بررسی میزان ترسیب و ویژگی‌های دانه‌بندی، شیمیایی و غلظت عناصر ذرات گرد و غبار در مراکز سکونتگاهی سیستان ناشی از تغییر اقلیم

The aim of this research is to investigate the amount of deposition and characteristics of granularity, chemistry and concentration of dust particles in residential centers of Sistan region. For this purpose, at first, the dust phenomenon was detected using MODIS images and software (WRplot view 8). By installing sediment traps, the amount of sediment deposition was measured in selected stations. In order to analyze the particle size of the sediment samples, the laser method was used and the ICP method was used to determine the geochemistry of the sediments. The findings showed that the extent of dust storms in Sistan region is from northwest to southeast of Sistan region. The particle size analysis of the samples showed that the changes of the average particles of the sediment samples in these stations range from 0.3 microns to 125 microns. Also, the results of the geochemical test of the sediments showed that the dust sediments contain significant amounts of molybdenum (Mo), yttrium (Y, uranium (U), cobalt (Co), cerium (Ce), cesium (Cs), lead. (Pb) and neodymium (Nd) and its concentration is different in Nimroz, Zabul and Zahak cities. In general, it can be concluded that the dust storms in the studied area have internal and external origin, which has caused the deposition of an average of 15 tons per hectare of sediment in the residential centers of the region, and the control of the of the sources of these dust centers of this dust requires the adoption of plans.