Landslide susceptibility assessment in semiarid mountain watershed Using weights-of-evidence and statistical method (Saeedabad-chai Watershd- North of Sahand Mountain)

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Abstract

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 (∑wƒ= + 3.965), landuse(∑wƒ= + 0.759), distance of road(∑wƒ= + 1.498), lithology (∑wƒ= + 0.424), rainfall (∑wƒ= + 0.388), distance of rural (∑wƒ= + 0.161) play a major role in the landslide occurrence.There is a negetive relationship between landslides and distance of fault (∑wƒ= - 0.006) and distance of channel (∑wƒ= - 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.

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