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<p>This study highlights the self-regulation mechanisms that mark a highly vulnerable microtidal barrier (of Ghar el Melh) in the Gulf of Tunis. The microtidal barrier has been affected by rising sea levels over the last forty years, starting in 1985. Coexistence of this barrier involves a regular rollover and continuous translational sediments toward the back barrier. A series of Landsat images taken in 1985, 1998, 2010, and 2024 showed varying rates of landward migration. Values ranged from 12.5&#xa0;m/year ± 2&#xa0;m to 20&#xa0;m/year ± 2&#xa0;m in the northern and southern parts of the barrier, respectively. The ongoing displacement of the sandy barrier is evident in the exhumed clay deposits, which range in thickness from 0.4 to 1&#xa0;m and are located in the swash zone. These are typical of low-energy lagoon deposits. Morphodynamic adjustment of the barrier (rollover) was sustained within a negative sediment budget; the initial barrier size has been reduced by 50% from 1985 to 2024. The longevity of the microtidal barrier is dependent on accommodation and rollover process.</p>

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Self-Regulation Pattern of Modern Microtidal Barrier Experiencing the Rising Sea Level in Southern Mediterranean Coasts

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Maher Gzam,
  • Avouca Mahamoud,
  • Mustapha Hidouri,
  • Laurent Dezileau

摘要

This study highlights the self-regulation mechanisms that mark a highly vulnerable microtidal barrier (of Ghar el Melh) in the Gulf of Tunis. The microtidal barrier has been affected by rising sea levels over the last forty years, starting in 1985. Coexistence of this barrier involves a regular rollover and continuous translational sediments toward the back barrier. A series of Landsat images taken in 1985, 1998, 2010, and 2024 showed varying rates of landward migration. Values ranged from 12.5 m/year ± 2 m to 20 m/year ± 2 m in the northern and southern parts of the barrier, respectively. The ongoing displacement of the sandy barrier is evident in the exhumed clay deposits, which range in thickness from 0.4 to 1 m and are located in the swash zone. These are typical of low-energy lagoon deposits. Morphodynamic adjustment of the barrier (rollover) was sustained within a negative sediment budget; the initial barrier size has been reduced by 50% from 1985 to 2024. The longevity of the microtidal barrier is dependent on accommodation and rollover process.