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Land degradation is one of the destructive phenomena, which leads to a less risky route selection for building a more stable road. To this end, a risk zoning map is required. The purpose of this research is to zonate the risk of landslide to build a forest road using a hierarchical process analysis process in the GIS environment. In this research, by scrolling 3760 hectares in Kuhmian forestry project in Golestan province, the landing slides were recorded by GPS device and ArcGIS9.3.1 software layers were determined. In order to carry out the research steps, a questionnaire was prepared by the review team with the opinion of experts in the field of study including the main criteria of geology, soil texture, vegetation, topography, road route and waterway. The questionnaires were prepared from experts' opinions to compare two and two factors to examine and determine the impact value of each criterion and index. The average of the acceptable values ​​after the analysis was used in the preparation of a land risk zoning map. Using GIS software and the Earth's altitude digital map, existing land surveying maps and maps of the main criteria and sub-criteria effective in the risk of landslide are prepared and after ranking and weighting the criteria on In accordance with the hierarchical analysis process, integration and zoning were performed. Ultimately, by integrating mapping maps, the main criteria including topography, vegetation, geology, soil, waterways and roads, the final zoning map of landslide hazard in 5 slope classes were obtained. According to the results of the most landslide in the studied area, in terms of area in the 15-15% slope and the lowest slope in the slope, more than 75%, the most slip in the west direction, in terms of rangeland and slopes. The maximum slip in depths of about one meter, in terms of soil permeability, is the highest slip in well-permeable soils. According to geological formations, the maximum slopes in jmz and ql formations are the highest in terms of distance from faults. Slides in the distance of 0 to 200 m from faults, the waterways in the distance of 100 to 0 meters are the most slopes and the road is also recorded as the most slides in the distance of 100 to 0 m from the road. In the final risk categorization study, a landslide hazard risk map in a very high risk class, 41% of the recorded slides in terms of the level of slippage in this class and in a high risk class, is about 39% of the slip surface Were recorded, respectively, respectively, with the maximum and minimum slip in terms of area in the gradient of 15-15% and> 75%, respectively, in directions in the west and south, in terms of depth of soil at depths 100-90 and> 110 cm and in terms of distance from the road at intervals of 10-0 and 300-200 meters. Due to the high risk categories, the accuracy of the zoning map was confirmed and, accordingly, its accuracy was shown by the AHP method in appropriate level densities.
     
Type of Study: Research | Subject: سنجش از دور و سامانه های اطلاعات جغرافيايی
Received: 2017/12/5 | Accepted: 2018/08/7

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