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Showing 1 to 17 of 17 for “"Ekman layer"”.
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Experiments on Ekman layer instability.
Massachusetts Institute of Technology. Dept. of Meteorology. Thesis. 1966. Ph.D.
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Experiments in a rotating source-sink annulus
… velocities are measured over a large range of Ekman Reynolds number and Rossby number. Differing probe configurations are used to investigate the corresponding motions in spatially separated regions of the annulus. The steady interior circulation field exhibits a strong dependence on the …
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Evolution of atmospheric baroclinic waves
… baroclinic waves is investigated by a six-layer forced dissipative quasi-geostrophic $\beta$-plane channel model. In the control run, the model has: (i) a realistic zonal thermal forcing, (ii) a surface Ekman layer, a Newtonian cooling and an interior biharmonic friction as the dissipation …
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The dynamics of bottom boundary currents in the ocean
… dominate the frictional drag on the dense fluid layer in the vicinity of the source whereas relatively weak entrainment slowly modulates the flow properties in the downstream region. The combined influence of entrainment and ambient stratification help limit the descent of the Mediterranean …
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The dynamic role of ridges in a β-plane channel : towards understanding the dynamics of large scale circulation in the Southern Ocean
… in both linear homogeneous and stratified layer models in the presence of either wind stress (Chapters 2, 3, 4, and 6) or buoyancy forcing (Chapter 5). In these studies, the structure of the geostrophic contour plays a fundamental role, and the role of bottom topography is looked at from …
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A continental shelf bottom boundary layer model : the effects of waves, currents, and a movable bed
A simple model for the bottom boundary layer on the continental shelf is presented. The governing equations are developed for a stratified, turbulent Ekman layer in a combined wave and current flow over a moveable sediment bed. An eddy diffusivity closure scheme that includes the effect of …
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A Simple Numerical Model for the Study of Baroclinic Estuarine Shelf Interactions
<p>A one and a half layer nonlinear <em>f</em>-plane numerical model was used to study estuarine-shelf interactions. The single active layer covered a domain consisting of a 100 km long by 20 km wide channel discharging onto a 100 km wide by 300 km long shelf. Channel and "western” shelf boundaries …
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Shelf currents, ice and wind : a numerical modeling study
… The wind stress generates shoreward surface Ekman transport and the barotropic current generates an offshore bottom Ekman transport. In both cases, the Ekman transport causes the creation of mixed layers and a relationship describing the mixed layer thickness is derived relating the cross …
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An experimental study on mixing induced by gravity currents on a sloping bottom in a rotating fluid
… water based on the internal Froude number, the Ekman number, and the timescale of the experiments showed that diffusion was not the main mechanism for mixing. The Ekman layer solution was validated by the observation of a streak left by a grain of dye in the dense water layer. The values for the …
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Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen
… sections. The circulation is geostrophic with an Ekman layer at the surface and oceanic layers defined by neutral surfaces. Near-conservation of mass, salt and top-to-bottom silica is required and, in addition, heat and the phosphate-oxygen combination (170[P04]+[02]) are conserved in layers that …
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Prediction of continental shelf sediment transport using a theoretical model of the wave-current boundary layer
… of the Grant-Madsen-Glenn bottom boundary layer model (Grant and Madsen, 1979; Glenn and Grant, 1987) to predictions of sediment transport on the continental shelf. The analysis is a two-stage process. Via numerical experiment, we explore the sensitivity of sediment transport to variations …
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Dynamics of global ocean heat transport variability
… in which the time-varying wind drives Ekman layer mass transports that are compensated by depth-independent return flows. The temperature difference between the mass transports gives rise to the time-dependent heat transport. The rectified eddy heat transport is calculated from the …
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Dynamics of global ocean heat transport variability
… in which the time-varying wind drives Ekman layer mass transports that are compensated by depth-independent return flows. The temperature difference between the mass transports gives rise to the time-dependent heat transport. The rectified eddy heat transport is calculated from the …
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An experimental study on mixing induced by gravity currents on a sloping bottom in a rotating fluid
… water based on the internal Froude number, the Ekman number, and the timescale of the experiments showed that diffusion was not the main mechanism for mixing. The Ekman layer solution was validated by the observation of a streak left by a grain of dye in the dense water layer. The values for the …
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Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen
… sections. The circulation is geostrophic with an Ekman layer at the surface and oceanic layers defined by neutral surfaces. Near-conservation of mass, salt and top-to-bottom silica is required and, in addition, heat and the phosphate-oxygen combination (170[PO 4]+[0 2]) are conserved in layers …
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Prediction of continental shelf sediment transport using a theoretical model of the wave-current boundary layer
… of the Grant-Madsen-Glenn bottom boundary layer model (Grant and Madsen, 1979; Glenn and Grant, 1987) to predictions of sediment transport on the continental shelf. The analysis is a two-stage process. Via numerical experiment, we explore the sensitivity of sediment transport to variations …
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Observations and Modeling Forcing Mechanisms for the Coastal Dynamics of the Upper Gulf of Thailand
… with ∼1 km horizontal grid and 21 vertical layers has been used to study the influence of wind stresses, river discharges, surface heat fluxes and tides on the three-dimensional circulation of the upper Gulf of Thailand (UGOT). Analysis of observations, including sea level data, provided …