Estimate the frequency of speed and direction of erosive winds and generating dust storms in Yazd province by using Windrose, Stormrose and Sandrose

Document Type : Scientific and Technical Note

Author

Assistant Professor, Faculty of natural resources and desert studies, Yazd University, Iran

Abstract

Wind erosion and the occurrence of dust is one of the most important problems in Yazd province which makes a lot of apparent and hidden damages to the Yazd province. Analysis of erosive winds and estimating the Resultant Drift Direction (RDD) of sand flow is a basic study which can lead to more successful implementation of projects to control wind erosion. In this study, tried by using analysis of wind speed and wind direction and calculation of wind drift potential (DP) by taking advantages of Windrose, Stormrose and Sandrose represented a landscape of wind erosion in Yazd province and according to the results of these analysis the Resultant Drift Direction (RDD) of sand flow and dust estimated. The results showed the most erosive winds in Yazd province occurs in spring and summer and the lowest is in autumn. As well as the results revealed, average percentage of erosive winds which are capable of producing dust are between 6.4% in Yazd city and 23.6% in Herat city and on average about 44 days there is the possibility of dust in Yazd province. Therefore, although the prevalence of erosive winds with speed more than 6 meter per second generally does not exceed 14% but, they have the most important role in the occurrence of wind erosion and dust in Yazd province and mobility large amount of dust generally from the southwest and west to the North East and east.

Keywords

Desert Management
Volume 4, Issue 8 - Serial Number 8
9 Articles
March 2017
Pages 96-106

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History

  • Receive Date: 19 August 2015
  • Revise Date: 06 August 2016
  • Accept Date: 26 November 2016

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