مطالعات جغرافیایی مناطق خشک (Nov 2024)

Analysis of the role of human factors in the occurrence of subsidence using satellite images and radar (Case study: Pishva city)

  • mehdi safari namivandi,
  • Maesomeh Asadi,
  • Saiad Irani Haris,
  • Abolfazl Amini

DOI
https://doi.org/10.22034/jargs.2023.409440.1053
Journal volume & issue
Vol. 15, no. 57
pp. 39 – 23

Abstract

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Aim: Land subsidence is an invisible danger that has faced many cities in Iran, including Pishva, with a serious challenge. The importance of subsidence has led to the evaluation of the amount of subsidence in the urban area and outskirts of Pishva using radar images and the SBAS time series method (2020-2022) in this research.Material & Method: In this research, Landsat satellite images, Sentinel 1 radar images, and library information were used as research data to achieve the desired goals. The working method has been that first, using satellite images, the trend of land use changes in the region has been evaluated, and then, based on the available information, the state of the decline of underground water resources in the region has been investigated. In the following, the subsidence rate of the region has been calculated using the SBAS time series method.Finding: The results of this research have shown that the studied area has subsided between 107 and 411 mm during a 2-year period (2020 to 2022), based on which it can be said that the maximum annual subsidence of the area is more than 20 cm. The results of the evaluation of land use changes in the region have shown that during the 30 years (1991 to 2021), the land use of manufactured areas has increased from 2.2 to 9.6 square kilometers. Also, the level of piezometric wells in the region has faced an annual drop of more than 1 meter.Conclusion: Considering that the development of manufactured uses is associated with an increase in the pressure on the earth's surface, and also the development of residential and industrial areas is associated with an increase in the use of underground water resources, the changes in land uses during recent years, the context has provided for subsidence in the region.Innovation: The method's high precision allows the research results to be used for various construction planning.

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