After accumulation of frazil ices and crushed ices is formed, it will develop toward upper reach and also process slowly toward lower reach.

这花与碎显著聚积体形成后即可向上游发展，也能向下游缓慢推移。

Later that afternoon I went to another lecture, about ice, in all its varieties: frazil, grease, brash, shuga, pancake, white, drift, rafting and fast.

就在那下午稍候，我参加另外一讲座，是有关，讲所有变种：结块、滑溜、碎片、松软、扁平、白色、流动、漂流和坚固。

Ice jam flood: a lot of frazil ices and crushed ices gather under the covering ice, causing heading up of water level of upper reach.

塞洪水，大量花与碎在盖面下集聚，造成上游水位显著壅高现象。