Document Type : پژوهشی
Authors
1 professor of Geomorphology, Faculty of Social Sciences, University of Mohaghegh Ardabili, Iran.
2 Professor of Geomorphology, Faculty of Social Sciences, University of Mohaghegh Ardabili. Iran
3 PHD student, Geomorphology, University of Mohaghegh Ardabili, Ardabil, Iran
4 Professor of Climatology, Department of physical Geography, Faculty of Social Sciences, University of Mohaghegh Ardabili
Abstract
Land subsidence refers to the gradual or sudden lowering of the earth's surface as a result of various factors such as tectonic activities, mining, oil and gas fields, and illegal extraction of underground water. In Alborz province, the growing trend of population and migration in recent years has added to the increase in demand and the amount of water withdrawal from the underground water table, so it is subject to subsidence due to the sharp drop in the level of underground water. In this research, subsidence assessment was done using radar interferometric technique, and then, prone areas were zoned with multi-criteria algorithm in the time frame of 2016 and 2023. The results of information extraction with interferometric technique showed that the average amount of subsidence in the urban boundaries of Saujblag, Karaj, Nazarabad, Chaharbagh and Fardis is between 15 and 320 mm. According to observations, the highest amount of subsidence is in the eastern part and then in the southern and southwestern parts. According to the estimated results of subsidence risk zoning; The parameters of water level drop, land use, slope and geology, respectively, with weight coefficients of 0.16127, 0.141875, 0.130145 and 0.128474, are the most important factors in creating the risk of subsidence in the study area, which are 31 and 23%, respectively. From the range, it has a very high and high probability of danger.
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