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Titolo/Abstract/Parole chiave

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. Tesi di Dottorato , Università degli Studi di Ferrara.

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    Abstract

    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.

    Tipologia del documento:Tesi di Dottorato (Tesi di Dottorato)
    Data:11 Marzo 2011
    Relatore:Simeoni, Umberto
    Coordinatore ciclo:Beccaluva, Luigi
    Istituzione:Università degli Studi di Ferrara
    Dottorato:XXIII Anno 2008 > SCIENZE DELLA TERRA
    Struttura:Dipartimento > Scienze della terra
    Soggetti:Area 04 - Scienze della terra > GEO/04 Geografia fisica e geomorfologia
    Parole chiave:Barre sommerse, video-monitoraggio, morfodinamica costiera, ripascimenti, sandbars, video-monitoring, beach morphodynamic, beach nourishments
    Depositato il:13 Apr 2012 14:57

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