silt fraction

基本解释

When the silt mass fraction is below the critical value, sand transport rate increases with silt mass fraction.
在低于此临界值时，输沙率随粉粒的质量分数的增大而增大；
The contents of clay fraction and fine silt fraction decreased along the dolomite profile which developed poorly.
通过分析得出剖面特征为：发育浅薄的白云岩剖面粘粒组和细粉粒组随剖面加深而逐渐减少；
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%.
实验中沙波纹的高度和波长随风速及粉粒的质量分数的增大而增大，而当粉粒的质量分数超过15%时沙波纹消失。

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