Alluvial channel hydrodynamics around tandem piers with downward seepage

doi:10.1007/s11709-020-0648-x

Front. Struct. Civ. Eng.

2020, Vol. 14

Issue (6) : 1445-1461 https://doi.org/10.1007/s11709-020-0648-x

RESEARCH ARTICLE

Alluvial channel hydrodynamics around tandem piers with downward seepage

Rutuja CHAVAN¹, Wenxin HUAI², Bimlesh KUMAR³(

)

¹. Department of Civil Engineering, Maulana Azad National Institute of Technology Bhopal, Bhopal, Madhya Pradesh 462003, India
². Department of Harbor, School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430072, China
³. Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India

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Abstract

In this paper, we report the turbulent flow structures and the scour geometry around two piers with different diameters. An experiment was conducted on a non-uniform sand bed with two types of tandem arrangements, namely, pier (T1) with a 75 mm front and 90 mm rear, and pier (T2) with a 90 mm front and 75 mm rear, with and without-seepage flows, respectively. A strong wake region was observed behind the piers, but the vortex strength diminished with downward seepage. Streamwise velocity was found to be maximum near the bed downstream of the piers and at the edge of the scour hole upstream of the piers. Quadrant analysis was used to recognize the susceptible region for sediment entrainment and deposition. Upstream of the piers near the bed, the moments, turbulent kinetic energy (TKE), and TKE fluxes were found to decrease with downward seepage, in contrast to those in a plane mobile bed without piers. The reduction percentages of scour depth at the rear pier compared with the front one were approximately 40% for T1 and 60% for T2. Downward seepage also resulted in restrained growth of scouring with time.

Keywords scour seepage Strouhal number tandem arrangement turbulent characteristics

Corresponding Author(s): Bimlesh KUMAR

Just Accepted Date: 30 September 2020 Online First Date: 07 December 2020 Issue Date: 12 January 2021

Cite this article:

Rutuja CHAVAN,Wenxin HUAI,Bimlesh KUMAR. Alluvial channel hydrodynamics around tandem piers with downward seepage[J]. Front. Struct. Civ. Eng., 2020, 14(6): 1445-1461.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-020-0648-x
https://academic.hep.com.cn/fsce/EN/Y2020/V14/I6/1445

Fig.1 Schematic diagram of experimental setup.

Fig.2 Particle size distribution of sediment mixtures.

Fig.3 Snapshot of scoured bed after experimental run.

Tab.1 Details of the experimental conditions

Fig.4 Velocity power spectra with Kolmogorov’s-5/3 law. (a) Unfiltered; (b) filtered.

Fig.5 Velocity profiles at (a) upstream A, (b) Section B, (c) downstream C of piers.

Fig.6 RSS profiles at (a) upstream A, (b) Section B, (c) downstream C of piers.

Fig.7 Turbulent intensity profiles at (a) upstream A, (b) Section B, (c) downstream C of piers.

Fig.8 Quadrant analysis at (a) upstream A, (b) uection B, (c) downstream C.

Fig.9 Occurrence probability of bursting events at (a) upstream A, (b) Section B, (c) downstream C.

Fig.10 Vertical distribution of higher order moments at (a) Upstream A, (b) Downstream C of piers.

Fig.11 Vertical distribution of TKE at (a) upstream A, (b) Section B, (c) downstream C of piers.

Fig.12 Vertical distribution of TKE Fluxes at (a) Upstream A, (b) Downstream C of piers.

Tab.2 Strouhal number at the downstream of piers

Fig.13 Contour profiles of Scour around arrangement T1 for (a) no seepage, (b)10% seepage, (c)15% seepage (all dimensions are in mm).

Fig.14 Contour profiles of Scour around arrangement T2 for (a) no seepage, (b)10% seepage, (c)15% seepage (all dimensions are in mm)

Fig.15 Scour depth at front pier and rear pier for arrangements T1 and T2 under no seepage, 10% seepage and 15% seepage conditions.

Fig.16 Variation of scour depth with time at upstream of (a) arrangement T1 and (b) arrangement T2.

Fig.17 Development of scour depth with time at upstream of piers. (a) Arrangement T1; (b) arrangement T2.

Fig.18 Longitudinal bed profile along the centre line for (a) arrangement T1 and (b) arrangement T2.

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