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

这个冰花与碎冰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.

就在那个下的时候，参加了个讲座，是有关冰的，讲到了冰的所有变种：结块的、滑溜的、碎片的、松软的、扁平的、白色的、流动的、漂流的和坚固的。

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.

冰塞洪水，大量冰花与碎冰在盖面冰下集聚，造成上游水位显著壅高的现象。