Investigation and zoning of geo-environmental risk around the western edge of Khareshk village's oil transmission line, Iran

In this study, for the first time in Iran and especially in the northern regions of the country, risk assessment was performed in oil transmission lines. For this purpose, a combined approach based on the analytical hierarchy process (AHP) and fuzzy methods were used. Based on this and in the first stage, eight main criteria of distance from the oil transmission line, distance from faults, distance from springs, slope percentage, aspect, geo units, distance from landslide and creep, and stream density were identified. In the second stage, using the AHP method, the research problem became hierarchical. In the third stage, by performing pairwise comparisons between the categories of the main criteria, weights and incompatibility coefficients were obtained for each pair of comparisons. Finally, for the weighted maps' overlay, a fuzzy overlay function in the ArcGIS software was used. According to the final map, 9.39% of the area is in the very high risk category and 21.95% in the high category. Accordingly, the southern areas of the study area have the highest risk levels, and the southern and eastern areas of the mine located in the study area need more attention and review of the method of extraction from the mine.

Automated summary

For the first time in Iran, risk assessment of oil transmission lines was conducted in the northern regions using a combined approach of Analytical Hierarchy Process (AHP) and fuzzy methods. Eight main criteria were identified and hierarchical analysis was performed using the AHP method. Weighted maps were overlaid using a fuzzy overlay function in ArcGIS software to determine high risk areas. The study found that the southern areas have the highest risk levels, requiring more attention and review of extraction methods.