Document Type : پژوهشی
Authors
1 Department of Geography Education, Farhangian University, Tehran, Iran
2 Watershed expert, General Directorate of Natural Resources and Watershed of Khorasan Razavi province
Abstract
Among the types of environmental hazards, flood is one of the most destructive natural disasters that causes a lot of damages and injuries. Therefore, it is very important to identify the potential areas of flood risk to reduce the damages caused by it. Using morphometric indices and AHP and ANP methods, this research seeks to identify flood vulnerable areas in the sub-basins of the Kashf Roud watershed. For this purpose, 16 morphometric indices include: basin area, basin perimeter, waterway length, basin length, shape factor, branching ratio, drainage density, roundness ratio, elongation ratio, tissue ratio, waterway frequency, shape index, maintenance index. The watercourse, basin elevation, elevation ratio, and elevation number were extracted from the DEM of the region, and the flood risk of all sub-basins was determined using two methods, AHP and ANP, and classified into five flood classes: very high, high, medium, low, and very low. were classified The comparison results of AHP and ANP methods were evaluated using Spearman's correlation and checking the percentage of changes. Finally, it was found that the ANP method is more effective in preparing the flood map of the basin. According to the results of this method, 24.3% of the basins are in the very high flood class and 25.7% are in the high class, and in total, more than 50% of the basins are in the high and very high flood class.
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