向下侵蚀又称下切河流下切侵蚀下切,是一种河流的侵蚀作用。由于河水受重力作用,产生由高往低的动能,对河床底部进行挖蚀、磨蚀,以增加河道深度。由于河床坡度越大,流速越大,使得向下侵蚀的力道增加,故通常在河的上游进行。常见的地型有河阶V型谷

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