Assessment of Aydoghmoos watershed flood risk using AHP-TOPSIS model

Unaware of the physiographic, hydrological and dynamical conditions of the rivers has led to the spread of floods, which has caused a lot of financial and financial losses in recent years. The purpose of this study is to identify flood risk areas using the TOPSIS model. The basis of this model is the extraction of positive and negative ideal points and the spacing of each criterion in order to determine the different levels of flood potential and to select the best spatial location in terms of flood risks. Therefore, 9 effective layers of flood occurrence in the Topsis model are prepared in the GIS and using the ARCGIS 10.5 software, and using this model, a final map of flood risk zoning is prepared and classified. The results obtained with field observations were carefully evaluated. The Ayudoghmous watershed as one of the Ghezel Ozen sub-basins with a length of about 80 km contains 170 million cubic meters of annual discharge; for the distribution of flood susceptible zones, the FUUZY OVERLAY toolkit of the software suite of Spatial Analyst Tools ArcGIS is used. The results were prepared in five categories. A high risk area of ​​7.95 and a very high risk zone is 4.88%, with the highest flood at the bottom of the catchment, which is reduced by slopes, geologically, this The basin is considered to be part of the Alborz-Azarbayjan Territory.