GLY 101 1st Edition Lecture 25Outline of Last Lecture I. Distribution of GroundwaterThe Water TableFactors Influencing the Storage and Movement of GroundwaterOutline of Current Lecture II. Wind ErosionIII. Wind DepositsCurrent LectureII. Wind Erosion-one way wind erodes is by deflation.-deflation is the lifting and removal of loose material-deflation is usually unnoticed except in shallow depressions called blowouts-when blowouts are lowered to the water table, damp ground and vegetation prevent further deflation-another form of wind erosion is abrasion-abrasion can create interestingly shaped stones called ventifacts-wind erosion is responsible for the formation of yardangs-a yardang is a streamlined, wind-sculpted landform that is oriented parallel to the prevailing windIII. Wind Deposits-winds commonly deposit sand in mounds or ridges called dunesThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.-types of sand dunes are burchan, transverse, longitudinal, parabolic, and star dunes-solitary sand dunes shaped like crescents and with their tips pointing downward are barchan dunes-these dunes form where supplies of sand are limited and the surface is relatively flat, hard, and lacking vegetation-dunes that form a series of long ridges that are separated by troughs and oriented at right angles are transverse dunes- transverse dunes are in regions where the winds are steady, sand in plentiful, and vegetation is sparse or absent-longitudinal dunes are long ridges of sand that form more or less parallel to the prevailing wind where sand supplies are moderate-parabolic dunes form where vegetation partially covers the sand, they resemble barchan dunes shape, except their tips point into the wind-star dunes are isolated hills of sand that exhibit a complex
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