Arid
DOI10.1016/j.ijsrc.2017.06.002
Bed roughness and grain sorting- an experimental study over fine to medium sand beds
Purkait, Barendra1,5; Das Majumdar, Dipanjan2,3; Mazumder, Rajat4,6
通讯作者Purkait, Barendra
来源期刊INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
ISSN1001-6279
出版年2017
卷号32期号:3页码:384-400
英文摘要

The relation between grain-size distribution of the bed and in suspension was critically examined under a uniform flow velocity of 50 cm/s over two beds: one of mainly fine sands and the other of medium sands. Two sections - one 2.85 m downstream and the other 6.35 m downstream in the experimental channel - were selected for sampling to study the grain-sorting pattern in the vertical direction along the direction of transport. The shape and type of the grain-size distribution pattern were critically studied with height above the bed. The change in the distribution pattern has been attributed to the change of local bed roughness causing scouring against the protruded relatively coarse grains on the bed. Such trends are important to predict the nature of river bed topography. The sand of Bed-1 initially exhibits a log-skew-Laplace distribution at different heights of suspension. The distribution pattern, however, changes but this changing pattern is not consistent along the upstream side. For Bed-2, which initially exhibits a log-normal distribution, the same pattern persists from the height of suspension at 5 cm up to 20 cm. Such consistency in log-normality is also observed at the downstream points of measurement. It is generally expected that the mean grain-size would reduce with increases of suspension height but the results of the experiments, in some occasions, differ significantly from the gradual fining upward trend. This result has been attributed to local changes of bed roughness arising from the protruded relatively coarse grains causing eddies, scouring, and turbulent phenomena which moves coarse particles higher in suspension adding a coarse tail to the distribution increasing the mean grain-size. (C) 2017 International Research and Training Centre on Erosion and Sedimentation/the World Association for Sedimentation and Erosion Research. Published by Elsevier B.V. All rights reserved.


英文关键词Flume experiments Suspension height Uniform flow velocity Bed roughness Grain-size distribution Bed scouring Turbulent flow
类型Article
语种英语
国家India ; Australia ; Malaysia
收录类别SCI-E
WOS记录号WOS:000412755500010
WOS关键词PARTICLE-SIZE DISTRIBUTION ; GRAVEL-BED ; DISTRIBUTION PATTERNS ; COASTAL DUNES ; SUSPENSION ; SEDIMENT ; CHANNEL ; DISTRIBUTIONS ; TRANSPORT ; DESERT
WOS类目Environmental Sciences ; Water Resources
WOS研究方向Environmental Sciences & Ecology ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/199821
作者单位1.Indian Stat Inst, Geol Studies Unit, 203,BT Rd, Kolkata 700035, India;
2.Vidyasagar Univ, Dept Remote Sensing, Midnapore 721102, W Bengal, India;
3.Vidyasagar Univ, GIS, Midnapore 721102, W Bengal, India;
4.Univ New South Wales, Sch Biol Earth & Environm Sci, Sydney, NSW 2052, Australia;
5.Univ Calcutta, Dept Geol, 35,Ballygunge Circular Rd, Kolkata 700019, India;
6.Curtin Univ Malaysia, Dept Appl Geol, Fac Engn & Sci, Miri 98009, Malaysia
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GB/T 7714
Purkait, Barendra,Das Majumdar, Dipanjan,Mazumder, Rajat. Bed roughness and grain sorting- an experimental study over fine to medium sand beds[J],2017,32(3):384-400.
APA Purkait, Barendra,Das Majumdar, Dipanjan,&Mazumder, Rajat.(2017).Bed roughness and grain sorting- an experimental study over fine to medium sand beds.INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH,32(3),384-400.
MLA Purkait, Barendra,et al."Bed roughness and grain sorting- an experimental study over fine to medium sand beds".INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH 32.3(2017):384-400.
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