| Autor: |
Signa Geraldina, Cassetti Federica, Noè Simona, Pampalone Vincenzo, Savona Andrea, Pirrotta Maria, Andolina Cristina, Tramati Cecilia, Vizzini Salvatrice, Mazzola Antonio, Calvo Sebastiano, Tomasello Agostino |
| Přispěvatelé: |
Signa Geraldina, Cassetti Federica, Noè Simona, Pampalone Vincenzo, Savona Andrea, Pirrotta Maria, Andolina Cristina, Tramati Cecilia, Vizzini Salvatrice, Mazzola Antonio, Calvo Sebastiano, Tomasello Agostino |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
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| Popis: |
Posidonia oceanica is an endemic Mediterranean seagrass that forms wide and dense meadows from the surface to depths of about 40 m. During fall and winter, due to aging and storms, leaves and rhizomes break away from the seagrass meadows and accumulate on the shores (from a few centimeters in the water to several meters inshore) forming conspicuous beach-casts of P. oceanica detritus. These structures have received increasing attention in the last decade for the potential ecosystem services they provide in protecting the coast from erosion, linking marine and terrestrial food chains and contributing to carbon and nutrients fluxes. However, seagrass beach-cast morphology is not easy to estimate because: i) beach-casts have a complex dynamics; ii) they can reach very large extensions; iii) their shapes are not comparable with standard geometric figures. The aim of this study was to investigate the morphology and dynamics of P. oceanica beach-casts in three beaches of Sicily (Capo Feto, Maragani and Scala dei Turchi) characterized by different productivity of the nearshore meadows. A remote sensing approach was used to assess the beachcast extension, morphology, volume and derivate parameters. In particular, very high resolution drone images, combined with GPS field data, were used to obtain a 3D-reconstruction of P. oceanica beach-casts. Generated ortophotos and digital elevation model were imported into geospatial analysis software to quantify volumes and their spatial and temporal evolutions. The 3D-model allowed to accurately estimate different levels of seagrass detritus accumulation. This approach enables to achieve a more detailed and complete understanding on the role of P. oceanica detritus beach-casts in coastal marine dynamics. This might also contribute to gain a better insight into the ecosystem services they provide. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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