摘要:

The devices employed for the measurement of discharges in free surface channels usually generate a great headloss, incompatible with irrigation purposes in flat areas. To solve this problem, the author presents a new type of flowmeter which combines the advantages of the triangular weir and those of the Parshall weir.

ISSN:0022-1686    

DOI:10.1080/00221688909499181

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Mean and fluctuating pressures on various geometries of vertical-lift gates have been measured and analysed. The influence of various hydraulic parameters and the magnitude of the gate opening on mean and r.m.s. pressure fluctuations and their spatial correlations has been investigated. The variations in the distribution pattern, spatial correlations and intensity of pressure fluctuations have been studied when the gate is forced to vibrate with a single degree-of-freedom in the vertical direction at specified frequencies and amplitude. Total intensity of fluctuating pressures on vibrating gates has been obtained by integrating the r.m.s. pressure fluctuations over the gate thickness. The distinct peak in the total intensity of fluctuating pressure on the gate indicates the presence of a dominant frequency which is considered to be the critical condition for the design of hydraulic control gates.

ISSN:0022-1686    

DOI:10.1080/00221688909499182

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The main features of the highly anisotropic turbulence in the region of vanishing shear near the free surface of two-dimensional channel flow have been calculated using a Reynolds-stress transport model with surfaceeffect terms in the pressure-strain-rate correlation. The form of these terms is identical for solid and free surfaces. For a free surface, however, the surface-proximity function is an order of magnitude greater than the function for a rigid surface.

ISSN:0022-1686    

DOI:10.1080/00221688909499183

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The Bagnold's energy concept for sediment transport is used to estimate the volume of sediment mobilized by strong wave action. The results are compared with wave tunnel data for sheet flow conditions and with bed load formulae by Sleath and by Madsen and Grant. The predictions differ excessively and agreement with wave tunnel data is poor. The results indicate that only a small percentage ofthe energy dissipation at the bed is due to the sediment in motion.

ISSN:0022-1686    

DOI:10.1080/00221688909499184

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The occurrence of a submerged hydraulic jump in a low head canal regulating structure with piers is considered. The problem is three-dimensional because of the abrupt lateral expansion at the end of the piers. The jump dynamics is affected by this expansion, and this effect should be taken into account in calculating the hydraulics for the structure.

ISSN:0022-1686    

DOI:10.1080/00221688909499185

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The non-linear viscous oscillatory flow over a wavy wall of small amplitude ε*is determined. The solution holds for arbitrary values ofa*/L*(a*is the amplitude of fluid oscillations near the wall andL*is the wavelength of wall perturbation); previous works of Lyne [1], Kaneko and Honji [2] on the subject are thus extended.

ISSN:0022-1686    

DOI:10.1080/00221688909499186

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221688909499187

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Hydraulic EngineeringBy John A. Robertson, John J. Cassidy and M. Hanif Chaudhry Houghton Mifflin Company, One Beacon Street, Boston, Massachusetts 02108, U.S.A., 1988. Hardcover, 308 figures, 39 tables, 662 pages, ISBN 0-395-38123-1.

ISSN:0022-1686    

DOI:10.1080/00221688909499188

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221688909499180

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor