[2] We study the sea surface transport in the Western Mediterranean Sea from a Lagrangian point of view, in particular the Alboran and the North-Western subbasins. The study is carried out through the analysis of 3 years of surface velocity model data through Finite Size Lyapunov Exponents, Residence Time, and virtual particle trajectories complementing the classical Eulerian approach. The spatiotemporal variability of the main transport processes is inferred from the Empirical Orthogonal Function modes of the Lyapunov Exponents, being the most relevant modes discussed and physically interpreted. Results indicate that some of the variability in the surface transport patterns in the Western Mediterranean can be explained by specific modes which provide an indication of connectivity among subbasins, like the inflow of Atlantic waters through the Ibiza Channel.
Abstract. The morphodynamic response of a microtidal beach under a storm group is
analyzed, and the effects of each individual event are inferred from a numerical
model, in situ measurements and video imaging. The combination of these
approaches represents a multiplatform tool for beach management, especially
during adverse conditions. Here, the morphodynamic response is examined
during a period with a group of three storms. The first storm, with moderate
conditions (Hs∼1 m during 6 h), eroded the aerial beach and
generated a submerged sandbar in the breaking zone. The bar was further
directed offshore during the more energetic second event (Hs=3.5 m and 53 h). The third storm, similar to the first one, hardly
affected the beach morphology, which stresses the importance of the beach
configuration previous to a storm. The volume of sand mobilized during the
storm group is around 17.65 m3 m−1. During the following months,
which are characterized by mild wave conditions, the aerial beach recovered
half of the volume of sand that is transported offshore during the storm
group (∼9.27m3m-1). The analysis of beach evolution shows
two different characteristic timescales for the erosion and recovery
processes associated with the storm and mild conditions, respectively.
In addition, the response depends largely on the previous beach morphological
state. The work also stresses the importance of using different tools
(video monitoring, modeling, and field campaign) to analyze beach
morphodynamics.
The literature on HTA influence remains limited, with little on longer term effects on practice and outcomes. The reviewed publications indicated how HTA is being used in different settings and approaches to measuring its influence that might be more widely applied, such as surveys and monitoring administrative data.
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