摘要:

A depth-dependent model for the topographic rectification of tidal currents in a homogeneous rotating fluid is used to examine the dependence of the rectified mean flow on various tidal, topographic and frictional parameters. Friction is parameterized through a vertically-uniform, time-independent vertical eddy viscosity and a bottom stress law applied near the top of the constant stress layer. The model neglects the interaction of mean and tidal currents, assumes uniformity along isobaths, and is closed with the assumption of zero depth-averaged mean flow across isobaths.

ISSN:0309-1929    

DOI:10.1080/03091928508219269

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

A simple model is developed of a double-diffusive gravity current flowing without friction on a horizontal surface. This model captures the effect of the increase in density difference between the gravity current and the environment which is caused by the double-diffusive convection. The double-diffusive flux of buoyancy into the flowing current decreases with time (i.e. with distance from the source) and eventually approaches zero. Steady solutions can then be found which are a function only of distance down-stream from the source. Conservation of momentum shows that entrainment of fluid into the density current is necessary in order to match the imposed condition of a fixed Richardson number at the nose to the arbitrary boundary conditions at the source. When double-diffusive convection and entrainment are both parameterizeda priori, the model is overconstrained in the sense that the downstream Richardson number condition at the nose can be satisfied only by a particular set of inlet conditions. This leads us to the conclusion that entrainment and double-diffusive convection must not act independently of each other, but that the presence of the entrainment process must reduce the effectiveness of double-diffusive convection.

ISSN:0309-1929    

DOI:10.1080/03091928508219270

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Experimental results are presented on the characteristics and occurrence of amplitude vacillation observed in the regular wave regime of a differentially heated rotating fluid annulus. The amplitude vacillation appears as the periodic oscillation of the amplitude and frequency of the dominant wave component and its harmonics and occurs, in general, adjacent to a transition to the next lowest wavenumber. The frequency spectra of the amplitude vacillations are characterized by the presence of two distinct frequencies, one from the vacillation and one from the drift of the wave; in general the amplitude vacillations observed can be said to be doubly periodic. The wave interference mechanism of amplitude vacillation is examined but no evidence was found which could be unambiguously interpreted in its favour.

ISSN:0309-1929    

DOI:10.1080/03091928508219271

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

In this paper we study analytically the simplest fluid mechanical model which can mimic the convective behavior which is thought to occur in the solid mantles of the terrestrial planets. The convecting materials are polycrystalline rocks, whose creep behavior depends very strongly on temperature and probably also on pressure. As a simple model of this situation, we consider the flow of a Newtonian viscous fluid, whose viscosity depends strongly on temperature (only), and in fact has an infinite viscosity below a certain temperature, and a constant viscosity above this temperature. This model would also be directly relevant to the convection of a melt beneath its own solid phase (e.g. water below ice, though in that case there are other physical complications).

ISSN:0309-1929    

DOI:10.1080/03091928508219272

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

The work of Drobyshevski and Yuferev (1974) and Arter (1983b) is continued and extended. Magnetic flux distributions are calculated for Rayleigh-Bknard convection with square planform. The importance of the local structure of the flow-field near stagnation points is emphasised. When the Lorentz force is included motion often takes the form of rolls, but if three-dimensional flow persists the field distribution is essentially kinematic. Implications for dynamo and sunspot theories are discussed. These calculations do not support the use of the flux-tube as conceived by Parker (1979) to model horizontal magnetic field, although this may be due to their idealized nature.

ISSN:0309-1929    

DOI:10.1080/03091928508219273

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

By Adrian E. Gill. international geophysics series, volume 30. Academic Press, x + 662 pp. £40.60, £20.80 (pbk), (ISBN 0 12 283522 4) 1982.

ISSN:0309-1929    

DOI:10.1080/03091928508219274

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

By R. Peyret and T. D. Taylor, Springer-Verlag, New York, 358pp. $36.80 (ISBN 0 387 11 147 6), 1983.

ISSN:0309-1929    

DOI:10.1080/03091928508219275

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

The earth's climate: Past and future by M. I. Budyko. international geophysics series, Vol. 29, Academic Press, New York, London, x+307pp. £26.20, $39.50 (ISBN 0 12 139460 3) 1982.

ISSN:0309-1929    

DOI:10.1080/03091928508219276

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

By B. J. T. Jones and J. E. Jones (Editors), D. Reidel, x + 358 pp. Dfl. 125, US$ 54.50 (ISBN 90 277 1507 6) 1983.

ISSN:0309-1929    

DOI:10.1080/03091928508219277

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor