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Relevant bibliographies by topics / Ekman drag

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Academic literature on the topic 'Ekman drag'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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Journal articles on the topic "Ekman drag"

1

Myrhaug, Dag. "Note on geostrophic drag in the turbulent Ekman layer." Journal of Wind Engineering and Industrial Aerodynamics 45, no. 2 (1993): 215–28. http://dx.doi.org/10.1016/0167-6105(93)90271-o.

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2

Vedensky, D., and M. Ungarish. "The motion generated by a slowly rising disk in an unbounded rotating fluid for arbitrary Taylor number." Journal of Fluid Mechanics 262 (October 3, 1994): 1–26. http://dx.doi.org/10.1017/s0022112094000418.

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The motion of a disk rising steadily parallel to the axis of rotation in a uniformly rotating unbounded liquid is considered. In the limit of zero Rossby number the linear viscous equations of motion are reduced to a system of dual integral equations which renders an ‘exact’ solution for arbitrary values of the Taylor number, Ta. The investigation is focused on the drag and the flow field. In the limits of small and large Ta the asymptotic results of the present formulation agree with – and extend – previous investigations by different approaches.A particular novel feature, for large Ta, is th

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3

Fourdrinoy, Johan, Julien Dambrine, Madalina Petcu, Morgan Pierre, and Germain Rousseaux. "The dual nature of the dead-water phenomenology: Nansen versus Ekman wave-making drags." Proceedings of the National Academy of Sciences 117, no. 29 (2020): 16770–75. http://dx.doi.org/10.1073/pnas.1922584117.

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A ship encounters a higher drag in a stratified fluid compared to a homogeneous one. Grouped under the same “dead-water” vocabulary, two wave-making resistance phenomena have been historically reported. The first, the Nansen wave-making drag, generates a stationary internal wake which produces a kinematic drag with a noticeable hysteresis. The second, the Ekman wave-making drag, is characterized by velocity oscillations caused by a dynamical resistance whose origin is still unclear. The latter has been justified previously by a periodic emission of nonlinear internal waves. Here we show that t

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4

Cole, Sylvia T., Mary-Louise Timmermans, John M. Toole, Richard A. Krishfield, and Fredrik T. Thwaites. "Ekman Veering, Internal Waves, and Turbulence Observed under Arctic Sea Ice." Journal of Physical Oceanography 44, no. 5 (2014): 1306–28. http://dx.doi.org/10.1175/jpo-d-12-0191.1.

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Abstract The ice–ocean system is investigated on inertial to monthly time scales using winter 2009–10 observations from the first ice-tethered profiler (ITP) equipped with a velocity sensor (ITP-V). Fluctuations in surface winds, ice velocity, and ocean velocity at 7-m depth were correlated. Observed ocean velocity was primarily directed to the right of the ice velocity and spiraled clockwise while decaying with depth through the mixed layer. Inertial and tidal motions of the ice and in the underlying ocean were observed throughout the record. Just below the ice–ocean interface, direct estimat

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5

Mercier, M. J., R. Vasseur, and T. Dauxois. "Resurrecting dead-water phenomenon." Nonlinear Processes in Geophysics 18, no. 2 (2011): 193–208. http://dx.doi.org/10.5194/npg-18-193-2011.

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Abstract. We revisit experimental studies performed by Ekman on dead-water (Ekman, 1904) using modern techniques in order to present new insights on this peculiar phenomenon. We extend its description to more general situations such as a three-layer fluid or a linearly stratified fluid in presence of a pycnocline, showing the robustness of dead-water phenomenon. We observe large amplitude nonlinear internal waves which are coupled to the boat dynamics, and we emphasize that the modeling of the wave-induced drag requires more analysis, taking into account nonlinear effects. Dedicated to Fridtjö

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Chen, Shih-Nan, Chiou-Jiu Chen, and James A. Lerczak. "On Baroclinic Instability over Continental Shelves: Testing the Utility of Eady-Type Models." Journal of Physical Oceanography 50, no. 1 (2020): 3–33. http://dx.doi.org/10.1175/jpo-d-19-0175.1.

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AbstractThis study examines the utility of Eady-type theories as applied to understanding baroclinic instability in coastal flows where depth variations and bottom drag are important. The focus is on the effects of nongeostrophy, boundary dissipation, and bottom slope. The approach compares theoretically derived instability properties against numerical model calculations, for experiments designed to isolate the individual effects and justified to have Eady-like basic states. For the nongeostrophic effect, the theory of Stone (1966) is shown to give reasonable predictions for the most unstable

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7

Shen, Hui, William Perrie, and Yongsheng Wu. "Wind drag in oil spilled ocean surface and its impact on wind-driven circulation." Anthropocene Coasts 2, no. 1 (2019): 244–60. http://dx.doi.org/10.1139/anc-2018-0019.

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The drag coefficient is a key parameter to quantify the wind stress over the ocean surface, which depends on the ocean surface roughness. During oil spill events, oil slicks cover the ocean surface and thus change the surface roughness by suppressing multi-scale ocean surface waves, and the drag coefficient is changed. This change has not been included in the current ocean circulation models. In this study, such change in sea surface roughness is studied by satellite remote sensing via synthetic aperture radar (SAR) data to quantify the changes in the wind effect over the oil-covered ocean sur

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8

Esau, I. N. "Parameterization of a surface drag coefficient in conventionally neutral planetary boundary layer." Annales Geophysicae 22, no. 10 (2004): 3353–62. http://dx.doi.org/10.5194/angeo-22-3353-2004.

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Abstract. Modern large-scale models (LSMs) rely on surface drag coefficients to parameterize turbulent exchange between surface and the first computational level in the atmosphere. A classical parameterization in an Ekman boundary layer is rather simple. It is based on a robust concept of a layer of constant fluxes. In such a layer (log-layer), the mean velocity profile is logarithmic. It results in an universal dependence of the surface drag coefficient on a single internal non-dimensional parameter, namely the ratio of a height within this layer to a surface roughness length scale. A realist

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9

Wilchinsky, Alexander V., Daniel L. Feltham, and Paul R. Holland. "The Effect of a New Drag-Law Parameterization on Ice Shelf Water Plume Dynamics." Journal of Physical Oceanography 37, no. 7 (2007): 1778–92. http://dx.doi.org/10.1175/jpo3093.1.

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Abstract A drag law accounting for Ekman rotation adjacent to a flat, horizontal boundary is proposed for use in a plume model that is written in terms of the depth-mean velocity. The drag law contains a variable turning angle between the mean velocity and the drag imposed by the turbulent boundary layer. The effect of the variable turning angle in the drag law is studied for a plume of ice shelf water (ISW) ascending and turning beneath an Antarctic ice shelf with draft decreasing away from the grounding line. As the ISW plume ascends the sloping ice shelf–ocean boundary, it can melt the ice

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Wirth, A. "Estimation of friction parameters in gravity currents by data assimilation in a model hierarchy." Ocean Science 7, no. 2 (2011): 245–55. http://dx.doi.org/10.5194/os-7-245-2011.

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Abstract. This paper is the last in a series of three investigating the friction laws and their parametrisation in idealised gravity currents in a rotating frame. Results on the dynamics of a gravity current (Wirth, 2009) and on the estimation of friction laws by data assimilation (Wirth and Verron, 2008) are combined to estimate the friction parameters and discriminate between friction laws in non-hydrostatic numerical simulations of gravity current dynamics, using data assimilation and a reduced gravity shallow water model. I demonstrate, that friction parameters and laws in gravity currents

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Dissertations / Theses on the topic "Ekman drag"

1

Barros, Júnior Antônio de Lima 1973. "Avaliação da ocorrência de oocistos de Cryptosporidium spp. e cistos de Giardia spp. em amostras de água superficial e da interface sedimento-água do Rio Capivari, na cidade de Campinas, São Paulo, Brasil." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/317483.

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Orientadores: Regina Maura Bueno Franco, Romeu Cantusio Neto<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia<br>Made available in DSpace on 2018-08-20T10:40:41Z (GMT). No. of bitstreams: 1 BarrosJunior_AntoniodeLima_M.pdf: 1672242 bytes, checksum: 0bd26a05a56bc387ae7abcdcf5d0c478 (MD5) Previous issue date: 2011<br>Resumo: Os protozoários patogênicos gastrointestinais, Cryptosporidium spp. e Giardia spp. estão amplamente presentes em ambientes aquáticos e suas formas infectantes (oocistos e cistos), são resistentes às condições ambientais (temperatura e ra

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