Lec17 - University of California, Berkeley Civil...

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University of California, Berkeley Professor Ken Johnson Civil Engineering 70 Engineering Geology Civil Engineering 70 Lecture 17 10/23/07 Deserts o Wind o Desert Pavement o Dunes / Cross Bedding mitigate moving dunes o Playa Lakes o Flash Floods / Debris Flow o Evaporite Rocks o Salty Environment Sand Dunes o Large source of sediments from rivers beds and a lot of wind Wind Belt o Dominate weather patterns o Equator don’t get too much wind as hot air rises Tropical zones wind blows from the east Temperate zones (30 degree) wind blows from the west o Convection of falling cooling air creates winds in the 30 degree zone Where most of the deserts lie o Wind belts create the trade winds Rate of sand movement increases exponentially with wind speed Wind o Sorting Dunes o Tend toward uniform grain size Sand Dunes o Created by currents of air o Creates cross bedding o Sand Dunes move slowly along the direction of wind o Cross bed always point in downwind direction
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This note was uploaded on 04/02/2008 for the course CE 70 taught by Professor Johnson during the Fall '07 term at University of California, Berkeley.

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Lec17 - University of California, Berkeley Civil...

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