论文标题
在模型聚集的土壤中，水分retention留的晶粒大小依赖性
Grain-size dependence of water retention in a model aggregated soil
论文作者
论文摘要
我们通过实验研究了由聚合玻璃珠组成的模型土壤中的保留量。模型土壤的特征是两个大小参数：聚集体的大小$ d $和单体颗粒的大小（组成的聚集体）$ d $。在实验中，将水洒在具有开放式顶部表面且可排水筛子的型号的土壤系统上。当洒水的水量超过阈值（可保留极限）时，排出通量与洒水通量平衡。测量了保留水和排水的重量变化，以确认这种平衡（稳定）状态并量化保留的水。我们将保留水的重量定义为$ W_0 $，并检查了$ W_0 $，$ D $和$ D $之间的关系。结果，据透露，$ W_0 $随着$ d $的减少而增加，这仅仅是由于毛细管效应而增加。关于$ d $依赖，事实证明，$ w_0 $成为$ d \ simeq 500 $〜$μ$ m的最大值。 $ d $的值最大化保留水的值取决于由于骨骼结构，毛细管效应和重力而导致的空隙形成。
We experimentally examined the amount of water retention in a model soil composed of aggregated glass beads. The model soil was characterized by two size parameters: size of aggregates $D$ and size of monomer particles (composing aggregates) $d$. In the experiment, water was sprinkled on the model-soil system that has an open top surface and drainable sieve bottom. When the sprinkled water amount exceeded a threshold (retainable limit), draining flux balanced with the sprinkled flux. The weight variations of retained and drained water were measured to confirm this balanced (steady) state and quantify the retained water. We defined the weight of the retained water in this steady state as $W_0$ and examined the relationship among $W_0$, $d$ and $D$. As a result, it was revealed that $W_0$ increases as $d$ decreases simply due to the capillary effects. Regarding $D$ dependence, it turned out that $W_0$ becomes the maximum around $D\simeq 500$~$μ$m. The value of $D$ maximizing water retention is determined by the void formation due to the aggregated structure, capillary effect, and gravity.
