Free Newsletters - Space News - Defense Alert - Environment Report - Energy Monitor
. 24/7 Space News .




CLIMATE SCIENCE
Greater desertification control using sand trap simulations
by Staff Writers
Heidelberg, Germany (SPX) Sep 30, 2013


File image.

In the fight against desertification, so-called straw checkerboard barriers (SCB) play a significant role. SCB consists of half -exposed criss-crossing rows of straws of wheat, rice, reeds, and other plants. The trouble is that our understanding of the laws governing wind-sand movement in SCB and their surrounding area is insufficient.

Now, Ning Huang and colleagues from Lanzhou University in China have performed a numerical simulation of the sand movement inside the SCB, described in a paper just published in EPJ E. China is particularly affected by desertification, which affects 18 percent of its territory.

The results will help us to understand sand fixation mechanisms that are relevant for sandstorm and land-desertification control.

The authors relied on a simulation of large eddies, which are circulations around an obstruction such as the SCB walls, to study the turbulence stress. They also used a discrete particle-tracing method to numerically simulate the wind -sand movement inside the SCB.

Specifically, they described the sand as a gas, using equations to describe their space-averaged hydrodynamics.

They also analysed in detail the movement characteristics of sand particles, the transverse velocities of sand particles and wind-sand flow within the SCB using a model taking into consideration the coupling effects of wind field and sand particles.

Huang and colleagues found that the SCB contributed to a decrease in the sand transport rate in its interior, thus helping the sand fixation. What is more, as the transverse distance increases, the strength of wind-sand flow eddies decreases.

Meanwhile, the sand accumulates near the interior walls of the SCB. Finally, as the number of SCBs increases, the wind is less able to transport sand.

Future studies will be designed to optimise SCB design, based on the authors' theoretical analysis. These findings could also be used to study the evolution to sand dunes.

N. Huang, X. Xia, D. Tong (2013), Numerical Simulation of Wind-sand Movement in Straw Checkerboard Barriers, European Physical Journal E,DOI 10.1140/epje/i2013-13099-6

.


Related Links
Springer
Climate Science News - Modeling, Mitigation Adaptation






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





CLIMATE SCIENCE
'Star Wars' desert set to be overtaken by sand dunes
Tunis, Tunisia (UPI) Jul 20, 2013
Sand dunes in the Tunisian desert are encroaching on the Hollywood set built to film scenes in the "Star Wars" movies, scientists said. The massive wind-blown, crescent-shaped sand dunes, or barchans, move at a rate of about 50 feet per year. The structures built to film the movie have proved useful to scientists studying sand dune movements, since virtually no permanent structur ... read more


CLIMATE SCIENCE
China unveils its first and unnamed moon rover

Mission to moon will boost research and awareness

Mighty Eagle Improves Autonomous Landing Software With Successful Flight

Watch Out for the Harvest Moon

CLIMATE SCIENCE
Water for future Mars astronauts

NASA Mars rover Curiosity finds water in first sample of planet surface

Science Benefits From Diverse Landing Area Of NASA Mars Rover

First scoop of Mars soil contains 2 percent water: study

CLIMATE SCIENCE
Astronauts Practice Launching in NASA's New Orion Spacecraft

"GRAVITY" is Almost Here

International Partnership Releases Space Exploration Benefits Paper

Iran to send second monkey into space

CLIMATE SCIENCE
Chinese VP stresses peaceful use of space

China's space station to open for foreign peers

Last Days for Tiangong

China civilian technology satellites put into use

CLIMATE SCIENCE
Unmanned cargo ship docks with orbiting Space Station

New space crew joins ISS on Olympic torch mission

Station Crew Readies for Cygnus' Sunday Arrival

American, two Russians take shortcut to space

CLIMATE SCIENCE
ILS Proton Successfully Launches ASTRA 2E for SES

APSCC 2013 reaffirms Arianespace's focus on the Asia-Pacific region

Arianespace and Astrium sign deal to begin production of 18 new Ariane 5 vehicles

Problems with Proton booster fixed

CLIMATE SCIENCE
How Engineers Revamped Spitzer to Probe Exoplanets

ESA selects SSTL to design Exoplanet satellite mission

Coldest Brown Dwarfs Blur Lines between Stars and Planets

NASA-funded Program Helps Amateur Astronomers Detect Alien Worlds

CLIMATE SCIENCE
NGC Completes Safety of Flight Testing on Common Infrared Countermeasure System

Green photon beams more agile than optical tweezers

Space oddity: the mystery of 2013 QW1

Domain walls as new information storage medium




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement