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论述河流阶地的组成和成因。

问答题
2022-03-12 17:55
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正确答案

阶地是河流两岸常见的地貌,是由老的河谷构成的,并具有陡坎。
阶地主要是由于新构造运动引起河流下蚀作用的产物。
它的形成基本上经历两个阶段:
(1)在一个相当稳定的大地构造环境下,河流一侧蚀及堆积作用为主,造成宽广的河床与河漫滩;
(2)地壳上升,使河流下切,把原有的谷底抬高到一般洪水位之上,转变为阶地。


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