With the diameter of underset pipe increasing the separation granularity of hydrocyclone decreasing and recovery ratio increasing .

随着 底流管直径的增加，分离粒度减小， 分级 效果 明显下降，回收率会增加。

The formation of sand waves is controlled mainly by underset of tidal current and also related to tectonic uplift .

沙波形成主要受潮流 底流 的 水 动力 作用控制，并与构造抬升有关。

With entrance pressure increase the separation granularity of hydrocyclone decrease the split ratio of underset will increase slowly ;

随着入口压力增大，水力旋流器的分离粒度变 小， 底流的分流比会缓慢增加；