Investigate of Wind Regime and Sand Drift Potential in Order to Identify of Sand Dunes Forms

Document Type : Research

Authors

1 Associate Professor, Faculty of Natural Resources, University of Tehran

2 Assistant Professor, Faculty of Natural Resources, University of Tehran

3 Ph. D., student of desertification, Faculty of Natural Resources, University of Tehran

10.22092/wmej.2016.113426

Abstract

Aeolian sediments are in 6 percent of land and 97 percent of them are in arid land. On average, about 20 percent of the arid regions of the world are covered by these. Prevailing winds can shift sand dunes and affect their accumulation. According to sediments have damage and harmful effects on the living then study of this subject is significant importance. In this research with Fryberger method and used of WR PLOT 7.0 and  MATLAB 2013 software in order to assessment of wind regime as well as used from anemometer data of five station near Kashan ERG. Results indicate that east-west winds are dominant and each station shows a kind of wind regime. The frequency of calm winds increases respectively in station of Jngalbani (32.77), Qom (40.05), Garmsar (44.83), Ardestan (50.15) and Kashan (77.04). After calm winds in the area, the most of class is 11-7 Knot, while the most effective class is 17-11 knots (992.6 Erode Index) for wind erosion in the region. Jangalbani station with 441.81 VU and kashan station with 40.02 VU are the highest and lowest quantity of sand drift potential in the region. Comparative studies on various stations in the world according to sand drift potential in the area indicated that kashan ERG is not hazardous then in general, could say that it located in the low-middle class. And the formed of linear and transverse dunes near Kashan and Jangalbani station following a global trend. Result show taht there is note full compliance beatwen Fryberger method and Sand Rosr Graph 3.0 software.

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History

  • Receive Date: 24 August 2014
  • Revise Date: 15 January 2015
  • Accept Date: 19 February 2015

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