Applying Landslide Hazard Zonation in Forest Road Network Design

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Forest road networks are essential structures to achieve the forestry aims, but these structures include most implemental and environmental costs. To minimize these costs, the effective factors have to be considered in forest road design which landslide susceptibility is one of the major factors. Road construction on susceptible terrain increase road maintenance cost and environmental impacts. Landslide hazard zonation is a method that can be applied to recognize and avoid the unstable terrain. In this research, the landslide hazard zonation map of Baharbon district in Kheyroud Research Forest was developed using a combined model, AHP and Density Area methods. First, Landslides distribution map of study area was prepared in ArcGIS using field observations and then the map of effective factors in landslide occurrence were prepared. To determine the weight of effective factors AHP was used. Afterward a bivariate statistical model, Density Area, was used for calculating the weight of classes of effective factors maps. By combining the effective factors maps and classifying the combined map with regard to breakpoints of frequency curve, the landslide hazard zonation map was developed. According to the results, 14.7%, 26.9%, 38.9%, 15% and 4.5% of the district were classified as very low, low, moderate, high and very high hazard, respectively. Finally due to lack of landslide occurrence in slope class of 0-15%, as well as it is suitable slope for road design, this class was suggested as positive control points. The other slope classes that were in low and ...

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