摘要:

This paper elaborates upon the reasons why subcritical stratified flows may be treated as two-layer flows without mixing. In addition it gives a summary of experimental data on the interfacial shear.

ISSN:0022-1686    

DOI:10.1080/00221687909499572

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Previous works of Moore, White, and Rand on the characteristics of the free overfall drop structures are briefly reviewed. A simple theory initially proposed by White is modified by introducing lesser drastic assumptions than the ones on which White's theory is based. The resulting theory is in closer agreement with experiment and the empirical equations of Rand than White's theory. Experimental results are also given on the brink depth as an appendix.

ISSN:0022-1686    

DOI:10.1080/00221687909499573

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Measurements are described of the fluid velocities close to a rough bed oscillating in its own plane in a chamber with superimposed mean drift. The measurements were made in air with a hot-wire anemometer. It was found that over a wide range of conditions the common assumption that the combined flow may be treated as the vector sum of the steady and oscillatory flows separately is incorrect. In all cases investigated, the drift near the bed was less than that which would have been expected in the absence of non-linear interaction between the oscillatory and steady flows. For certain conditions the drift near the bed was actually in the opposite direction to that of the superimposed flow.

ISSN:0022-1686    

DOI:10.1080/00221687909499574

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The motion of injected air bubbles of equivalent diameters between 0.98 mm to 6.25 mm were experimentally studied using photographic recordings. The theoretical analysis formulated for this study showed that the relative velocity of the air bubles approached a state similar to the terminal velocity in still water shortly after being subjected to acceleration. Experimental results conclusively proved the theoretical approach and formulae were therefore developed to express these experimental findings, in accordance with the theoretical and statistical approaches.

ISSN:0022-1686    

DOI:10.1080/00221687909499575

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

This paper describes the use of mean turbulence energy closure models for the calculation of the vertical structure of the width-averaged flow due to the propagation of long waves in an open channel of constant width and rectangular cross-section. Two turbulence models were considered which required the solution of one or both of the differential equations governing the turbulence energy and its dissipation rate. Numerical solutions were obtained for the motion induced by long waves in a laboratory channel and in the Humber Estuary. The computed values of surface velocity and bed shear stress in the laboratory channel were found to agree well with observed values. The calculation procedure also accurately reproduced the vertical structure of the tidal flow in the Humber Estuary. Existing theoretical relationships for the bed shear stress under long waves were verified by the numerical calculations and a distribution of the dissipation length scale, postulated on physical grounds, was also confirmed. It was concluded that turbulence models of this type represent powerful research tools for the study of long waves, especially those which occur in nature.

ISSN:0022-1686    

DOI:10.1080/00221687909499576

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Experience is described of a 41 m wide by 308 m long, open channel on a 0.052 slope, constructed of loose boulders and through which flows up to 140 m3/s are passed. A new expression for the Darcy friction coefficient is proposed:

ISSN:0022-1686    

DOI:10.1080/00221687909499577

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

HYDROMETRYPrinciples and Practices by R. W. HERSCHY, Edited by John Wiley and Sons, Baffins Lane, Chichester, Sussex, England, 511 pages

ISSN:0022-1686    

DOI:10.1080/00221687909499578

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221687909499579

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221687909499580

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221687909499571

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor