Investigation of granulometry of aeolian sediments in relation of sand dune morphology (Case study: Kashan Erg)

Kashan Erg is one of the most important sand dunes complexes in Iran. It is included the most important various type of sand dunes in Iran. This study was performed to compare the granulometry of aeolian sediments in different sand dunes and also from plinth to crest of transverse dunes that located in Kashan Erg’s north. In order to determining different statistical variables، aeolian sediment sampling was conducted in different sand dunes. Then، the sample’s granulometry test was done based on dry sieve analysis. Finally، statistical parameters such as mean diameter، Sorting، Skewness، Kurtosis، d10، and d90 were determined. The results showed that the mean diameter، Sorting، d10 and d90 parameters have significant differences at the 95% significance level between the stabilized sand dunes and active ones. Moreover، it was found that in transverse sand dunes، there are a significant difference at the 95% significance level between mean diameter and d90 parameters in bottom of the stoss side and lee side.