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Statements

Subject Item
dbr:Cross-bedding
dbo:wikiPageWikiLink
dbr:Foreset_bed
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dbr:Sedimentary_structures
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dbr:Foreset_bed
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Foreset bed 前积层
rdfs:comment
前积层（foreset bed）是河流三角洲的主要部分之一，为河道尽头所看到的三角洲倾斜部分，因为三角洲沉积物沿扇形三角洲前缘沉积。由于沉积物淤积在斜坡表面上，因此产生的层理不是水平状，而是沿流向更深水域水流的方向倾斜，三角洲的横截面显示了流向静水方向上的交错层理。 当携带沉积物的水流遇到静水区时，就会形成了前积层。水流流至静水区时，流速会放缓到足以使较大泥沙颗粒无法再被携带而沉积下来。淤积的沉积物随时间的推移而逐漸积累形成三角洲 A foreset bed is one of the main parts of a river delta. It is the inclined part of a delta that is found at the end of the stream channel as the delta sediment is deposited along the arcuate delta front. As the sediments are deposited on a sloping surface the resulting bedding is not horizontal, but dips in the direction of current flow toward deeper water. A cross-section of a delta shows the cross bedding in the direction of stream flow into the still water.
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前积层（foreset bed）是河流三角洲的主要部分之一，为河道尽头所看到的三角洲倾斜部分，因为三角洲沉积物沿扇形三角洲前缘沉积。由于沉积物淤积在斜坡表面上，因此产生的层理不是水平状，而是沿流向更深水域水流的方向倾斜，三角洲的横截面显示了流向静水方向上的交错层理。 当携带沉积物的水流遇到静水区时，就会形成了前积层。水流流至静水区时，流速会放缓到足以使较大泥沙颗粒无法再被携带而沉积下来。淤积的沉积物随时间的推移而逐漸积累形成三角洲 A foreset bed is one of the main parts of a river delta. It is the inclined part of a delta that is found at the end of the stream channel as the delta sediment is deposited along the arcuate delta front. As the sediments are deposited on a sloping surface the resulting bedding is not horizontal, but dips in the direction of current flow toward deeper water. A cross-section of a delta shows the cross bedding in the direction of stream flow into the still water. The foreset bed is formed when a stream carrying sediment meets still water. When the stream meets the still water, the velocity of the water is decreased enough so that the larger sediment particles can no longer be carried and are therefore deposited. The deposited sediment builds up over time, and a delta is formed.
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