Aliakbar Noroozi; Ziaoddin Shoaei
Abstract
Wind erosion is one of the important processes of desertification in arid and semi-arid regions. This process causes destruction in the land, soil and water resources and etc. Dust phenomenon is one of the major consequences of wind erosion in the world and Iran, particularly in the west and south west ...
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Wind erosion is one of the important processes of desertification in arid and semi-arid regions. This process causes destruction in the land, soil and water resources and etc. Dust phenomenon is one of the major consequences of wind erosion in the world and Iran, particularly in the west and south west of the country. Therefore, the present study aimed to identify areas of dust generation potential in the Khozestan, Iran using the combination of statistical methods, remote sensing and modeling. The statistical results showed that the most frequent occurrence of this phenomenon happened between 2008 and 2009. Most dust events happened in the seasonal scale, late spring and early summer and in the monthly scale, happened in May, June and July. Dust detection on satellite images and study their concentration using indicators AOD and BTD represents the greatest concentration of dust in the west and south west regions of the Khuzestan province, since 80 percent of these dust occurred in these zones. Tracking of dust showed that during the warm period, most dust happened from north west-south east and west-east and during the cold period, especially at the end of period, the northern-southern dust affected the province. The assessment of land use change showed the reduction in the irrigated areas, vegetation and arid lands increased in 2015, especially for the half of area of western Khuzestan. These features and physiographic features such as erodible formations, saline soils and marshy, low soil moisture and high changes in land use, indicates the presence of dust prone areas and potential for west and southern province.
Akram Mirzaei; Ziaoddin Shoaei; Nader Jalali; Alireza Eslami
Volume 1, Issue 1 , May 2009, , Pages 53-60
Abstract
In this research, Hydro-physical model was used for estimating of potential sediment yield in sub- basin of Karaj watershed. In this model limited field survey is required and five main factors as vegetation cover, rainfall, erosion ability, topography and area were used. The results of comparison made ...
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In this research, Hydro-physical model was used for estimating of potential sediment yield in sub- basin of Karaj watershed. In this model limited field survey is required and five main factors as vegetation cover, rainfall, erosion ability, topography and area were used. The results of comparison made between the observed sediment yields in the gauged station of Siera with the estimation made by the model were highly correlated. Factor analysis by SPSS software was used for determining the role of those factors on erosion and sediment yield. The results showed those factors covered about 92% of sediment changing in sub-basins.
