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(又称河曲河套蜿蜒型河流)是指河流弯曲。曲流多见于下游。河道的外弯水流较快,河岸受侵蚀;内弯则水流较慢,沉积物累积形成新的河岸。河道因此越来越弯,河谷亦越来越宽。当曲流过弯而脱离主河道,该段曲流就会变成牛轭湖。曲流是堆积和侵蚀作用一起发生的。

曲流的生命周期

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