Zoning of land subsidence risk in the central plain of Alborz province using radar interferometry technique and ARAS multi-criteria analysis algorithm

One of the dangers that has occurred in many areas in recent years is the dangers of subsidence. The central plain of Alborz province has also faced a sharp drop in groundwater levels in recent years, which has caused this area to be at risk of subsidence. The purpose of this study is in the first stage of subsidence assessment using radar interferometry technique in SNAP software environment, using the A1 Sentinel image capability and also in relation to zoning of susceptible areas with ARAS multi-criteria algorithm in software environment. Edrisi was implemented in the period of 2016 and 2021. The results of the present study showed that the amount of zero to 300 mm of subsidence has been created in the study area, with the highest amount of subsidence in the central part (Mehrshahr, Khorramdasht, Mohammadshahr) and then in the south. The west is concentrated in Mahdasht. According to the results of subsidence risk zoning; Criteria of water level decline, land use, slope and geology, with weight coefficients of 0.151, 0.147, 0.43 and 0.136, respectively, are the most important factors involved in creating the risk of subsidence of the study area and respectively 55. 135 and 192.28 square kilometers of the area have a very high risk. In addition, the results of the correlation coefficient between the map extracted from the radar interferometry with the water level drop of the wells is 0.89 and with the subsidence zoning map is 0.98. Finally, it can be said that the most important factor involved in increasing the amount and potential of subsidence of the central plain of Alborz province is the excessive use of groundwater and falling water levels.