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The analyzes carried out in the marine sediments sampled in the port and coastal areas of Reunion show, for certain metallic trace elements, significant variations in their contents and regular overruns of the regulatory thresholds for the management of dredged sediments. Several studies show that the volcanic nature of Reunion Island is the cause of high concentrations of metals in the soil. The objective of this study is to define, whether the observed exceedances of the management thresholds for dredged sediments are due to the geology of the island or to contributions of anthropogenic origin.
Sedimentation and deposition. --- Sedimentation and deposition --- Analysis.
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In der vorliegenden Arbeit wurde mit der Entwicklung einer differentiellen Turbulenzsäule das advektionsfreie Turbulenzprofil einer offenen Gerinneströmung im Labor nachgebildet. Hierin konnten die Prozesse der Feinsedimentdynamik nachgebildet und gemessen werden. Die Ergebnisse beschreiben den Prozessablauf in der Feinsedimentdynamik und dienten als Grundlage für die Entwicklung und Validierung eines Modells zur Bilanzierung der Feinsedimentdynamik in der Wassersäule.
Aggregation --- Sediment --- Feinsediment --- Turbulenz --- Sedimentation
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Sediment deficits on Mediterranean coasts have resulted from anthropogenic fragmentation of rivers and loss of sediment flux connectivity caused by dams, river engineering, and aggregate extraction. Coastal sediment transport cells are now characterized by artificial boundaries that impair alongshore sediment connectivity. Climate change and sea-level rise will cause further vulnerability of the Mediterranean's fragmented rivers and coasts and there is, therefore, an urgent need to foster efforts aimed at re-establishing fluvial and alongshore sediment connectivity.
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552.5 --- Sedimentary rocks --- Sedimentation and deposition. --- Sedimentation --- Sedimentation. --- 552.5 Sedimentary rocks
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Alluvium --- Sédimentation (Géologie) --- Alluvium. --- Sédimentation (Géologie) --- Sedimentation and deposition. --- Sedimentation and deposition
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