deserts and wind action desert regions and wind erosion desert and adjacent region desert region...
TRANSCRIPT
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DESERTS AND WIND ACTION
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DESERTS AND WIND ACTION
• Desert regions and wind erosion
• Desert and adjacent region
• desert
• region which has an arid climate
• steppe
• region adjacent to a desert with semiarid climate
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Desert (arid climate) and steppe (semiarid climate) areas on Earth
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DESERTS AND WIND ACTION• Wind erosion processes
• deflation is the removal of rock waste from the land by the wind
• blowout or deflation hollow is a depression excavated by the wind in materials as sand and silt deposits easily eroded because of a lack of the presence of adequate vegetation which impedes deflation
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Blowout or deflation hollow
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DESERTS AND WIND ACTION
Deflation Hollow---Blowout
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abrasion is the “sandblasting”effect on materials caused by the impact with particles carried by the wind—frosted windows in houses and ventifacts form
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DESERTS AND WIND ACTION
• Wind erosion loads
• suspended load
• suspended wind blown particles
• consists primarily of silt or clay size particles and if highly concentrated can result in dust storms
• deposition of the suspended load can result in large deposits of loess lacking layering or stratification
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DESERTS AND WIND ACTION
Dust Storms
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DESERTS AND WIND ACTION
Loess Deposits
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DESERTS AND WIND ACTION• bed load
• particles bounced along the ground
• usually consists of sand size particles
• accumulation of the bed load forms desert sand dunes which can migrate easily(active dunes)
• Active sand dunes
• Nature of active (unstable) dunes
• dune profile
• consists of a more gentle windward slope and steeper leeward slope or slipface
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Dune profile
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DESERTS AND WIND ACTION• shifting dunes
• shift downwind and can bury roads, airport runways, homes, etc.
• Categories of active dunes
• based on shape of dune in plan view
• barchan
• crescent shaped with convex portion facing the wind direction
• formed with a constant wind direction and limited sand supply
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Barchan dunesDESERTS AND WIND ACTION
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DESERTS AND WIND ACTION• transverse
• elongated perpendicular to direction of wind
• formed with a constant direction of wind and large supply of sand
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DESERTS AND WIND ACTION• longitudinal or seif
• elongated in general direction of wind
• formed with slightly different wind directions and limited sand supply
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DESERTS AND WIND ACTION• star or complex
• formed with variable wind direction
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DESERTS AND WIND ACTION• Desert landscape and evolution
• Alluvial fan
• fan shaped deposit formed at the foot of mountains in the desert valley or basin
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a bajada is an apron of sediment resulting from a coalescence of alluvial fans
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Playa lake and playaa temporary shallow lake formed in the central basin of a desert during a rare abundant rainfall--a playa is the dry flat lake bed that remains
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DESERTS AND WIND ACTION• Inselberg
• an isolated erosional remnant present after long term erosion of mountain areas which are reduced to these bedrock knobs elevated above the surrounding sediment filled basin
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DESERTS AND WIND ACTION• Pediment
• a carved gently sloping erosional surface on the bedrock in a desert mountainous area
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Stages of landscape in mountainous desert regionsDESERTS AND WIND ACTION
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DESERTS AND WIND ACTION
• Inactive or stable dune---mostly non-desert
• Parabolic dune(foredune)
• formed along coastlines of oceans or large lakes
• winds cause blowouts in sand resulting in a crescent shape with the concave side facing the prevailing wind direction
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THAT’S ALL THECYBER GEOLOGY COURSE FOLKS