Academic literature on the topic 'Drifting speed of Lagrangian fronts'

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Journal articles on the topic "Drifting speed of Lagrangian fronts"

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Fifani, Gina, Alberto Baudena, Milad Fakhri, et al. "Drifting Speed of Lagrangian Fronts and Oil Spill Dispersal at the Ocean Surface." Remote Sensing 13, no. 22 (2021): 4499. http://dx.doi.org/10.3390/rs13224499.

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Due to its dire impacts on marine life, public health, and socio-economic services, oil spills require an immediate response. Effective action starts with good knowledge of the ocean dynamics and circulation, from which Lagrangian methods derive key information on the dispersal pathways present in the contaminated region. However, precise assessments of the capacity of Lagrangian methods in real contamination cases remain rare and limited to large slicks spanning several hundreds of km. Here we address this knowledge gap and consider two medium-scale (tens of km wide) events of oil in contrast
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Heron, Mal, Roberto Gomez, Bernd Weber, et al. "Application of HF Radar in Hazard Management." International Journal of Antennas and Propagation 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/4725407.

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A review is given of the impact that HF radars are having on the management of coastal hazards. Maps of surface currents can be produced every 10–20 minutes which, in real time, improve navigation safety in restricted areas commonly found near ports and harbours. The time sequence of surface current maps enables Lagrangian tracking of small parcels of surface water, which enables hazard mitigation in managing suspended sediments in dredging, in emergency situations where flotsam and other drifting items need to be found, and in pollution control. The surface current measurement capability is u
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Nemoto, Masaki, Kouichi Nishimura, Syunichi Kobayashi, and Kaoru Izumi. "Numerical study of the time development of drifting snow and its relation to the spatial development." Annals of Glaciology 38 (2004): 343–50. http://dx.doi.org/10.3189/172756404781815202.

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AbstractThe time evolution of drifting snow under a steady wind is estimated using a new numerical model of drifting snow. In the model, Lagrangian stochastic theory is used to incorporate the effect of turbulence on the motion of drifting-snow particles. This method enables us to discuss both the saltation and the suspension process. Aerodynamic entrainment, grain/bed collision (splash process), wind modification and particle size distribution are also taken into account. The calculations show that the time needed by the total mass flux to reach a steady state appears to be 3–5 s. Vertical pr
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Wang, Dié, Emily C. Melvin, Noah Smith, et al. "TRACER Perspectives on Gulf-Breeze and Bay-Breeze Circulations and Coastal Convection." Monthly Weather Review 152, no. 10 (2024): 2207–28. http://dx.doi.org/10.1175/mwr-d-23-0292.1.

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Abstract This study explores gulf-breeze circulations (GBCs) and bay-breeze circulations (BBCs) in Houston–Galveston, investigating their characteristics, large-scale weather influences, and impacts on surface properties, boundary layer updrafts, and convective clouds. The results are derived from a combination of datasets, including satellite observations, ground-based measurements, and reanalysis datasets, using machine learning, changepoint detection method, and Lagrangian cell tracking. We find that anticyclonic synoptic patterns during the summer months (June–September) favor GBC/BBC form
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Lee, Daniel, Amandine Schaeffer, and Sjoerd Groeskamp. "Drifting dynamics of the bluebottle (<i>Physalia physalis</i>)." Ocean Science 17, no. 5 (2021): 1341–51. http://dx.doi.org/10.5194/os-17-1341-2021.

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Abstract. Physalia physalis, also called the bluebottle in Australia, is a colonial animal resembling a jellyfish that is well known to beachgoers for the painful stings delivered by its tentacles. Despite being a common occurrence, the origin of the bluebottle before reaching the coastline is not well understood, and neither is the way it drifts at the surface of the ocean. Previous studies used numerical models in combination with simple assumptions to calculate the drift of this species, excluding complex drifting dynamics. In this study, we provide a new parameterization for Lagrangian mod
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Poulain, Pierre-Marie, Luca Centurioni, and Tamay Özgökmen. "Comparing the Currents Measured by CARTHE, CODE and SVP Drifters as a Function of Wind and Wave Conditions in the Southwestern Mediterranean Sea." Sensors 22, no. 1 (2022): 353. http://dx.doi.org/10.3390/s22010353.

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Instruments drifting at the ocean surface are quasi-Lagrangian, that is, they do not follow exactly the near-surface ocean currents. The currents measured by three commonly-used drifters (CARTHE, CODE and SVP) are compared in a wide range of sea state conditions (winds up to 17 m/s and significant wave height up to 3 m). Nearly collocated and simultaneous drifter measurements in the southwestern Mediterranean reveal that the CARTHE and CODE drifters measure the currents in the first meter below the surface in approximately the same way. When compared to SVP drogued at 15 m nominal depth, the C
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Wang, Tianyu, Yan Du, and Minyang Wang. "Overlooked Current Estimation Biases Arising from the Lagrangian Argo Trajectory Derivation Method." Journal of Physical Oceanography 52, no. 1 (2022): 3–19. http://dx.doi.org/10.1175/jpo-d-20-0287.1.

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Abstract An Argo simulation system is used to provide synthetic Lagrangian trajectories based on the Estimating the Circulation and Climate of the Ocean Model, phase II (ECCO2). In combination with ambient Eulerian velocity at the reference layer (1000 m) from the model, quantitative metrics of the Lagrangian trajectory–derived velocities are computed. The result indicates that the biases induced by the derivation algorithm are strongly linked with ocean dynamics. In low latitudes, Ekman currents and vertically sheared geostrophic currents influence both the magnitude and the direction of the
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Ochoa, José, and Peter P. Niiler. "Vertical Vorticity Balance in Meanders Downstream the Agulhas Retroflection." Journal of Physical Oceanography 37, no. 6 (2007): 1740–44. http://dx.doi.org/10.1175/jpo3064.1.

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Abstract The Agulhas Current flows poleward along the western boundary of the southeastern Indian Ocean where, at the southernmost latitude of the African continent, it executes a dramatic anticyclonic turn, or retroflection, to the east. Since 1978, a large number of drifting buoys have passed through this eastward-flowing Agulhas Return Current (ARC), or the zonal frontal boundary between subtropical and subpolar waters of the south Indian Ocean. The spatial distribution of the ensemble-averaged near-surface velocity along the ARC axis reveals a series of steady-state meanders of 700-km wave
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Romero, Leonel, J. Carter Ohlmann, Enric Pallàs-Sanz, Nicholas M. Statom, Paula Pérez-Brunius, and Stéphane Maritorena. "Coincident Observations of Dye and Drifter Relative Dispersion over the Inner Shelf." Journal of Physical Oceanography 49, no. 9 (2019): 2447–68. http://dx.doi.org/10.1175/jpo-d-19-0056.1.

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AbstractCoincident Lagrangian observations of coastal circulation with surface drifters and dye tracer were collected to better understand small-scale physical processes controlling transport and dispersion over the inner shelf in the Gulf of Mexico. Patches of rhodamine dye and clusters of surface drifters at scales of O(100) m were deployed in a cross-shelf array within 12 km from the coast and tracked for up to 5 h with airborne and in situ observations. The airborne remote sensing system includes a hyperspectral sensor to track the evolution of dye patches and a lidar to measure directiona
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Pingree, R. D., and Linda Maddock. "Stokes, Euler and Lagrange Aspects of Residual Tidal Transports in the English Channel and the Southern Bight of the North Sea." Journal of the Marine Biological Association of the United Kingdom 65, no. 4 (1985): 969–82. http://dx.doi.org/10.1017/s0025315400019445.

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INTRODUCTIONThe dust cart on the Isles of Scilly did not end its service at the local tip, over the cliffs at Deep Point on the eastern side of St Mary's on 14 October 1983. Instead it floated off and continued in service as a Lagrangian drifter, indicating the residual transport of water around the islands. As a hazard to shipping its position was given out as a navigation warning and it was allegedly sighted on the western side of Scilly. The interesting oceanographic question is whether the dust cart was (or would have had it not sunk) circumnavigating the islands in a clockwise or anticloc
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Dissertations / Theses on the topic "Drifting speed of Lagrangian fronts"

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Fifani, Gina. "Lagrangian dispersion and oil spills : with a case study in the Eastern Mediterranean." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS243.

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Les déversements d'hydrocarbures nécessitent une intervention immédiate qui commence par une bonne connaissance de la dynamique océanique de la région contaminée. L'approche Lagrangienne a été proposée comme un outil soutenant la gestion de la pollution marine. L'objectif de cette thèse est d'utiliser et développer des outils lagrangiens pour analyser deux événements de marée noire s'étendant sur une échelle plus petite que celle de la marée noire de DeepWater Horizon: une marée noire offshore en mer de Chine orientale (2018) et un accident côtier dans la Méditerranée orientale (2021). Le calc
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Conference papers on the topic "Drifting speed of Lagrangian fronts"

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Storie, Jill, Rafael Ramos, Michael Leber, Heather Nowak, Michelle Young, and Bruce Magnell. "Evaluation of Loop Current/Loop Current Eddy Fronts to Guide Offshore Oil & Gas Operations." In Offshore Technology Conference. OTC, 2023. http://dx.doi.org/10.4043/32643-ms.

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Abstract The unique circulation characteristics of the Gulf of Mexico (GOM) pose a significant threat to the safety of offshore oil and gas operations pertaining to installation of new production systems, drilling, and maintenance of existing offshore infrastructure. Operators in the area rely on realistic estimates of the location of the sharp fronts (regions of high horizontal shear) characteristic of the warm-core Loop Current (LC) and Loop Current Eddies (LCEs) and smaller cold core cyclonic eddies (CEs) to estimate working windows. However, locating these features is not a trivial underta
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