谷坡又称谷壁，是河谷两侧的斜坡。
形成机制是流水溯源侵蚀—岩石块体崩塌—谷坡后退。
The formation mechanism is the flowing water trace to the source erosion-rock collapse-ancient slope withdrawal.
山越来越高，坡越来越大，谷越来越深。
Mountain rising, increasing slope, valley deeper and deeper.
低水位时期坡折带控制了下切谷-低位三角洲沉积体系的发育。
The depositional slope-break belt controls the development of sediment system of eroded valley-low stand delta.
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