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Water 2017, 9(9), 668; https://doi.org/10.3390/w9090668

Velocity Distribution and 3D Turbulence Characteristic Analysis for Flow over Water-Worked Rough Bed

1,2
,
2,3,4
and
2,3,*
1
School of Engineering, Faculty of Engineering and Informatics, University of Bradford, Bradford DB7 1DP, UK
2
State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
3
State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China
4
School of Water Resources and Electric Power, Qinghai University, Xining 810016, China
*
Author to whom correspondence should be addressed.
Received: 31 July 2017 / Revised: 31 August 2017 / Accepted: 1 September 2017 / Published: 8 September 2017
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Abstract

To reproduce the natural flow topography in a laboratory environment, it is crucial to recapture its bed condition in order to ensure the accurate representation. Water-worked bed represents a state-of-the-art experimentally formed bed to imitate the natural-formed channel in most rivers or natural streams. Recently, this technique has been intensively studied through experimental and computational approaches; however, its actual influence towards the near-bed flow as compared to experimentally prepared rough bed in well-packed bedform order are still yet to be investigated deeply. This experimental study systematically investigated and compared the differences in velocity distribution and three-dimensional (3D) turbulence characteristics, including turbulence intensities and Reynolds stresses, between uniform smooth bed, laboratory-prepared rough bed and water-worked bed open channel flows. The flow comparisons were concentrated at near-bed region where clear flow behaviour change can be observed. Through these comparisons, the study inspected the characteristics of water-worked bedform thoroughly, in order to inform future experimental research that tries to reproduce natural stream behaviours. View Full-Text
Keywords: smooth bed; rough bed; water-worked bed; near-bed flow; uniform flow; velocity distribution; turbulence intensity; Reynolds stress; 3D turbulence characteristics smooth bed; rough bed; water-worked bed; near-bed flow; uniform flow; velocity distribution; turbulence intensity; Reynolds stress; 3D turbulence characteristics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Pu, J.H.; Wei, J.; Huang, Y. Velocity Distribution and 3D Turbulence Characteristic Analysis for Flow over Water-Worked Rough Bed. Water 2017, 9, 668.

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