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Open AccessArticle

On the Morphodynamic Alterations around Bridge Piers under the Influence of Instream Mining

1
Department of Civil Engineering, Indian Institute of Technology, Guwahati 781039, India
2
Department of Civil and Environmental Engineering, Indian Institute of Technology Patna, Bihar 801103, India
3
School of Engineering, University of Basilicata, Viale dell’Ateneo Lucano, 10, 85100 Potenza, Italy
*
Author to whom correspondence should be addressed.
Water 2019, 11(8), 1676; https://doi.org/10.3390/w11081676
Received: 27 June 2019 / Revised: 5 August 2019 / Accepted: 9 August 2019 / Published: 13 August 2019
(This article belongs to the Special Issue Bridge Hydraulics: Current State of the Knowledge and Perspectives)
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Abstract

Sand mining in an active alluvial channel can compromise the streambed stability of the hydraulic structures nearby. This experimental study is aimed at investigating the effects of rectangular mining pit on the morphodynamics around circular tandem piers in a movable bed. A rectangular pit is excavated upstream of two circular piers embedded in the sand-bed in a tandem arrangement. The results are then compared to a case having only the piers without any mining pit. Turbulent stresses and mean velocities in the near-bed region rise significantly at the upstream region of the piers in the presence of a pit. Also, stronger flow reversal and horseshoe vortices have been detected at the base of the pier front. Due to these alterations in the nature of turbulence, erosion of channel beds upstream of the piers, increased scour depths, scour volume, and lateral erosion of the scour hole have been observed. Dynamic evolution of the local scour at various time scales has been studied using a wavelet cross-correlation method. Spatial evolution of local scour is found to be faster when a pit is excavated in the channel. Thus, mining activities near the piers can lead to significant changes in the flow-field, causing excessive scour around piers. View Full-Text
Keywords: sediment mining; local scour; turbulent stresses; wavelet analysis sediment mining; local scour; turbulent stresses; wavelet analysis
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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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Lade, A.D.; Deshpande, V.; Kumar, B.; Oliveto, G. On the Morphodynamic Alterations around Bridge Piers under the Influence of Instream Mining. Water 2019, 11, 1676.

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