Horizontal Lagrangian transport in a tidal-driven estuary—Transport barriers attached to prominent coastal boundaries

Huhn, Florian; Kameke, Alexandra von; Allen-Perkins, Silvia; Montero, Pedro; Venâncio, A.; Pérez‐Muñuzuri, V.

doi:10.1016/j.csr.2012.03.005

Cited by 51 publications

(38 citation statements)

References 71 publications

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“…This could suggest that some relevant aspects of near-shore transports are not properly represented in both models. Surprisingly small effects of resolutions in both space and time on the metrics for Lagrangian predictability were also reported by Huntley et al (2011).…”

Section: Discussionmentioning

confidence: 90%

“…Barron et al (2007) provide a list of typical separation rates in different regions worldwide. For an experiment in the Ria de Vigo estuary in north-west Spain, Huhn et al (2012) reported simulation errors that were relatively small compared to those typically found in the open ocean. This study tries to provide a realistic estimate of how reliable operational forecasts in the German Bight, another shelf sea region, can be expected to be.…”

Section: Introductionmentioning

confidence: 99%

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Surface drifters in the German Bight: model validation considering windage and Stokes drift

et al. 2017

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Abstract. Six surface drifters (drogued at about 1 m depth) deployed in the inner German Bight (North Sea) were tracked for between 9 and 54 days. Corresponding simulations were conducted offline based on surface currents from two independent models (BSHcmod and TRIM). Inclusion of a direct wind drag (0.6 % of 10 m wind) was needed for successful simulations based on BSHcmod currents archived for a 5 m depth surface layer. Adding 50 % of surface Stokes drift simulated with a third-generation wave model (WAM) was tested as an alternative approach. Results resembled each other during most of the time. Successful simulations based on TRIM surface currents (1 m depth) suggest that both approaches were mainly needed to compensate insufficient vertical resolution of hydrodynamic currents.The study suggests that the main sources of simulation errors were inaccurate Eulerian currents and lacking representation of sub-grid-scale processes. Substantial model errors often occurred under low wind conditions. A lower limit of predictability (about 3-5 km day −1 ) was estimated from two drifters that were initially spaced 20 km apart but converged quickly and diverged again after having stayed at a distance of 2 km or less for about 10 days. In most cases, errors in simulated 25 h drifter displacements were of similar order of magnitude.

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Section: Discussionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Surface drifters in the German Bight: model validation considering windage and Stokes drift

et al. 2017

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“…1), but can be applied to any type of equation used to describe the motion in an N-dimensional flow as well as the associated transport and mixing properties. It can be generalized to any type of particle motion, such as the dispersion of marine litter (micro and macro plastics) (Lebreton et al, 2012), or the motion of drifting buoys near the coast where inertial effects may be particularly relevant (Huhn et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

A method to calculate finite-time Lyapunov exponents for inertial particles in incompressible flows

Garaboa-Paz

Pérez‐Muñuzuri

2015

Nonlin. Processes Geophys.

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Abstract. The present study aims to improve the calculus of finite-time Lyapunov exponents (FTLEs) applied to describe the transport of inertial particles in a fluid flow. To this aim, the deformation tensor is modified to take into account that the stretching rate between particles separated by a certain distance is influenced by the initial velocity of the particles. Thus, the inertial FTLEs (iFTLEs) are defined in terms of the maximum stretching between infinitesimally close trajectories that have different initial velocities. The advantages of this improvement, if compared to the standard method (Shadden et al., 2005), are discussed for the double-gyre flow and the meandering jet flow. The new method allows one to identify the initial velocity that inertial particles must have in order to maximize their dispersion.

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“…The bay is a semi-enclosed basin located in the southwest of the island of Mallorca (western Mediterranean Sea), whose coastal flow is mainly induced by wind (Jordi et al, 2009(Jordi et al, , 2011. Forcing by tides is almost negligible with a tidal amplitude of less than 0.25 m. This makes the dynamics here different form other locations (e.g., Shadden et al, 2009;Huhn et al, 2012) where tides are dominant, and therefore provides the opportunity to test the performance of dynamical systems tools in this situation in which forcing only acts directly on the sea surface, and in which there are rather different forcing regimes depending on the season. The Lagrangian diagnosis will be obtained from velocity data of a realistic numerical model at high resolution, which resolves spatial scales of a few hundred of meters.…”

Section: Hernández-carrasco Et Al: Lagrangian Transport In a Coasmentioning

confidence: 99%

Lagrangian transport in a microtidal coastal area: the Bay of Palma, island of Mallorca, Spain

Hernández‐Carrasco

López

Orfila

et al. 2013

Nonlin. Processes Geophys.

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Abstract. Coastal transport in the Bay of Palma, a small region in the island of Mallorca, Spain, is characterized in terms of Lagrangian descriptors. The data sets used for this study are the output for two months (one in autumn and one in summer) of a high resolution numerical model, ROMS (Regional Ocean Model System), forced atmospherically and with a spatial resolution of 300 m. The two months were selected because of their different wind regime, which is the main driver of the sea dynamics in this area. Finitesize Lyapunov exponents (FSLEs) were used to locate semipersistent Lagrangian coherent structures (LCS) and to understand the different flow regimes in the bay. The different wind directions and regularity in the two months have a clear impact on the surface bay dynamics, whereas only topographic features appear clearly in the bottom structures. The fluid interchange between the bay and the open ocean was studied by computing particle trajectories and residence time (RT) maps. The escape rate of particles out of the bay is qualitatively different, with a 32 % greater escape rate of particles to the ocean in October than in July, owing to the different geometric characteristics of the flow. We show that LCSs separate regions with different transport properties by displaying spatial distributions of residence times on synoptic Lagrangian maps together with the location of the LCSs. Correlations between the time-dependent behavior of FSLE and RT are also investigated, showing a negative dependence when the stirring characterized by FSLE values moves particles in the direction of escape.

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Horizontal Lagrangian transport in a tidal-driven estuary—Transport barriers attached to prominent coastal boundaries

Cited by 51 publications

References 71 publications

Surface drifters in the German Bight: model validation considering windage and Stokes drift

Surface drifters in the German Bight: model validation considering windage and Stokes drift

A method to calculate finite-time Lyapunov exponents for inertial particles in incompressible flows

Lagrangian transport in a microtidal coastal area: the Bay of Palma, island of Mallorca, Spain

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