冲积扇平原是由河流沉积作用形成的平原地貌。当山地河流流出山口进入平原后，由于河床坡度骤减，流速降低，水流搬运能力减弱，从而把挟带的碎屑物质堆积下来，形成顶端狭外缘宽的扇形冲积平原。
党河冲积扇带和疏勒河冲积平原，构成了敦煌这片内陆平原。
With the party and the Shule River alluvial fan alluvial plain, this constitutes a land-locked plains Dunhuang.
黑石渡组属于向上变细层序，早期为冲积扇沉积，中期为洪泛平原、决口扇和扇三角洲沉积，晚期为深湖浊流沉积。
HsdF developed the fining upward sequences, and alluvial fan in the early stage, floodplain and crevasse splay and fan delta in the middle stage, and lacustrine turbidites in the late stage.
古人类活动遗址所处地貌部位为古永定河冲积扇的河间冲积平原。
The landform on which ancient human activity relic located was interfluvial floodplain on Yongding River Alluvial Fan.
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