Identification and Zoning of Flood-Prone Areas Using AHP - GIS (Case Study: Dayyer County, Bushehr Province)

Flood-prone areas are of great importance in order to control the resulting damages, store runoff and increase underground water reserves. In this regard, it is possible to use advanced spatial methods to identify flood-prone areas and use its results in urban management planning. The purpose of the present study is to identify flood prone areas and flood potential zoning of dayyer County in Bushehr province using hierarchical analysis in GIS environment. For this purpose, based on the most important effective factors in creating floods and their weighting, the Analytical Hierarchy (AHP) method was used. After preparing the weighted maps and analyzing the criteria, by overlapping the layers, a flood zoning map was prepared and presented in dayyer County. Based on the results, the extension of the northern and northeastern elevations to the east of dayyer County and the middle elevations of the city and its center have a high flood potential. The results showed that out of the total area of 2306 square kilometers of the studied area, 204 square kilometers are in the very low vulnerability category (8.8%), 563 square kilometers are in the low vulnerability category (24%), and 694 square kilometers are in the medium vulnerability category (5.5). 30 percent), 583 square kilometers are in the high vulnerability class (25.2 percent) and 262 square kilometers are in the very high vulnerability class (11.5 percent). Considering that more than 50% of the area of the region has a medium to high risk of flood potential and the areas with a very high risk also constitute a significant area of the region, Therefore, it is necessary that flood-prone areas be the focus of urban management planning.