Identification of the Origin and Route of Sand Transfer to the Area of Sand Dunes of Yazd Darvazeh Quran

Investigating and understanding Sand dunes is of great importance in the management of natural resources and the control of risks caused by them. The purpose of this research is to investigate the sand dunes of Darvazeh Quran, in the north of Yazd city, which is of great importance due to its proximity to Yazd city and its use for the development of tourism. In this research, in order to determine the origin of Sand dunes, from the wind data of Yazd synoptic station, during a period of 20 years (2001-2021), topographic maps 1:50000, geological maps 1:100000, TM satellite images of 1993, ETM+ year 2008 and 2017 and field studies have been used for sampling. The research method is also based on the analysis of wind characteristics (direction and speed), the mineralogy of sedimentary grains, and the use of satellite images. The results of the wind survey in the studied area showed that strong winds in the dry seasons along the northwest play an important role in the formation, development, and movement of sand. Mineralogical investigation and XRF analysis indicate that quartz minerals and then carbonates with an average of 45 and 33% are the most abundant among the sediments of the studied area and the classification based on spectral reflection of satellite images of loose sands showed that the band ratios are 4.5, 3.4 and 3.5 in TM images can be used to identify the mentioned minerals. Finally, the results showed that the alluvial and flood plains, along with alluvial deposits located in the northwestern and western part of this reservoir, are the main sources of nutrition for the sandy dunes of Darvazeh Quran.