06-Bedform ppt - Cross-Bedding, Bedforms, and Paleocurrents...

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1 Cross-Bedding, Bedforms, and Paleocurrents by David M. Rubin and Carissa L. Carter
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2 Transport of sediment typically results in the spontaneous development of trains of repetitive bed topography. Low Froude-Number Bedforms Simons et al., 1961, USGS Water-Supply Paper 1498-A.
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3 Hierarchy of Bedforms Formed by Flow
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4 Lower Plane Bed: 1.Low transport stages: τ b / τ cr < _5_ 2.also, typically _low_ sediment supply rates 3.Approximately planar surfaces : grain transport a mixture of rolling and saltation . 4.Stratification is a result of grains sorting into patches on the bed of like particle size. These patches are almost immobile. Gravelly streaks : mantling top of sandy bar (some dunes are also present) field of view approximately 15m × 13m.
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5 h or d λ or Average flow depth Definitions: Bedform topography
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6 Jerolmack, D.J., Mohrig, D., and McElroy, B., 2005,
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7 Ripples : Asymmetric bedforms that are built out of grains being transported almost purely as _bedload_ . A commonly cited criterion for
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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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06-Bedform ppt - Cross-Bedding, Bedforms, and Paleocurrents...

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