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DOI | 10.1016/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
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ISSN | 1001-6279 |
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 |
推荐引用方式 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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