scholarly journals Western Mediterranean sea-level rise: Changing exchange flow through the Strait of Gibraltar

2000 ◽  
Vol 27 (18) ◽  
pp. 2949-2952 ◽  
Author(s):  
Tetjana Ross ◽  
Chris Garrett ◽  
Pierre-Yves Le Traon
Keyword(s):  
Sea Level Rise ◽  
Mediterranean Sea ◽  
Sea Level ◽  
Western Mediterranean ◽  
Exchange Flow ◽  
Strait Of Gibraltar ◽  
Western Mediterranean Sea ◽  
Flow Through

scholarly journals Repeated fluid expulsions during events of rapid sea-level rise in the Gulf of Lion, western Mediterranean Sea

2017 ◽  
Vol 188 (4) ◽  
pp. 24 ◽  
Author(s):  
Aurélien Gay ◽  
Thibault Cavailhès ◽  
Dominique Grauls ◽  
Bruno Marsset ◽  
Tania Marsset
Keyword(s):  
Sea Level Rise ◽  
Mediterranean Sea ◽  
Sea Level ◽  
Western Mediterranean ◽  
Unconsolidated Sediments ◽  
Geometrical Parameters ◽  
Near Surface ◽  
Western Mediterranean Sea ◽  
Gulf Of Lion ◽  
Potential Fluid

Based on a High-Resolution 3D seismic block acquired in the Gulf of Lion in 2004–2005 we investigated fluid pipes and pockmarks on the top of the interfluve between the Hérault canyon and the Bourcart canyon both created by turbidity currents and gravity flows from the shelf to the deep basin in the north-western Mediterranean Sea. Combining the geometry of the potential fluid pipes with the induced deformation of surrounding sediments leads then to the ability to differentiate between potential fluid sources (root vs source) and to better estimate the triggering mechanisms (allochtonous vs. autochtonous cause). We linked together a set of derived attributes, such as Chaos and RMS amplitude, to a 3D description of pipes along which fluids may migrate. As previously shown in other basins, the induced deformation, creating cone in cone or V-shaped structures, may develop in response to the fluid pipe propagation in unconsolidated sediments in the near surface. The level at the top of a cone structure is diachronous. It means that stratigraphic levels over this surface are deformed at the end of the migration. They collapse forming a depression called a pockmark. These pipes are the result of repeated cycles of fluid expulsion that might be correlated with rapid sea-level rise instead of sediment loading. The most recent event (MIS 2.2 stage) has led to the formation of a pockmark on the modern seafloor. It has been used as a reference for calculating the effect of a rapid sea-level rise on fluid expulsion. As all physical and geometrical parameters are constrained, we were able to define that a + 34 m of sea level rise may account for triggering fluid expulsion from a very shallow silty-sandy layer at 9 m below seafloor since the last glacial stage. This value is consistent with a sea level rise of about 102 m during this period. This study shows that the episodic nature of fluid release resulted from hydromechanical processes during sea-level rise due to the interactivity between high pressure regimes and principal in situ stresses.

scholarly journals Shoreline Response to Wave Forcing and Sea Level Rise along a Geomorphological Complex Coastline (Western Sardinia, Mediterranean Sea)

2021 ◽  
Vol 11 (9) ◽  
pp. 4009
Author(s):  
Simone Simeone ◽  
Luca Palombo ◽  
Emanuela Molinaroli ◽  
Walter Brambilla ◽  
Alessandro Conforti ◽  
...  
Keyword(s):  
Grain Size ◽  
Sea Level Rise ◽  
Mediterranean Sea ◽  
Sea Level ◽  
Morphological Changes ◽  
Wave Climate ◽  
Western Mediterranean ◽  
Single Beam ◽  
Western Mediterranean Sea ◽  
Submerged Area

Beaches responses to storms, as well as their potential adaptation to the foreseeable sea level rise (SLR), were investigated along three beaches in a coastal tract in western Sardinia (Western Mediterranean Sea). The grain size of the sediments, the beach profile variability and the wave climate were analyzed in order to relate morphological changes, geological inheritances and waves forcing. Multibeam, single-beam and lidar data were used to characterize the inner shelf morphologies and to reproduce the flooding due to the SLR. The studied beaches experienced major changes when consecutive storms, rather than singles ones, occurred along the coastline. The sediment availability, the grain size and the geomorphological structure of the beaches were the most important factors influencing the beach response. On the sediment-deprived coarse beaches the headlands favor the beach rotation, and the gravel barrier morphology can increase the resistance against storms. On the sediment-abundant beaches, the cross-shore sediment transport towards a submerged area leads to a lowering in the subaerial beach level and a contemporaneous shoreline retreat in response to storms. A very limited ingression of the sea is related to the SLR. This process may affect (i) the gravel barrier, promoting a roll over due to the increase in overwash; (ii) the embayed beach increasing its degree of embayment as headlands become more prominent, and (iii) the sediment-abundant beach with an erosion of the whole subaerial beach during storms, which can also involve the foredune area.

scholarly journals The Meandering Path of a Drifter around the Western Alboran Gyre

2004 ◽  
Vol 34 (3) ◽  
pp. 685-692 ◽  
Author(s):  
Jesús García Lafuente ◽  
Javier Delgado
Keyword(s):  
Mediterranean Sea ◽  
Surveillance System ◽  
Relative Vorticity ◽  
Western Mediterranean ◽  
Tidal Currents ◽  
Strait Of Gibraltar ◽  
Short Scale ◽  
Western Mediterranean Sea ◽  
Alboran Basin ◽  
Drifter Trajectory

Abstract An accidentally released drifter in the eastern section of the Strait of Gibraltar, whose successive positions were tracked by the Argos surveillance system, was advected more than 170 km around the western Alboran gyre in the Alboran Sea of the western Mediterranean Sea during four days. The drifter trajectory along the gyre's periphery was wavelike around a hypothetical smoothed streamline, with a period of 35 h and an amplitude of approximately 2 km. Temperature observations confirm the wavelike nature of the trajectory. Neither tidal currents within the Alboran basin nor wind-related forcing are able to explain the observed path. The interaction of the incoming Atlantic jet and the western Alboran gyre at the place where they meet together with the existence of relative vorticity pulses of the Atlantic jet associated with tidal currents in the strait is put forward as a likely mechanism that generates short-scale eddies in which the drifter could have been trapped. The subsequent advection of such an eddy around the gyre would depict the observed wavelike trajectory.

scholarly journals Impact of relative sea level and rapid climate changes on the architecture and lithofacies of the Holocene Rhone subaqueous delta (Western Mediterranean Sea)

2014 ◽  
Vol 305 ◽  
pp. 35-53 ◽  
Author(s):  
Anne-Sophie Fanget ◽  
Serge Berné ◽  
Gwénaël Jouet ◽  
Maria-Angela Bassetti ◽  
Bernard Dennielou ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Sea Level ◽  
Climate Changes ◽  
Western Mediterranean ◽  
Relative Sea Level ◽  
The Holocene ◽  
Western Mediterranean Sea

scholarly journals The 100-ka and rapid sea level changes recorded by prograding shelf sand bodies in the Gulf of Lions (western Mediterranean Sea)

2008 ◽  
Vol 9 (11) ◽  
pp. n/a-n/a ◽  
Author(s):  
M. A. Bassetti ◽  
S. Berné ◽  
G. Jouet ◽  
M. Taviani ◽  
B. Dennielou ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Sea Level ◽  
Western Mediterranean ◽  
Sea Level Changes ◽  
Gulf Of Lions ◽  
Western Mediterranean Sea ◽  
Sand Bodies

A highly resolved record of relative sea level in the western Mediterranean Sea during the last interglacial period

2018 ◽  
Vol 11 (11) ◽  
pp. 860-864 ◽  
Author(s):  
Victor J. Polyak ◽  
Bogdan P. Onac ◽  
Joan J. Fornós ◽  
Carling Hay ◽  
Yemane Asmerom ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Sea Level ◽  
Western Mediterranean ◽  
Interglacial Period ◽  
Last Interglacial ◽  
Relative Sea Level ◽  
Western Mediterranean Sea ◽  
Last Interglacial Period
Sign in / Sign up

Export Citation Format

Share Document