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Qualitative and Quantitative Ways of Erosion and Sediment Assessment Using MPSIAC‌ and EPM Models in Vardeh Drainage Basin(North of Karaj)

Document Type : Original Research Paper

Authors

1 M.Sc. Student, Department of Geology, Faculty of Sciences, Islamic Azad University, North Tehran Branch, Tehran, Iran

2 Assistant Professor, Department of Geology, Faculty of Sciences, Imam Khomeini International University of Qazvin, Qazvin, Iran

3 Assistant Professor, Department of Geology, Faculty of Sciences, Islamic Azad University, North Tehran Branch, Tehran, Iran

4 Assistant Professor, Soil Conservation and Watershed Management Research Institute, Tehran, Iran

Abstract

Vardeh drainage basin is located at north of Karaj and belongs to Central Alborz structural zone and its climate is semi-humid. The area of Vardeh basin is 68,97km2. Formations in this basin mainly include shale, tuffaceous shale, tuffaceous sandstone and limestone. The age of Kahar Formation is Precambrian, the oldest formation and quaternary alluvial deposits are the youngest deposits at this basin. The aim of this study is Investigation of susceptibility of formations to erosion with qualitative methods, assessment of physiographic and geomorphology and quantitative ways, MPSIAC model and sedimentary yield. In this   research,­ library­ studies, field surveys, interpreting Arial photos were carried out. The collected data taken into account from geometry factors, in V1 sub – basin minimum slope and altitude and in v7-2 maximum slope and altitude. Vardeh basin is divided into mountain (M,m), hills(h), and alluvial deposit (Qal,Qt).  Mio fancies forms the most area of the basin. In MPSIAC model the effect of nine and EPM model the effect of 4 important factors on soil erosion and sediment yield were evaluated. Numerical values were assigned to them in terms of intensity and weakness of each factor. Using the sum of those values different factors, the amount of sediment yield in basin was calculated as Qs= 0.253e0.036R and finally the map for each of the 9 factors were prepared in Arc GIS environment. According to identifying sub- basins with high sediment yield, V2 and V3 sub- basins deposit and this basin shall be among first priority for soil protection planning.
 

Keywords

References
 
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Scientific Quarterly Journal of Geosciences
Volume 22, Issue 88
December 2013
Pages 145-154
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