Landslide risk assessment and zoning in Bionij watershed, Kermanshah province

Landslides is considered as one of the major natural hazards in mountainous areas. Identifying the effective factors in the occurrence of landslides in a basin and zoning its risk is one of the basic tools to achieve solutions to control this phenomenon and select the most appropriate and practical management option. The present study aimed to evaluate the factors affecting the occurrence of landslides and its zoning using the LIM model. For this purpose, after obtaining the weight of each of the factor maps and the weight column of each unit (including: altitude, slope, slope direction, drainage density, distance from the river, distance from the road, lithological units, distance from the fault, Vegetation, land use, annual rainfall and soil hydrological groups) The final weight and landslide zining map was obtained using a model from the algebraic sum of the 11 factor layers. According to the results, arounf 34 % of the study area located in the range of high to very high risk, around 41 % in the range of low to very low potential risk, and the rest in the range of medium potential of landslide occurrence. The results of the maximum values obtaned for the final weight of different variables indiated that slope, distance from the road, land use, vegetation, height, lithology, distance from the river, rainfall, soil hydrological group, slope direction and the distance from the fault have the most to the least influence on the occurrence of landslides in the studied region, respectively. In general, the research results can provide useful information to planners in various sectors, including agriculture, industry, environment, etc.