Multi-criteria approaches to identify the shoreline retreat downstream of dams: the North African case
<p>Northern African beaches are among the most vulnerable areas under the extreme climate change hazard. Mainly sedimentary low-lying platform, the coasts are supplied by terrestrial yields, which are increasingly interrupted by dams. Unfortunately, the sediment fluxes are rarely measured and...
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| Autores principales: | , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Copernicus Publications
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/5149aecd3f5441ce8ae762613e4827be |
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| Sumario: | <p>Northern African beaches are among the most vulnerable
areas under the extreme climate change hazard. Mainly sedimentary low-lying
platform, the coasts are supplied by terrestrial yields, which are
increasingly interrupted by dams. Unfortunately, the sediment fluxes are
rarely measured and monitored, so that it is quite impossible today to
assess the contribution of continental sediments to the coast and its
variability. The aim of our study is to determine the sampling protocol of
delta sedimentation plain and nearshore seabed for better understanding of
the anthropogenic driver in contrast to climate change. We adopt a
multi-criteria analysis based both on the geomorphologic feature and the
historic evolution from the River to the littoral plain. The shoreline
evolution reveals an alarming retreat trend reaching <span class="inline-formula">−20</span> m <span class="inline-formula">±</span> 0.15 m yr<span class="inline-formula"><sup>−1</sup></span> after the human-induced change where <span class="inline-formula">∼50</span> % of
sediment discharge has been trapped upstream the dam, including quite all
the coarse material, like sand. The shoreline retreat and the decreasing
sediment rate of fluvial flow are all due to the dam construction.</p> |
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