摘要:

It is common to separate the sediment transport of rivers into bed load, wash load and suspended load. The problem is that there are no unique criteria for distinguishing between the three types of loads. Using the concept of coherent structures for turbulent flow, it is shown here that only the shear events (burst phenomena) are able to transport the larger grain sizezs of the sediment. Together with Shen's distinction between material found on the bed and fractions not found on the bed, one obtains a consistent set of criteria for defining the three types of loads.

ISSN:0022-1686    

DOI:10.1080/00221688309499446

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

This device transforms a rectilinear flow into a rotating flow without using impellers or other mechanical implements. Its working principles and applications to mixing, aeration and clarification processes are described and analysed.

ISSN:0022-1686    

DOI:10.1080/00221688309499447

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Laboratory experiments lead to a way of modifying two existing transport rate formulae so that transport rates and size distributions of transported material can be predicted knowing the hydraulic conditions and the bed-material grain size distribution. The Ackers and White and the Paintal transport formulae are modified accordingly and used successfully on laboratory data. Difficulties in defining bed-material distributions and the possibility of overpassing in sand/gravel systems are reflected in the results obtained using data from four rivers.

ISSN:0022-1686    

DOI:10.1080/00221688309499448

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221688309499449

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Experimental researeli on flow over permeable surfaces is reported, in which flow over a permeable, rough surface is compared with flow over non-permeable, rough and smooth surfaces. The experiments were conducted in a wind tunnel using two permeable surfaces (Fig. 4) of relative thicknesses D/de= 2,73 and 9,67.

ISSN:0022-1686    

DOI:10.1080/00221688309499450

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

WATER HAMMER. PROBLEMS AND SOLUTIONSby B.B. SHARP Edward Arnold Publishers Ltd. 41 Bedford Square, London WC1B 3DQ, England. 144 pp, 96 figures, 3 tables, 13 Fortran programs. Price £11.75 net. Binding: Boards.

ISSN:0022-1686    

DOI:10.1080/00221688309499451

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221688309499452

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221688309499453

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221688309499445

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor