Riffle-pool sequence
In today's world, Riffle-pool sequence is a very relevant topic that has captured the attention of millions of people around the world. Its impact has been felt in different areas, from politics to technology, culture and society in general. Riffle-pool sequence has generated a passionate debate and has triggered a series of investigations and studies in search of answers and solutions. Since its emergence, Riffle-pool sequence has sparked both interest and controversy, and has challenged the way we perceive and understand the world around us. In this article, we will explore the phenomenon of Riffle-pool sequence in depth, examining its many facets and its potential impact in the future.
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In a flowing stream, a riffle-pool sequence (also known as a pool-riffle sequence) develops as a stream's hydrological flow structure alternates from areas of relatively shallow to deeper water. This sequence is present only in streams carrying gravel or coarser sediments. Riffles are formed in shallow areas by coarser materials, such as gravel deposits, over which water flows. Pools are deeper, calmer areas whose bed load (in general) is made up of finer material such as silt.[1] Streams with only sand or silt laden beds do not develop the feature. The sequence within a stream bed commonly occurs at intervals of from 5 to 7 stream widths. Meandering streams with relatively coarse bed load tend to develop a riffle-pool sequence with pools in the outsides of the bends and riffles in the crossovers between one meander to the next on the opposite margin of the stream. The pools are areas of active erosion and the material eroded tends to be deposited in the riffle areas between them.
References
- ^ Lisle, Thomas (July 1979). "A sorting mechanism for a riffle-pool sequence" (PDF). Geological Society of America Bulletin. 90 (7_Part_II): 1142–1157. Bibcode:1979GSAB...90.1142L. doi:10.1130/gsab-p2-90-1142. Retrieved 2009-02-06.