过程进行了模拟。所得水分保持曲线表明样品几何形状影响排水。沙质和壤质土壤样品的保水曲线仅在空气可及表面不同：19.6 平方厘米（开放表面）和约 0.8 平方毫米（石蜡覆盖的表面，由注射针制成的开口）证实了这一出乎意料的结果。实验保水曲线在 pF = 2 以下显着不同，在较高吸力下更小，证实了理论上预测的行为。该实验没有证实保水性取决于样品直径和高度的第二个假设。两个开放表面沙质土壤样品（5 cm/5 cm 和第二个 – 2.6 cm/2.0 cm；直径/高度）具有非常相似的保水曲线。可能样品的直径/高度比太接近。