Quantitative Modeling of Dunefields High and Space Using Geomorphometric Studies in Central Deserts of Iran

This research was aimed to modeling the height and distance of sand dunes in central deserts of Iran (Kashan Erg and Jen Erg) as well as their classification. Results of identifying sand dunes in the study areas showed that there were considerable variations in formation of sand dunes in central deserts of Iran. Quantitative modeling of height based on DEM (80 × 80m) showed that the average height of sand dunes in Kashen Erg and Jen Erg was 35m and 6.84m, respectively. The reduced height in Jen Reg was due to the 37% frequency of sand dunes area and regardless of these dunes, the average height was calculated to be 8.63 m in Jen Reg, of which 90% was in a height class less than 20 m. On the other hand, the frequency percentage variation of sand dunes height classes is higher in Kashan Erg, so that over 80% of Kashan Erg is in a height class less than 50m, while 87% of Jen Erg is in a height class less than 10m. In Kashan Erg, the height of sand dunes is low and gradually increases in the center of Erg, reaching to the highest height of sand dunes. Quantitative modeling of relations between the height and distance of dunes in Jen Erg indicated that the sand dunes activity was restricted to the upper part of the dunes. In Kashan ERG, the comparison of fixed, linear and compound dunes showed that the fixed dunes would be formed at a closer distance as compared with two other types.