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Geog May 20 - beach dunes most familiar mostly arid areas...

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Geography 3B May 20, 2011 Wind, Wave, Glacial Processes DUNE FORMATION wind formation similar to water processes- turbulent flows, entrainment transport deposition, similar mechanisms ex) bed forms in riverbeds and how it changes according to velocity of water and grain size same as sand dunes increased turbulence on windward slope then decrease after crest of dune, deposition on slip face, on leeward slope, angle of repose, slumping, as it occurs after successive layers of dune formation, the dune travels (more sand on slip face, and less sand on windward slope, moving it forward) angle of repose- stability roughly 33 degrees vegetation can determine types of dunes (dome, longitudinal, parabolic) and different wind directions
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Unformatted text preview: beach dunes- most familiar mostly arid areas- sahara, Australia, middle east, great basin, baja dune formation requires parent material, need to have sand in column, if tropical or any vegetation, will stabilize soil and eliminates chance of soil movement rarely ²nd dunes in tropical areas silt soil- deglaciation, after glacial recession, exposed glacial till, takes decades to establish vegetation, and therefore soils are thick and deep and uniform in texture common areas-midwest, ukraine, china, argentina vegetation slows windspeed down, variability in slope shape vegetation allows for restoration of dune, material deposited around entrainment of materials by wind in an environement with scare...
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