Sediment%20Transport%20PDF0 - SEDIMENT TRANSPORT 1. When...

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SEDIMENT TRANSPORT 1. When the velocity of a moving fluid reaches a critical velocity, grains of a certain size (grain diameter) begin to move or are entrained. The ways in which grains move are of several types and include: Suspension transport - the smaller grains are lifted up into the flow and kept there by the turbulent nature of the flow; so turbulence prevents the grains from returning to the sediment surface Saltation - Motion consists of a series of hops. Grains rise from the surface but then return. When it hits the surface again, it can bounce or knock other grains into similar motion. Traction transport - the larger grains move by rolling or sliding on the sediment surface depending on the shape of the grains 2. Bedload - includes grains in traction transport and saltation. 3. Suspended load - grains that are more or less in permanent suspension. 4. Beds and bedding planes: Beds or strata - layers of sedimentary rock or sediment that have features that distinguish them from layers above and below Bedding planes or bounding surfaces - surfaces that bound the beds or strata Layers < 1 cm thick are laminae Layers > 1 cm thick are beds (with various objectives to indicate thickness variations)
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5. Beds represent deposition - constant physical, biological, chemical processes. Bedding surface indicates a cessation of deposition, or erosion. An individual bed can be formed almost instantaneously or over longer time
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This note was uploaded on 03/02/2010 for the course GEOL 3430 taught by Professor Kraus during the Spring '10 term at Colorado.

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Sediment%20Transport%20PDF0 - SEDIMENT TRANSPORT 1. When...

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