silt fraction

基本解釋

When the silt mass fraction is below the critical value, sand transport rate increases with silt mass fraction.
在低于此臨界值時，輸沙率隨粉粒的質量分數的增大而增大；
The contents of clay fraction and fine silt fraction decreased along the dolomite profile which developed poorly.
通過分析得出剖面特征為：發(fā)育淺薄的白云巖剖面粘粒組和細粉粒組隨剖面加深而逐漸減少；
And the sand ripples on the surface arise obviously with the increasing silt mass fraction and wind speed, but disappear as silt mass fraction exceeds 15%.
實驗中沙波紋的高度和波長隨風速及粉粒的質量分數的增大而增大，而當粉粒的質量分數超過15%時沙波紋消失。

The cassiterite makes up some fraction of the standard sand and river silt there.
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