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Land Subsidence Analysis in The Paths of Power Transmission Lines Using Displacement Gradients from Radar Interferometric Observations
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Hamed Amirkhani   , Behzad Vosoghi * |
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Abstract: (10 Views) |
The study of land subsidence and its associated displacements has become one of the major research topics globally, especially in Iran. A key aspect in examining this phenomenon is the assessment of the hazards it poses. Although land subsidence is recognized as a destructive phenomenon, when a displacement gradient is formed in the Earth's crust, the subsidence appears in a differential manner and poses a serious threat to structures and infrastructure.
Field evidence and conducted studies indicate that part of the Eshtehard and Qazvin plain has experienced subsidence due to excessive groundwater extraction for industrial and agricultural purposes. In this area, several power transmission lines with high-voltage towers are located, and differential subsidence can cause serious and irreversible risks to them.
Accordingly, this research investigates the subsidence that occurred in this plain along one of the power transmission lines during the period from 2018 to 2023, using InSAR technology and the displacement gradients derived from it. To apply InSAR, LiCSAR system data were processed using the LiCSBAS time series software, and the Recursive Moving Least Squares (RMLS) numerical method was used to calculate the displacement gradients.
The results showed that the studied power transmission line is completely exposed to subsidence. The maximum land subsidence rate in the area and along the transmission line was estimated at –80 mm/year and –57 mm/year, respectively. Also, the maximum displacement gradient rate in the region and along the studied line was calculated to be 114 mm/km/year and 68 mm/km/year, respectively.
Finally, by examining the longitudinal profile of the subsidence gradient along the transmission line, it was observed that at power towers No. 83 and 84, with subsidence rates of –52 mm/year and –51 mm/year, the gradient magnitude was estimated at 27 and 24 mm/km/year, respectively; and at power towers No. 30 and 97, with subsidence rates of –27 mm/year and –13 mm/year, the gradient magnitudes were 31 and 39 mm/km/year.
Therefore, the results indicate that there is no direct correlation between the subsidence rate and its gradient; thus, analyzing the displacement gradient is of particular importance in studying land subsidence.
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Article number: 3 |
| Keywords: Land Subsidence, InSAR, Displacement Gradient, Power Transmission Lines, Differential Subsidence |
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Full-Text [PDF 1223 kb]
(17 Downloads)
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Type of Study: Research |
Subject:
Geo&Hydro
Received: 2025/05/26 | Accepted: 2025/09/28
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