cascading upward through a chain of turbulent feat

cascading upward through a chain of turbulent features 中 upward through 如何翻译?课文为什么会翻译成接踵而来?,这里cascade是做动词翻译成像瀑布一样落下吗?既然是落下,但按照upward through 的字面意思就是向上通过,连起来怎么会翻译成接踵而来呢?