Printer Friendly

Say What?

[ILLUSTRATION OMITTED]

Echo dunes \EK-oh DOONS\ n. Steep dunes that form upwind of an object such as a fence or building. In windy, sandy landscapes, echo dunes can block or bury man-made structures. Using a wind tunnel that generates gusts up to 78 miles per hour, researchers in China are trying to better understand how echo dunes accumulate by looking at what happens to moving air when it encounters an immovable object. The team found that when wind wallops a slope of 60 degrees or more, the air bounces back, creating a vortex. This reversal, they report in the Dec. 9 Journal of Geophysical Research, could shape sand into echo dunes and may provide insight into how to protect desert architecture.

COPYRIGHT 2012 Science Service, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2012 Gale, Cengage Learning. All rights reserved.

 Reader Opinion

Title:

Comment:



 

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:SCIENCE NOTEBOOK
Author:Bohac, Allison
Publication:Science News
Article Type:Brief article
Date:Feb 11, 2012
Words:121
Previous Article:Maybe consciousness will figure itself out someday.
Next Article:Science past: from the issue of February 10, 1962.
Topics:

Terms of use | Copyright © 2014 Farlex, Inc. | Feedback | For webmasters