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-monitoring of a barred nourished beach (Latium, Central Italy)

ARCHETTI, RENATA;
2011

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.
L. Parlagreco; R. Archetti; U. Simeoni; S. Devoti; A. Valentini; S. Silenzi
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/102676
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