08-Aeolian ppt - Relevant differences in air versus water...

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Unformatted text preview: Relevant differences in air versus water as the transporting fluid Eolian Landscapes and Deposits 800 water air 55 water air density dynamic viscosity Arrows = mean dune forming wind regimes. Aridity is define as P/ET p where P = precipitation and ET p = ability of solar radiation and vegetation to return moisture to the atmosphere by evaporation and evapotranspiration Correlation between aridity and eolian landforms make eolian deposits attractive candidates for _________ studies. P/ET p <0.03 0.03<P/ET p <0.20 0.20<P/ET p <0.50 0.50<P/ET p <0.75 Good match between present- day distribution of active eolian dune fields and worldwide distribution of deserts Superposition of eolian topography Aeolian Bedforms Lower Plane Bed Granules to pebbles up to 1-2 cm Very slow movement by creep May exist as low amplitude, widely space bedforms Ripples Sand ripples Granule ripples Dunes Large variety Upper Flat Bed Rare, local high velocity zones Wind Ripples...
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08-Aeolian ppt - Relevant differences in air versus water...

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