The Central Asian ergs: A study by remote sensing and geographic information systems

Shimrit Maman, Dan G. Blumberg, Haim Tsoar, Batyr Mamedov, Naomi Porat

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Ergs are large, relatively flat areas of deserts covered by wind-swept sand and with varying degrees of vegetation cover. The ergs of Central Asia extend from Turkmenistan to the Syr-Darya River in Kazakhstan. They are crossed by the Amu-Darya River, to the north and south of which lie Kyzyl-Kum and Kara-Kum, respectively. This research focuses on identifying and mapping the ergs of Central Asia and analyzing the climate factors that set the dunes in motion and that later stabilize them. The vast area encompassed by the Central Asian ergs and their inaccessibility make traditional mapping methods virtually impossible. A variety of spaceborne imagery with varying spectral and spatial resolutions was used. These images provided the basis for mapping sand distribution, dune forms, and vegetation cover. Wilson (1973) defined the Central Asian ergs as active based on precipitation. Our results, in contrast, show that these ergs are mostly stabilized, with the estimated sand mantled area for the Kara-Kum desert ~260,000km2, and for the Kyzyl-Kum it is ~195,500km2. Meteorological analysis of wind and precipitation data indicate a low wind power environment (DP<200) and sufficient rainfall (>100mm) to support vegetation. The age of the sand samples was determined by optically stimulated luminescence (OSL) (~5-7Ka), which provides insight about past climate characteristics. GIS analysis was performed in parallel with field work to obtain validation and verification.

Original languageEnglish
Pages (from-to)353-366
Number of pages14
JournalAeolian Research
Volume3
Issue number3
DOIs
StatePublished - 1 Dec 2011

Keywords

  • Kara-Kum
  • Kyzyl-Kum
  • OSL dating
  • Sand seas

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

Fingerprint

Dive into the research topics of 'The Central Asian ergs: A study by remote sensing and geographic information systems'. Together they form a unique fingerprint.

Cite this