分选系数 Sorting coefficient 指粒度累计曲线上,25%和75%处所对应的颗粒直径的比值,是表示碎屑沉积物分选性的一种参考。 So=P25/P75,当颗粒分选很好时,P25和P75两值很靠近,所以越接近于1,反之,则远大于1.
随着土壤流失程度的增大,流域不同土地利用状况下的A层土壤颗粒粒径分选系数降低。
With the increasing of soil loss, the sorting coefficient for soil particle diameter of a layer decrease in different types of land utilization.
气测渗透率和微裂缝宽度、微观均质系数、相对分选系数和可动流体体积百分数等都有明显的幂律关系。
The effects of porous microstructure features on porosity and permeability, volume percentage of mobile fluid and pressure sensitivity were also analyzed.
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