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Horizontal Transport and Mixing and their connection with Dynamical and Biological Processes in the Ocean

AutorHernández Carrasco, Ismael
DirectorLópez, Cristóbal ; Hernández-García, Emilio
Fecha de publicaciónmay-2013
EditorUniversidad de las Islas Baleares
CSIC-UIB - Instituto de Física Interdisciplinar y Sistemas Complejos (IFISC)
ResumenHorizontal transport and mixing processes are central to the study of the physical, chemical, and biological dynamics of the ocean. Correct understanding and precise modelling of them are relevant from a theoretical viewpoint and crucial for a range of practical issues, such as plankton dynamics or the fate of pollutant spills. In this regard, the last few years have seen the appearance of interesting new developments on the Lagrangian description of transport and mixing phenomena, many of them coming from the area of nonlinear dynamics. Such approaches do not aim at predicting individual tracer trajectories, but at locating spatial structures that are known from dynamical systems theory to act as templates for the whole flow (Leong and Ottino, 1989; Wiggins, 1992). This is mainly due to the capacity of the Lagrangian diagnostics to exploit the spatiotemporal variability of the velocity field by following fluid particle trajectories, at di erence of Eulerian ones which analyze frozen snapshots of data. Among these Lagrangian techniques, a powerful class consists in the computation of local Lyapunov exponents (LLE) which measure the relative dispersion of transported particles. In particular, there are the so called finite-size Lyapunov exponents (FSLEs) where one computes the time taken by two trajectories, initially separated by a finite distance, to reach a larger final finite distance.
DescripciónTesis doctoral presentada para optar al título de Doctor en la Universitat de les Illes Balears.
Aparece en las colecciones: (IFISC) Tesis
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