Volume No. 4 Issue No.: 2 Page No.: 334-340 Oct.-Dec 2009




Nayere Ghazanfarpour*1, Hamid Reza Morady2 and Sadat Feiznia3

1. Young researchers club member of Islamic Azad University, Mobarakeh Branch (IRAN)
2. Department of Watershed Management Engineering, Tarbiat Modares University, (IRAN)
3. Department of Arid and Mountainous Regions Reclamation, Faculty of Natural Resources, University of Tehran (IRAN)


Received on : June 04, 2009




Soil erosion has been considered as an environmental concern that can lead to a decline in the quality of life. One of the effective factors in soil erosion is geological formations of the drainage basin from the view point of amount of runoff and sediment yield. Quaternary Formations are one of the widespread geological materials on the earth surface. Due to the fact that many human activities such as development of natural resources and agriculture occur on Quaternary Formations, the investigation of these formations is very essential. This research studies sediment yield on Quaternary formations consisting of alluvial terraces and the relationship between some physical and chemical factors with sediment yield. Therefore a part of Segzi- Kouhpayeh subdrainage located in Zayandeh-Roud Drainage Basin was chosen. A field rainfall simulator was used and runoff and sediment were collected from the plots and sediment yield factor was obtained. Soil samples were taken adjacent to each microplot for laboratory analyses and the data were analyzed statistically. The obtained regression models show that among the measured factors related to the sediment yield of alluvial terraces, the amount of sand and relative wetness have had important and significant roles.


Keywords : Alluvial terraces, Sediment yield, Physicochemical characteristics, Rainfall simulator, Iran