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