Assessment and probability of landslide hazard and zonation hazard and zonation using probalbilistic theory of Dampster sheffer of Hajilar chai basin of east Azarbaijan

Investigating the factors affecting landslide occurrence, providing vulnerability maps and avoiding areas susceptible to landslide can help to reduce the potential damage and risk management of this phenomenon. Therefore, the purpose of this study is to evaluate and constrain Hajilerchay basin in terms of landslide hazard. In order to investigate and zoning the risk of landslide in this basin, the maps and layers of information are the main factors affecting this phenomenon such as slope, gradient direction, precipitation, lithology, land use, distance from fault, distance from the waterway and altitudes. Geographic Information System (GIS) was developed and then, using satellite images and field operations, landslides were identified in the area. The weight of each factor was calculated using the Dempster-Shepherd theory. Weights are included in the operating maps and for each factor we obtain a weighted map. In the next step, weighted maps combined and finally a landslide hazard zonation map was prepared in five categories with very little or very high risk. The results of this study indicate that about 9.43% of the area of the Hajilerchai basin is very likely to occur, as well as 22.42% of the probability of occurrence, 28.09% of the probability of occurrence, 25.33% of the probability of occurrence, and The probability of occurrence is very low in 14/69%.