09-River Handout ppt - Rivers and River Deposits Other...

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1 Rivers and River Deposits Class reading from Boggs, Principles of Sedimentology and Stratigraphy Chapter 8: p.245 - 258. Other words commonly used to describe rivers and their deposits: (1) fluvial (Latin word for "river") (2) alluvial deposits for river deposits (from Latin "to wash against“)
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2 Rivers are classified based on their map pattern (plan form ) River Properties and Deposits Single channel: straight, sinuous, meandering Multiple active channels: Anastomosing_(channels separated by unvegetated , erodible bars) braided_ (channels separated by vegetated , stable islands)
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3 (Platte River, NE, sandy braided river, aerial view) 100m Toutle River, WA, gravelly braided stream- Individual channels within a braided river are very active, changing form via sediment erosion and deposition between the ____ ___________. 1. Braided Rivers
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4 Safid River delta, Iran Yellow River delta, China 2. Anastomosing rivers: Some inland rivers also display multiple channels: each with relatively stable banks Cooper Creek, Australia Saskatchewan River, Canada Channel banks are typically stabilized by plants .
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550 m Trinity River, TX 5 Radar image of the flood plain between the Rio Japurá and Rio Solimoes (Amazon River basin, 1971). Flow is towards the lower right. Note the surface topography marking the former positions of channels across the flood plain. 3. Meandering Channels: sinuous channels exhibiting systematic lateral movement of channel bends through time
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6 F g = pressure force Helical Circulation Flow and sediment transport in a bend r u F c 2 ρ = Centrifugal acceleration associated with particle following a curved path Acceleration of the fluid toward the outside bend produces a ‘piling up’ of fluid. This produces a _______________ , giving rise to a force toward the inner bank. Setup of helical circulation
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This note was uploaded on 03/07/2011 for the course GEO 416M taught by Professor Staff during the Spring '08 term at University of Texas at Austin.

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09-River Handout ppt - Rivers and River Deposits Other...

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