The Lecture Notes in Physics Part 9 pptx

... Longuet–Higgins in [32, 33]. In this theory the ﬂow is periodic in the alongshore directionand, most importantly, the incoming wave forms a slowly varying wavetrain withconstant amplitude in the alongshore ... lasting change in the mean ﬂow. It is also clear that the net residualforcing points in the direction of p.So there is no intrinsic link between wave dissipation and mean ﬂow forcing butthere ... breaker. The wave is moving left to right and the rolling motion afterbreaking implies an organized bundle of vorticity pointing into the picture along the wave crest,spinning clockwiseoverturning...

The Lecture Notes in Physics Part 1 doc

... co-rotating reference frame The Lecture Notes in Physics The series Lecture Notes in Physics (LNP), founded in 196 9, reports new developments in physics research and teaching – quickly and informally, ... have the ﬂuid level in the innercylinder lower than outside it (see Fig. 1.6): the ‘gravitational collapse’ that takesplace after lifting the cylinder implies a radial inward motion of the ﬂuid, ... for the casedpdn< 0, with the outwardcentrifugal force being balanced by the inward pressure gradient force. The rotation can be in either direction (the sign of V is irrelevant in the...

The Lecture Notes in Physics Part 2 pps

... reveal the turbulent region during the forcing by the spinning sphere and the more smoothdensity structure soon after the forcing is stopped. Vortices produced in this way(either with the spinning ... corresponding with the densityperturbation introduced in case 1, with the resultant circulation sketched in (b). The resulting cir-culation arising in case 2, in which the centrifugal force is initially ... stratiﬁcation within the conﬁning cylinder, with a relatively sharp interfacebetween the upper and the lower layers. During the subsequent evolution of the vortex after removing the cylinder, this...

The Lecture Notes in Physics Part 3 ppsx

... vorticity, ζ, the streamlinesare hyperbolic as shown in Fig. 2.8 and the continuous stretching along the unsta-ble manifold of the stagnation point of the ﬂow induces instability. The instabilityFig. ... Neglecting the torsion, the obtained ﬂow is therefore similar to the one studied previously. Indeed, the normalto the osculating plane (so-called binormal) is precessing with respect to the z-axiswith ... vortices at the closest possible separation distance,viz. with the cylinders touching. After vertically withdrawing the cylinders the vor-tices showed an interesting behaviour, shown by the sequence...

The Lecture Notes in Physics Part 4 potx

... resulting in the formation of so-called rings or synoptic eddies. These rings, and in particular the warm-core rings which are surface intensiﬁed, have long since been identiﬁed in the vicinity ... of these rings andlead to their splitting into two or three parts [3].3 Oceanic Vortices 69 ﬂow exiting in the South Indian Ocean forms Teddies (throughﬂow eddies) and the Loop Current in the ... The main processes leading to vor-tex formation are the barotropic instability of thin jets and the baroclinic instabilityof currents separating water masses of different densities. Again in...

The Lecture Notes in Physics Part 5 ppsx

... version of these theorems was presented in Sect. 3.2.2. In the quasi-geostrophic framework, these theorems state that even in the presenceof diabatic heating and frictional or other forces, there ... g∇2h,which is the gradient wind balance presented above (further details are available in [100]). The problem of separating these two types of motions in numerical weather pre-dictions, and in particular ... t)/(2πr)Therefore, the kinetic energy of the vortex K ∼v2rdr will be ﬁnite if the areaintegral of the barotropic vorticity of the vortex is null. This can be achieved in twoways: either...

The Lecture Notes in Physics Part 6 ppt

... Oceanogr., 29, 693 ( 199 9). 64128. Pingree, R., Le Cann, B.: Three anticyclonic Slope Water Ocenic eDDIES (SWODDIES) in the southern Bay of Biscay in 199 0, Deep-Sea Res., 39, 1147 ( 199 2). 69 1 29. Pingree, ... 43, 1475 ( 199 6). 96 126. Pichevin, T., Nof, D.: The momentum imbalance paradox, Tellus, 49, 298 ( 199 7). 96 , 97 127. Pichevin, T., Nof, D., Lutjeharms, J.R.E.: Why are there. Agulhas rings? J. Phys. ... pp. 12–23( 199 9). 95 9. Bell, G.I.: Interaction between vortices and waves in a simple model of geophysical ﬂow,Phys. Fluids A, 2, 575 ( 199 0). 99 10. Bell, G.I., Pratt, L.J.: The interaction...

The Lecture Notes in Physics Part 7 pot

... ρ2h2). (4.60) The fast motions in the linear approximation are internal inertia-gravity waves prop-agating along the interface between the layers. By linearizing about the rest stateh1= ... (4 .94 a), (4 .94 b), (4 .94 c),(4 .94 d) and (4 .94 e) taken between the ﬂat top z = H and bottom z = 0. We rewritethem in the form (4.107) and introduce the deviations of the particle positions from the stationary ... 1214.3 Including Baroclinicity: 2-Layer 1.5d RSW4.3.1 Plane-Parallel Case4.3.1.1 Governing Equations and General Properties of the ModelTo introduce the baroclinic effects in the dynamics in the...

The Lecture Notes in Physics Part 8 pps

... 28, 99 9–1002 ( 199 8). 12022. Rubino, A., Dotsenko, S., Brandt, P.: Near-inertial oscillations of geophysical surface frontalcurrents. J. Phys. Oceanogr. 33, 199 0– 199 9 (2003). 11723. Sutyrin, ... consists of zonal averaging,which is the typical setup in atmospheric wave–mean interaction theory. In this peri-odic case a material line traversing the domain in the zonal x-direction qualiﬁes ... Kelvin’scirculation theorem. Speciﬁcally, the invariance of  in the second form in (5 .9) for arbitrary in nitesimally small material areas Aξimplies the material invarianceof ∇ × u dxdy. The...

The Lecture Notes in Physics Part 10 ppsx

... increases the pseudomomentumof the wavepacket, because it compresses the wavepacket in the x-direction whilststretching it in the y-direction. At the same time, the Bretherton ﬂow induced by the ... For instance, Coriolis forces were neglected throughout, but they can beincorporated both in GLM theory and in the other theoretical developments; this hasbeen done in the quoted references. The ... because the wavepacket acts and interacts with the remaining ﬂowas ifitwere a vortex couple.Moreover, if we allow the wavepacket to dissipate, then the wavepacket on the left in Fig. 5 .9 would...

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