landslide susceptibility assessment in semiarid mountain watershed using weights-of-evidence and statistical method (saeedabad-chai watershd- north of sahand mountain)

the aim of this study is assessing and mapping landslide susceptibility in watershed of semiarid mountain areas. saeedabad-chai watershd is located on the northwest of iran and the north of sahand mountain. this study is using bivariate statistical analysis (bsa), weights-of-evidence (woe),gis. the results of this assessment show that causative factors as slope (∑wæ’= + 3.965), landuse(∑wæ’= + 0.759), distance of road(∑wæ’= + 1.498), lithology (∑wæ’= + 0.424), rainfall (∑wæ’= + 0.388), distance of rural (∑wæ’= + 0.161) play a major role in the landslide occurrence.there is a negetive relationship between landslides and distance of fault (∑wæ’= - 0.006) and distance of channel (∑wæ’= - 0.325) in the saeedabad-chai watershd. the medium, high and very high susceptbility zones make up 43.116 % of the total study area. the acuuracy of the map was evaluated by( li) index. this index shows that 92% of landslides occure on medium, high and very high susceptbility zone.