ارزیابی نظریه‌ی عدم تغییرات مکانی ریگ‌زارها با استفاده از سنجش‌ازدور

The aim of this paper is assessing the theory of the erg stabilization in space and area. Accordingly, the study areas concluded all of the Ergs in Iran which have been evaluated using Landsat satellite images and remote sensing techniques. We have compared the area and borders of ergs for duration of 1973 to 2016.the results show that Ergs did not have any significant displacement during the study period. They  are stabilized, with an area of over 35906 square kilometers in 1973 and so they have retained  in their initial dimensions for 2016 (35173.5 km2).based on our analysis,  the formation and transformation of Ergs are  controlled by local winds which they mostly are the prevailing phenomena during the warm seasons . There are no local winds in the winters and ERGS spend a colder, wetter and quiescence duration. However the ergs not only have been stable during the study period but also our results revealed an expansion in salt land and playa surfaces around the ergs from 1973 to 2016. In addition, We found out  no significant changes in the morphology of the edges Ergs. The study of subtraction of  19 large Ergs in Iran specified  that more than 68% of  Ergs spread on wet salt land and dry desert surfaces, 11% on the platform masses  (Rige Lut and Gen), and 21% on other areas such as alluvial  plains. Also results show that for preventing damage to the sand dunes dynamic, it is necessary to control the active Barchan in the transport routes.