Document Type : Research Paper

Authors

1 Department of Soil and Water Conservation, Faculty of Science and Engineering, University Ilam, Ilam, Iran

2 PhD Scholar, Department of Geomorphology, Tehran University, Tehran, Iran

Abstract

This study was performed to evaluate the effect of soil physicochemical characteristics on the
gully expansion in the Darrehshahr Township of Ilam Province, Iran. In this regard, 36 gullies
were selected. The soil physicochemical properties and geometry characteristics of gullies
were tested using aerial photography, the digital maps, and field operations. The multiple
regression was used to determine the impact of these factors on each gully geometry
characteristics and to establish relationship between dependent and independent variables.
The results showed that EC, SAR, and Na+ have the highest impact and play the most
important role in the development of gully. Whereas amount of organic matter and total of
Ca+++Mg++ prevent gully development because of their soil adherence and flocculating
nature. Moreover, based on the cross-section development model, the amount of SAR and the
Na+ had the highest impact in the increasing cross section of gully. However, the amount of
gypsum and total of Ca++ and Mg++ play the most important role in control and prevent of the
gully development.

Keywords

Main Subjects

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