Investigation of subsidence trend in Isfahan plain using radar differential interferometry technique

Subject Areas : Applications in natural hazard and disaster

Marjan Talebiniya ¹ , Hassan Khosravi ² , Gholamreza Zehtabian ³ , Arash Malekian ⁴ , Hamidreza Keshtkar ⁵

1 - PhD Student in Desert Management and Control, Department of Arid and Mountainous
2 - Associate ProfessorDepartment of Arid and Mountainous Regions Reclamation, Faculty of Natural Resources, University of Tehran, Iran
3 - Professor, Department of Arid and Mountainous Regions Reclamation, Faculty of Natural Resources, University of Tehran, Iran
4 - Associate Professor, Department of Arid and Mountainous Regions Reclamation, Faculty of Natural Resources, University of Tehran, Iran
5 - Assistant Professor, Department of Arid and Mountainous Regions Reclamation, Faculty of Natural Resources, University of Tehran, Iran

Received: 2022-01-30 Accepted : 2022-03-29 Published : 2023-05-22

Keywords: Subsidence, land use, Sentinel-1 A, Spatial Information System, Isfahan plain,

Abstract :

In the present study, to investigate the occurrence of land subsidence in Isfahan plain, SNAP8.0 software and radar differential interferometry technique were used. For this purpose, after processing Sentinel-1A images in the period 2019-2015, rate and intensity subsidence maps were prepared in the desired period. Also, changes in groundwater water level in the period 2002-2018, as one of the geodetic factors affecting subsidence, were studied to match the points that have subsidence. Then the output of SNAP software was studied using ArcGIS10.8, with land use layers and average water level changes and Maps of mean subsidence changes, groundwater drop, standard deviation and time of maximum subsidence were prepared. The results show the occurrence of subsidence phenomenon in areas with groundwater decline with urban use, roads and agricultural lands with a maximum rate of 14.2- 20.8 cm in the years 2018-2019. The average change represents the maximum subsidence of 9.6 cm per year, in line with the satellite line of sight, in the urban area. Also, spatial analysis of subsidence hazards at strategic points showed that the study area needs to provide the necessary warnings for the occurrence of subsidence crisis on a larger scale in the future.

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