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Video-monitoraggio della variabilità morfologica delle barre sommerse: il caso del litorale di Terracina

Parlagreco, Luca (2011) Video-monitoraggio della variabilità morfologica delle barre sommerse: il caso del litorale di Terracina. PhD Thesis , Università degli Studi di Ferrara.

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    The response to a beach face nourishment of the Terracina barred beach (Tyrrhenian sea, Italy) is analyzed based on a bi-weekly data set of timex video-images collected during a 34-month period (January 2008 - October 2010). Proxies for shoreline and sandbar crest positions were extracted from video-images and compared with topo-bathymetric surveys. During the first 17 months part of the nourished sediments were moved seaward and a shore-parallel linear single-bar system was restored. Bar dynamic was mainly influenced by on/offshore movements in relation to storms occurrence. A cluster of southerly extreme storms with maximum wave height of 4m sharply reshaped the nearshore morphology and a new double-barred system developed. A new inner bar generated close to the shoreline and the pre-existing one migrated 50m offshore. After this morphological reset the outer bar remained inactive and preserved a linear morphology for the whole analyzed period. On the contrary, the new inner bar dynamic was characterized by limited cross-shore displacements and high alongshore morphologic variability. During the last 5 months of observations a single barred-system was restored since the outer bar crest lost its morphologic evidence. As a consequence the inner bar moved 20m offshore and straightened. Video-shoreline provided useful information on the alongshore averaged beach face displacements even if the alongshore variability of the inner surf zone was slightly represented by this kind of proxy.

    Item Type:Thesis (PhD Thesis)
    Date:11 March 2011
    Tutor:Simeoni, Umberto
    Coordinator:Beccaluva, Luigi
    Institution:Università degli Studi di Ferrara
    Divisions:Dipartimento > Scienze della terra
    Subjects:Area 04 - Scienze della terra > GEO/04 Geografia fisica e geomorfologia
    Uncontrolled Keywords:Barre sommerse, video-monitoraggio, morfodinamica costiera, ripascimenti, sandbars, video-monitoring, beach morphodynamic, beach nourishments
    Deposited on:13 Apr 2012 14:57


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