Investigation of the Relationship between the Aeolian sediments Granolometery and various heights of ardakan Barkhans

Barkhan is one of the most common forms of sand dunes and the influx of sands in the form of Barkhan hills is considered as one of the most important environmental hazards in most parts of Iran, which will cause a decrease in the quality and quantity of groundwater, reduce soil fertility and increase the susceptibility of lands to erosion and landslides. Therefore, their comprehensive identification is very important. The aim of this study was to investigate the granulometric characteristics of Ardakan Barkhans in different heights. In 2016 the study area was identified using Satellite Images and Google Earth software, then, with a field visit to Ardakan region, sampling was done from 6 Barkhan at two different heights.In the next step in the laboratory, granulometric operations were performed on the samples. Then, by performing independent t-test, the significance of the difference of each variable was investigated. The results showed that the highest frequency of samples in the windward slope is related to sands with a size of 250 to 500 microns by 54.68% and in the leeward slope with a size of 125 to 250 microns by 51.97%. Also, the variables of mean diameter, skewness and sorting in the range of 0-2 meters of windward and leeward wind have a significant difference at the level of 95% and no significant difference was observed between the two slops in the Kurtosis variable. Also, it was found that in the range of 2-4 m of Barkhan hills, there is no significant difference between the variables of sorting and Kurtosis on both slopes of the windward and leeward. In this range, a significant difference was observed between the two variables of mean diameter and skewness at the level of 5%. The results show that the ratio of homogeneity of sand grain dimensions in the windward and leeward is different.