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| dct:created |
2018-11-09 20:01:17
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| skos:scopeNote |
alluvial fan:a deposit of alluvium, having the approximate shape of a segment of a circle, laid down by a river at a point where the gradient decreases, as at the base of a range of hills. ——Oxford English Dictionary
@en
山地沟谷出口处的扇形堆积地貌。河流从山地流至山麓出口处，流速迅速减低，所携带的泥沙碎石堆积下来，形成冲积扇。冲积扇地面从扇的顶端向外缘逐渐降低，堆积物也逐渐变细。在太行山的东麓，有多个冲积扇分布。——《汉语大词典》
意指由水道沉淀下来的大量沉积物构成之扇形坡，在该处遗留下窄缩的水道或高地，并形成一个广阔的山谷或平原。——AAT-台湾 @zh |
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冲积扇
@zh
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