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AEOLIAN GEOMORPHOLOGY

A. Introduction

Landforms of windblown material

Map: wind erosion vulnerability
Source: USDA-NRCS http://soils.usda.gov/use/worldsoils/mapindex/eroswind.html

Learning Outcomes - You should be able to:


B. Forces

Driving forces

Resisting forces


C. Erosion

Deflation: process of wind removing particles from the surface (entrainment)

TransportationPhoto: Saharan dust storm

D. Deposition

Terminal fall velocity; function of particle size

Graph: terminal fall velocity

Deposits well-sorted


E. Erosional Landforms

Ventifacts: faceted rocks shaped by abrasion

Photo: ventifact

Yardangs: streamlined ridges oriented parallel to wind direction

Photo: yardangs

Stone (Desert) pavements


Depositional Landforms

Ergs (sand seas) Photo: erg

Image source: http://earthobservatory.nasa.gov/IOTD/view.php?id=5230

Sand sheets

Wind ripples

Dunes Diagram: dune geometry


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©Karen A. Lemke: klemke@uwsp.edu
Last revised December 14, 2010