Medium-term dynamics of a Middle Adriatic barred beach
Other literature type
In the recent years, attention has been paid to beach protection by means
of soft and hard defenses. Along the Italian coasts of the Adriatic Sea,
sandy beaches are the most common landscapes and around 70 % of the
Marche-Region coasts (central Adriatic), is protected by defense structures.
The longest free-from-obstacle nearshore area in the region includes the
beach of Senigallia, characterized by a multiple barred beach, frequently
monitored during the last decades. The bathymetries surveyed in 2006, 2010,
2011, 2012 and 2013 show long-term stability, confirmed by a good adaptation of an analyzed stretch of the beach to the Dean-type
equilibrium profile, though a strong short-/medium-term variability of the
wave climate has been observed during the monitored periods. This suggests a
slight influence of wave forcing on the long-term profiles, which seems to
only depend on the sediment size. Further, the medium-term dynamics of the
submerged bars and their geometric features have been related to the wave
climate collected, during the analyzed temporal windows, by a wave buoy
located 40 km off Senigallia. An overall interpretation of the
complete dynamics, i.e. hydrodynamics (buoy data), sediment characteristics
(equilibrium-profile <i>A</i> parameter) and morphodynamics (bathymetric surveys),
suggests that the wave climate is fundamental for the morphodynamic changes
of the beach in the medium term: waves coming from NNE/ESE, characterized
by a larger/smaller steepness and by a larger/smaller relative wave height,
induce seaward/shoreward bar migration, as well as bar smoothing/steepening.
Moving southeastward, the bar dimension increases, while the equilibrium profile shape suggests the adaptation to a decreasing sediment size in the submerged beach. This is probably due to the presence of both the harbor jetty and river mouth North of the investigated area.