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<p>Coastal areas face significant pressures from both natural events and human activities, making it important to evaluate these impacts carefully. This study aims to monitor human activities by analyzing river discharges, identify potential ecological risks, and study long-term changes in metal contamination in the Monastir-Sayada region. Four cores sediment samples were collected from four different locations along the Monastir coast, specifically near the source of pollution, in order to analyze the concentrations of heavy metals in sediments cores like zinc (Zn), cadmium (Cd), copper (Cu), lead (Pb), manganese (Mn), nickel (Ni), and iron (Fe). The results indicate that the average concentrations of these metals in the sediment cores followed a descending order of Fe &gt; Zn &gt; Mn &gt; Cu &gt; Cd in front of the Monastir outlet (core sediment FM), Fe &gt; Mn &gt; Zn &gt; Pb &gt; Cd &gt; Cu &gt; Ni in the outlet at Frina region (core sediment FKH), Fe &gt; Mn &gt; Zn &gt; Cd &gt; Ni &gt; Pb &gt; Cu in the outlet of Melah stream (core sediment OM), and Fe &gt; Mn &gt; Cd &gt; Zn &gt; Cu in front of the outlet Essouk stream at Lamta (core sediment OS). Enrichment Factors (EFs) and Contamination Factors (CFs) were applied to evaluate the degree of metal enrichment and pollution, showing that the Monastir-Sayada coast is highly contaminated by Pb and Cd, and is therefore subject to a relatively high potential ecological risk. Heavy metals are thought to come from comparable human activities, as shown by the results of principal component analysis (PCA) and cluster analysis (CA). The transport of pollutants in the core sediments is closely linked to sediment dynamics and the influence of coastal drift, with a North–South drift occurring at the surface and a South–North drift in deeper layers.</p>

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Dynamics of metal contamination along the Monastir-Sayada coast: sediment core observations and multivariate analysis

  • 期刊论文

  • 发表日期：

    2025年8月5日

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  • Nouha Khiari,
  • Abdelkrim Charef,
  • Samia Khadhar,
  • Faouzi Zahi

摘要

Coastal areas face significant pressures from both natural events and human activities, making it important to evaluate these impacts carefully. This study aims to monitor human activities by analyzing river discharges, identify potential ecological risks, and study long-term changes in metal contamination in the Monastir-Sayada region. Four cores sediment samples were collected from four different locations along the Monastir coast, specifically near the source of pollution, in order to analyze the concentrations of heavy metals in sediments cores like zinc (Zn), cadmium (Cd), copper (Cu), lead (Pb), manganese (Mn), nickel (Ni), and iron (Fe). The results indicate that the average concentrations of these metals in the sediment cores followed a descending order of Fe > Zn > Mn > Cu > Cd in front of the Monastir outlet (core sediment FM), Fe > Mn > Zn > Pb > Cd > Cu > Ni in the outlet at Frina region (core sediment FKH), Fe > Mn > Zn > Cd > Ni > Pb > Cu in the outlet of Melah stream (core sediment OM), and Fe > Mn > Cd > Zn > Cu in front of the outlet Essouk stream at Lamta (core sediment OS). Enrichment Factors (EFs) and Contamination Factors (CFs) were applied to evaluate the degree of metal enrichment and pollution, showing that the Monastir-Sayada coast is highly contaminated by Pb and Cd, and is therefore subject to a relatively high potential ecological risk. Heavy metals are thought to come from comparable human activities, as shown by the results of principal component analysis (PCA) and cluster analysis (CA). The transport of pollutants in the core sediments is closely linked to sediment dynamics and the influence of coastal drift, with a North–South drift occurring at the surface and a South–North drift in deeper layers.