Document Type : Research Paper
Authors
1 Associate Professor, Faculty of Natural Resources, Tarbiat Modares University, Iran
2 Former MSc Student, Faculty of Natural Resources, Tarbiat Modares, Iran
3 Professor, Faculty of Natural Resources, Tehran University, Iran
Abstract
One of the effective factors in soil erosion is geological formations of the drainage basin from the view points of their erodibility and the amount of runoff and sediment yield. In this investigation a part of Segzi- Kuhpayeh subdrainage, located in Zayandeh-Rood Drainage Basin with 67091.7 ha area was chosen for studying erodibility and sediment yield of Quaternary Formations. For doing this, the map of Quaternary Formations was prepared. Then in each unit a field rainfall simulator was used and runoff and sediment were collected from the plots and erodibility and sediment yield factors were obtained. Soil samples were taken adjacent to each micro plot for laboratory tests and the data were analyzed statistically. The results of regression analyses have shown that erodibility and sediment yield are significantly different in various Quaternary Formations. The most important physical and chemical parameters in sediment yield in different formations are Silt, Sand, very Fine Sand, Wetness, Caco3 and in erodibility of different formations are Silt+ very Fine Sand, Caco3, Silt, Clay, very Fine Sand and EC.
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