Investigating the Vulnerability and Site Selection for Urban Storm Water Spreading Based on the Analytical Hierarchy Process (AHP) Method

Nosrat Aghazadeh ¹ ( Department of Civil Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran )
Misagh Goldoost Rezaei ² ( Department of Civil Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran )
Reza Shekari Tappe ³ ( Department of Civil Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran )

Submited date : 2022-12-21 Accepted date : 2024-04-20

Keywords: &quot, , &quot, AHP&quot, Urban Aquifer&quot, Vulnerability&quot, Khoy&quot, , Urban Ecology&quot,

Abstract :

The expansion of urban areas, the existence of various commercial and industrial activities and the change of land use have caused urban aquifers to have a high risk of pollution and the amount of their direct recharge will decrease due to the expansion of impervious surfaces. Therefore, assessing the vulnerability and determining the appropriate place for aquifer recharge can be useful in managing and optimally using these resources. The purpose of this study is to assess the pollution risk and develop the modified Drastic DRAST-LUV model to determine the vulnerability of the Khoy urban aquifer and then to determine the suitable areas for the spread of urban floods in Khoy city using the LANDSET-V model. The results obtained from the modified urban aquifer vulnerability model showed that in 16% of the studied area, the risk of pollution is very low and 68% is low to medium. In the old urban area and in areas with groundwater depth of less than 10 meters, which includes 16% of the total area of the region, the vulnerability index is more than 0.3 and the risk of groundwater pollution in these areas is high. Also, according to the GWQI index, mainly the southern part of the city does not have the quality of groundwater suitable for drinking. The sensitivity evaluation of the vulnerability model show that the vulnerability index changes between 0.15 and 0.352 and the model has the most sensitivity to the parameters of the unsaturated zone (A) and polluting sources (S) and the least sensitivity to the urbanization index (U). The weight of these parameters in the modified model is 0.18, 0.24 and 0.09, respectively. The results of the flood spreading location model show that only 7.8 km2 of the studied area (40% of the total area) can recharge the aquifer through the flood spreading basin. These areas are mainly on the suburban with a slope of less than 5%, transmissivity coefficient of more than 480 m2/d and with agricultural and barren land use.