摘要:

A scaled-up Reynolds model of a sediment particle on a streambed has been used to study the drag force exerted by streamflow. The results have been presented as a data trend relating particle drag coefficient to particle Reynolds number. The modified drag coefficient and Reynolds number used take into account the presence of bounded shear flow by using a characteristic velocity determined from the relation between the approach flow velocity and the shear velocity on the streambed.

ISSN:0022-1686    

DOI:10.1080/00221687909499589

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Velocity measurements close to a smooth bed have been made downstream of a range of rearwardfacing steps. When the step height is greater than the thickness of the viscous sublayer, the effect of the step on velocities close to the bed is large and is apparent for 30 step heights and more in the downstream direction. The ratiotends toward a constant value, however, within about 10 step heights. Large fluctuations in the instantaneous length of the separation bubble occur. The extent to which the instantaneous shear stress would exceed the critical shear stress for initial movement of a given sand is relevant to the formation and propagation of ripples.

ISSN:0022-1686    

DOI:10.1080/00221687909499590

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The hydraulics of alluvial streams and sediment transport in alluvial channels is not yet well understood and consequently poorly described. In particular the topic of flow resistance has received much attention [1, 2, 3, 7, 9, 13] but as yet there has been no general equation relating friction to average flow velocity. Equations developed on the basis of rigid boundary fluid mechanics do not adequately describe the more complex behavior of alluvial channels. This paper discusses the relationship of flow resistance to average flow velocity based on the author's study of the Raba River in Poland. Experimental results are compared with EINSTEIN-BARBAROSSA, RAUDKIVI and MANNING methods.

ISSN:0022-1686    

DOI:10.1080/00221687909499591

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The effects of the shape of the cross-section on flow resistance in open channels has received considerable attention from hydraulic engineers for many years. Many investigators have tried to introduce parameters to represent the cross-section shape effect but their results have been inconclusive. Some of the techniques previously used to deal with this problem are reviewed and their shortcomings are discussed. A new method for dealing with shape effect is developed in this paper from considerations of dimensional analysis and using the experimental data of TRACY and LESTER and of SHIH and GRIGG. This method, which is referred to as KAZEMIPOUR'S method, employs new parameters more representative of the effect of cross-sectional shape on flow resistance in open channels than those previously used and offers solutions more rational than those previously proposed.

ISSN:0022-1686    

DOI:10.1080/00221687909499592

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Calculation of steady-state pressure and flow distributions in a water network is an important requirement for network operators and planners. The SWAN model described in this report is suitable for simulation of networks comprising pipes, non-return and pressure-reducing valves, pumps and storage tanks or reservoirs.

ISSN:0022-1686    

DOI:10.1080/00221687909499593

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

COASTAL ENGINEERING - AN INTRODUCTION TO OCEAN ENGINEERINGby K.IYOSHI HORIKAWA, Published by Prentice-Hall International, 66 Wood Lane End, Hemel Hempstead, Herts. HP 2 4RG, England. Price £ 27.00.

ISSN:0022-1686    

DOI:10.1080/00221687909499594

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221687909499588

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor