Prioritization of areas for controlling erosion and sediment production due to landslides  using the Analytic Hierarchy Process (AHP) method (Case study: Oghan watershed, Golestan Province)

Mosavi Khosravi, Hadi; Peshgaee, Atefe; Oromiehei, Ali

Prioritization of areas for controlling erosion and sediment production due to landslides using the Analytic Hierarchy Process (AHP) method (Case study: Oghan watershed, Golestan Province)

Document Type : Original Article

Authors

Hadi Mosavi Khosravi ¹

Atefe Peshgaee ²

Ali Oromiehei ³

¹ Graduate master in Engineering Geology, Bu-Ali Sina University

² Graduate master in Engineering Geology, Tarbiat Modares University

³ P{rof. of Engineering geology Tarbiat Modares University

Abstract

Investigating the effective factors in the occurrence of landslides in an area and zoning the risk resulting from them can have a positive impact on the management of damage caused by this phenomenon. In this study, with the aim of prioritizing areas for controlling erosion and sediment production due to landslides, using the Analytic Hierarchy Process (AHP) method, the landslide risk zoning map was prepared in the Oghan watershed. First, the effect of influencing factors on the occurrence of landslides was identified by relating them to the landslide Dispersion layer, and after preparing all the information layers, all these layers were overlapped using Arc GIS software and finally, the landslide risk zoning map was drawn. Also, the extent of different danger zones and the number of landslides occurred in them and on that based, it was found that landslide risk zoning in this Watershed with AHP method has a high accuracy and complies with existing conditions. Topographic profile A-A ′ showed that the areas very high risk, which are mainly related to loess deposits, are located in valleys with an average slope of 6 to 11 degrees and at an altitude of less than 1100 meters.

Keywords

"؛ Erosion"؛ Zoning"؛ Landslide"؛

"؛ AHP Model"؛

"؛ Oghan Watershed"

Subjects