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<p>Coastal erosion is one of the most serious problems facing sandy coasts worldwide. The Béjaïa Bay, which opens onto the Mediterranean Sea, is an important geographical location in the region, and its coastline occupies a significant part of the Algerian coastal strip. However, it is not immune to the phenomenon of erosion. The Sidi Ali Lebhar beach on Béjaïa’s west coast has experienced significant shoreline retreats in recent decades. A study of the coastline’s historical evolution over 62 years (1960–2022) revealed significant recession rates of around − 3.5&#xa0;m/year. The aim was to define eroding and accreting sectors by combining a quantitative approach to long- and medium-term shoreline evolution with various data sources (corrected aerial photographs, satellite images, and DGPS topographic surveys) through the DSAS (Digital Shoreline Analysis System) extension. Second, we used a two-dimensional (2D) modeling approach with a Mike 21-SW wave propagation model to understand the hydrosedimentary functioning of the coast by varying wave parameters from the open sea to the coast (Hs, Tp, and MWD). The results indicate that swells from the dominant directions (N, NE, and NW) are weakly refracted and reach the coast with high energy. The reduction in significant wave height varies depending on the swell direction: Swells from N45° decrease by 24.8%, swells from N330° by 52.8%, and swells from N360° by 35.6%. This illustrates how wave energy dissipates as it approaches the coast. Understanding the operating characteristics of the coastline and its hydrodynamic processes is critical to the long-term management of this fragile, ever-changing environment.</p><p> <?noindent??><b>Clinical Trial Number</b> Not applicable.</p>

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Multidecadal Shoreline Changes Analysis Using Geospatial Tools and DSAS: the Case of the West Coast of the Béjaïa Bay (North-Central Algeria)

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • Katia Ayadi,
  • Saci Kermani,
  • Dalila Khalfani,
  • Makhlouf Boutiba

摘要

Coastal erosion is one of the most serious problems facing sandy coasts worldwide. The Béjaïa Bay, which opens onto the Mediterranean Sea, is an important geographical location in the region, and its coastline occupies a significant part of the Algerian coastal strip. However, it is not immune to the phenomenon of erosion. The Sidi Ali Lebhar beach on Béjaïa’s west coast has experienced significant shoreline retreats in recent decades. A study of the coastline’s historical evolution over 62 years (1960–2022) revealed significant recession rates of around − 3.5 m/year. The aim was to define eroding and accreting sectors by combining a quantitative approach to long- and medium-term shoreline evolution with various data sources (corrected aerial photographs, satellite images, and DGPS topographic surveys) through the DSAS (Digital Shoreline Analysis System) extension. Second, we used a two-dimensional (2D) modeling approach with a Mike 21-SW wave propagation model to understand the hydrosedimentary functioning of the coast by varying wave parameters from the open sea to the coast (Hs, Tp, and MWD). The results indicate that swells from the dominant directions (N, NE, and NW) are weakly refracted and reach the coast with high energy. The reduction in significant wave height varies depending on the swell direction: Swells from N45° decrease by 24.8%, swells from N330° by 52.8%, and swells from N360° by 35.6%. This illustrates how wave energy dissipates as it approaches the coast. Understanding the operating characteristics of the coastline and its hydrodynamic processes is critical to the long-term management of this fragile, ever-changing environment.

Clinical Trial Number Not applicable.