Landslide risk zoning in Sain Pass (Ardabil-Sarab communication axis)

Landslide is one of the most important dangerous geomorphological processes of a range, it plays a significant role in the evolution of ranges, Sa'in pass, in the Ardabil-Sarab communication axis, has been affected by landslides for a long time due to its special geological, climatic, geomorphological features and human activities. In line with the zoning of landslides Sa'in Pass in the Nair-Sarab communication axis, nine important variables affecting the occurrence of landslides were used, including: height, slope, slope direction, geological formations, distance from the fault, rainfall and distance from the waterway, land use and distance from the communication road. The weighting of the investigated factors was done using the ANP method and in the Super Decision software environment. Finally, the thematic layers affecting the landslide event according to their weight or coefficient (resulting from the ANP model) in the ArcGIS software environment using the weighted combination method, were combined with each other and the final map of landslide hazard zoning was obtained in the Nair-Sarab communication axis. . According to the obtained results, the factors of slope, height, lithology and distance from the fault had the highest weight coefficients with values of 0.209, 0.139, 0.132 and 0.124, respectively. The result of this study indicates the high risk of the studied area in terms of landslide occurrence. High-risk areas are mainly located in 10-40% slope, in areas with 300-450 mm rainfall and in close distances from communication road, river and fault. Also, very resistant, non-resistant and semi-resistant formations and agricultural and pasture uses, slopes with north, west and northwest directions, are more sensitive to the occurrence of landslid.