Featured Research

from universities, journals, and other organizations

Speediest Sand Dunes Clocked From Space

Date:
January 7, 2009
Source:
American Geophysical Union
Summary:
Monitoring the speeds of migrating dunes and the volumes of sand transported over time is important to understanding how arid landscapes respond to wind-driven changes.

Monitoring the speeds of migrating dunes and the volumes of sand transported over time is important to understanding how arid landscapes respond to wind-driven changes.

Related Articles


Traditionally, scientists have monitored such changes through detailed field surveys or long-term surveillance of stakes planted in dune fields. Vermeesch and Drake have developed a new and more convenient approach to monitoring the speed and sand flux of migrating dunes.

By using pairs of high-resolution optical satellite images taken at differing times, the authors monitored dune migration in the Bodélé depression of northern Chad over time intervals of 1 month to 6.5 years.

The displacement maps generated from each pair of satellite images were then used to automatically distinguish dunes from interdunes. By interpolating a surface between the interdune areas and subtracting it from the surface observed by the satellite images, the authors obtain dune heights and volumes over fine spatial and temporal scales.

From this, pixel-by-pixel estimates of sand flux were generated, allowing the authors to confirm that the Bodélé contains some of the world's fastest moving dunes.


Story Source:

The above story is based on materials provided by American Geophysical Union. Note: Materials may be edited for content and length.


Journal Reference:

  1. Pieter Vermeesch et al. Remotely sensed dune celerity and sand flux measurements of the world's fastest barchans (Bodélé, Chad). Geophysical Research Letters, DOI: 10.1029/2008GL035921

Cite This Page:

American Geophysical Union. "Speediest Sand Dunes Clocked From Space." ScienceDaily. ScienceDaily, 7 January 2009. <www.sciencedaily.com/releases/2009/01/090102101232.htm>.
American Geophysical Union. (2009, January 7). Speediest Sand Dunes Clocked From Space. ScienceDaily. Retrieved November 28, 2014 from www.sciencedaily.com/releases/2009/01/090102101232.htm
American Geophysical Union. "Speediest Sand Dunes Clocked From Space." ScienceDaily. www.sciencedaily.com/releases/2009/01/090102101232.htm (accessed November 28, 2014).

Share This


More From ScienceDaily



More Space & Time News

Friday, November 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Scientists Find Invisible Space Shield Protecting Earth

Scientists Find Invisible Space Shield Protecting Earth

Newsy (Nov. 27, 2014) — An invisible barrier is keeping dangerous super fast electrons from interfering with our atmosphere, but scientists aren't entirely sure how. Video provided by Newsy
Powered by NewsLook.com
NASA's First 3-D Printer In Space Creates Its First Object

NASA's First 3-D Printer In Space Creates Its First Object

Newsy (Nov. 26, 2014) — The International Space Station is now using a proof-of-concept 3D printer to test additive printing in a weightless, isolated environment. Video provided by Newsy
Powered by NewsLook.com
Feast Your Eyes: Lamb Chop Sent Into Space from UK

Feast Your Eyes: Lamb Chop Sent Into Space from UK

Reuters - Light News Video Online (Nov. 25, 2014) — Take a stab at this -- stunt video shows a lamb chop's journey from an east London restaurant over 30 kilometers into space. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Soyuz Spacecraft Docks With International Space Station: NASA

Soyuz Spacecraft Docks With International Space Station: NASA

AFP (Nov. 24, 2014) — A Russian Soyuz spacecraft carrying Italy's first female astronaut safely docks with the International Space Station, according to NASA. Duration: 00:40 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins