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Volume 40, Issue 3 (2025)
GeoRes 2025, 40(3): 1001-1012 |
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Received: 2025/09/22 | Accepted: 2025/10/19 | Published: 2025/09/1
Received: 2025/09/22 | Accepted: 2025/10/19 | Published: 2025/09/1
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Soltani Samet M M, soltani H, Galoie M. Land Subsidence due to Groundwater Depletion using INSAR Method (Case study: Qazvin plain-Buein Zahra region). GeoRes 2025; 40 (3) :1001-1012
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Abstract (185 Views)
Aims & Backgrounds: Land subsidence is a destructive natural hazard that can occur either suddenly or gradually and can lead to severe economic and human losses.
Methodology: In this study, the Qazvin plain (Buein Zahra region) was selected to estimate the subsidence rate. INSAR method and data series from 2019 to 2025 were used to estimate this component. To study this phenomenon, groundwater depletion interpolation maps, active faults and land use data of the area were extracted and analyzed.
Findings: The results of the satellite images show that the average annual drawdown in the study area is 200 mm and that the groundwater depletion rate, which is being observed by the water company of Qazvin is strongly decreasing during 2019 - 2025. The subsidence variations are related to groundwater depletion and land use, as the northern part of the region is predominantly used for agriculture and intensive agricultural activities have led to overexploitation of the aquifers, so that the subsidence rate is higher, while it is quite low in the southern part, which is used for residential purposes.
Conclusion: The results show that the northern, western and central parts of the study area are affected by a high subsidence rate, so that the estimated subsidence rate in the north-western part of the study area is 40% higher compared to the central part and the subsidence rate in the central part is 30 % higher than in the southern part. In addition, groundwater abstraction between 2019 and 2025 is estimated at 10.65 m in the western part, which is 77.5 % higher than in the central part (6 m). The correspondence between the groundwater depletion and the estimated subsidence rate indicates the impact of groundwater overexploitation on the occurrence of subsidence in recent years.
Methodology: In this study, the Qazvin plain (Buein Zahra region) was selected to estimate the subsidence rate. INSAR method and data series from 2019 to 2025 were used to estimate this component. To study this phenomenon, groundwater depletion interpolation maps, active faults and land use data of the area were extracted and analyzed.
Findings: The results of the satellite images show that the average annual drawdown in the study area is 200 mm and that the groundwater depletion rate, which is being observed by the water company of Qazvin is strongly decreasing during 2019 - 2025. The subsidence variations are related to groundwater depletion and land use, as the northern part of the region is predominantly used for agriculture and intensive agricultural activities have led to overexploitation of the aquifers, so that the subsidence rate is higher, while it is quite low in the southern part, which is used for residential purposes.
Conclusion: The results show that the northern, western and central parts of the study area are affected by a high subsidence rate, so that the estimated subsidence rate in the north-western part of the study area is 40% higher compared to the central part and the subsidence rate in the central part is 30 % higher than in the southern part. In addition, groundwater abstraction between 2019 and 2025 is estimated at 10.65 m in the western part, which is 77.5 % higher than in the central part (6 m). The correspondence between the groundwater depletion and the estimated subsidence rate indicates the impact of groundwater overexploitation on the occurrence of subsidence in recent years.
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