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<p>Nile Delta is significantly affected by land subsidence and sea level rise due to anthropogenic activities and change global warming. In this study, the subsidence rates along the northeast (Port Said) and central parts (Tanta &amp; Kafr Al-Zayat) of Nile Delta, Egypt were accurately investigated using the Small Baseline Subset (SBAS) technique and dense SAR data. A total of 26 Sentinel-1A satellite images covering the period from 2017 to 2021 were processed using a coherence threshold value of 0.4 and 75 ground control points (GCPs). The final estimated average subsidence velocity rates of Port Said and Tanta cities were about −&#xa0;10 and − 25&#xa0;mm/year, with total vertical displacement of −&#xa0;27&#xa0;mm and −&#xa0;44&#xa0;mm during the investigated periods, respectively. In general, the central part of the Nile Delta shows higher subsidence rates than the north eastern parts. In contrast to previous interpretations of land subsidence causes along the Nile Delta, which were controlled by natural processes, our findings show localized subsidence related to the ongoing vertical and horizontal urban expansions and groundwater extraction. In addition, the integrated effect of the sea level rise due to climate change as well as land subsidence was simulated to show which city (Port Said or Tanta) will be severely submerged due to such rise.</p>

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Mapping the expected combined impact of climate change and land subsidence on selected cities along the Nile Delta using radar images

  • 期刊论文

  • 发表日期：

    2025年5月5日

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  • Sherif A. Kamal,
  • Noura Darwish,
  • Eslam Alhogoraty,
  • Mona Kaiser,
  • Khaled Abdelbasset,
  • Ahmed Gaber

摘要

Nile Delta is significantly affected by land subsidence and sea level rise due to anthropogenic activities and change global warming. In this study, the subsidence rates along the northeast (Port Said) and central parts (Tanta & Kafr Al-Zayat) of Nile Delta, Egypt were accurately investigated using the Small Baseline Subset (SBAS) technique and dense SAR data. A total of 26 Sentinel-1A satellite images covering the period from 2017 to 2021 were processed using a coherence threshold value of 0.4 and 75 ground control points (GCPs). The final estimated average subsidence velocity rates of Port Said and Tanta cities were about − 10 and − 25 mm/year, with total vertical displacement of − 27 mm and − 44 mm during the investigated periods, respectively. In general, the central part of the Nile Delta shows higher subsidence rates than the north eastern parts. In contrast to previous interpretations of land subsidence causes along the Nile Delta, which were controlled by natural processes, our findings show localized subsidence related to the ongoing vertical and horizontal urban expansions and groundwater extraction. In addition, the integrated effect of the sea level rise due to climate change as well as land subsidence was simulated to show which city (Port Said or Tanta) will be severely submerged due to such rise.