Investigation of Phsico- Chemical and Mineralogical Characteristics and Variations of Airborne Dust Abundance in the Urban Areas of Sistan Plain

Danesh Shahraki, Mahdi (2016) Investigation of Phsico- Chemical and Mineralogical Characteristics and Variations of Airborne Dust Abundance in the Urban Areas of Sistan Plain. Masters thesis, University of Zabol.

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Abstract

Dust storm is the main source of atmospheric mineral particles, which frequently occurs in arid and semi-arid areas and was considered as a serious environmental risk. Hence, this study was done to investigate of physio-chemical and mineralogical characteristics and variations of airborne dust abundance in the urban areas of Sistan plain which is located in the eastern part of Iran and has in most of the time. Dust samples were collected with dry sampler from urban areas in Sistan plain during 120-day winds blown, and also several samples were taken form Hamoun wetlands bed which was affected by erosion dust source identification. The amount of airborne dust in the urban areas, particle size distribution, organic carbon, soil pH, electrical conductivity, calcium carbonate equivalent and mineralogy of samples were measured. Results showed that the highest amount of airborne dust was obtained in the Hirmand city (216.36 g/m2) and the lowest amount in the Nimruz (22.54 g/m2), which seems the distance from Hamoun wetlands and the surface area that affected by wind erosion is effective on the amount of airborne dust. Silt particles were dominant particle size in the airborne dust and wetland sediments that presents the erodibility of these particles. But high percentage of sand particles was observed in airborne dust samples of Zehak city that could be the effect of a lots of sand dune which are located around of Zahak City. Results of physio-chemical characteristics of wetlands and dust samples showed high salinity and alkalinity, low amount of organic carbon and moderate to high amounts of calcium carbonate equivalent. These characteristics reflect the arid climate and weak vegetation cover in the depositional environment. Mineralogical results wetland samples showed dominance of calcite, quartz and feldspars, respectively and in the airborne dust samples dominant minerals were quartz, calcite and feldspars, respectively. The results introduced Hamoun wetlands as the main source of dust in the Sistan region, but in some cases like Zehak city there are other sources in addition to these wetlands.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Dust storms, Drought, Dust loading, 120day winds, Hamoun wetland
Subjects: S Agriculture > S Agriculture (General)
Depositing User: admin admin1 admin2
Date Deposited: 11 Dec 2016 07:41
Last Modified: 11 Dec 2016 07:41
URI: http://eprints.uoz.ac.ir/id/eprint/1115

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