Analysis of landslides occurred in connection with environmental factors (Case study: Sanandaj County)

Landslides are one of the environmental hazards that are always associated with a lot of damage. Landslides are a common danger in mountainous areas that have a high potential in the western regions of Iran, including the Sanandaj County. Due to the importance of the issue, in this study, the effective factors in the occurrence of landslides in Sanandaj County have been analyzed. In this study, in order to achieve the desired goals, a 30 m high digital model of landslides occurred in the region (prepared by the Rangeland and Watershed Management Organization of Kurdistan Province), 1: 100000 geological map and 1: 5000 topographic map of the region Has been. The most important tool used in the research was ArcGIS and also in this research the combined model of fuzzy logic and AHP was used. This research has been done in two stages in the first stage, in the first stage of landslide analysis in relation to various environmental factors and in the second stage, areas prone to landslides have been identified. Based on the results, a large part of the landslides occurred in the direction of the northern slope (51 landslides), slope floors between 40 to 60% (51 landslides), altitudes 1500 to 2010 meters (112 landslides), nearby areas Fault lines, rivers and roads, conglomerate floors, sandstones and shales (78 landslides) as well as classes related to combined cover of pastures and agriculture and poor pastures (respectively, 64 and 36 landslides) occurred. Also, the results indicate that the southern, southwestern and southeastern regions of Sanandaj County have a high potential for landslides due to high altitude and slope, type of lithology and use, as well as northern slope directions.