Study of flow turbulence around a circular bridge pier in sand-mined stream channel

Lade, Abhijit D.; Deshpande, Vishal; Kumar, Bimlesh

doi:10.1680/jwama.19.00041

Cited by 10 publications

(8 citation statements)

References 36 publications

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“…Such cases have been reported in rivers of central Spain, Poland, England, France, and India (Chen and Liu 2009, Brestolani et al 2015, Barman et al 2017. Experimental studies have confirmed the streambed instabilities around piers as well as transverse exposure of piers, because of dredging (Yanmaz and Cicekdag 2000, Lade et al 2019a, 2019b, 2019c, Lade and Kumar 2020. Recent studies have manifested the escalation of turbulent stresses and intensities in the region of sand removal and its downstream side , Barman et al 2018.…”

Section: Introductionmentioning

confidence: 75%

“…Previously, we studied the bursting events and randomness characteristics of turbulence in the proximity of an oblong pier due to the bed excavation using the Kolmogorov complexity spectrum (Lade et al 2019a(Lade et al , 2019b(Lade et al , 2019c. We noticed that dredging causes a wider spread of complexity across the instantaneous velocity scales.…”

Section: Introductionmentioning

confidence: 99%

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Effect of sand mining on the flow hydrodynamics around an oblong bridge pier

2021

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Extraction of sand from riverbed has catastrophic repercussions on aquatic animalia habitat, water quality, and the environment. Alongside, physical alterations in the fluvial hydraulics arising on account of sand mining are also worthy of attention. Flows passing over the pits excavated in a channel have enhanced erosive propensity, which can be a cause of concern for the downstream hydraulic structures. The complex nature of flow interacting with the bridge piers after passing over a mining pit is not fully understood. Experiments were conducted to apprehend the effects of a dredged pit on the turbulence flow-field around an oblong pier. Flow was passed in an erodible sand bed rectangular channel having an oblong pier for the first case. In the second case, a pit was dredged in the mobile bed to replicate a mined channel, and the pier was subjected to the same discharge. The streambed at the approach of the pier experiences greater mean bed shear because of dredging. The amplification of the instantaneous bed shear beneath the turbulent horseshoe vortex (THSV) zone at the pier front is almost twice due to channel dredging. The findings can be useful in understanding the streambed instabilities around bridge piers in mining-infested channels.

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Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Effect of sand mining on the flow hydrodynamics around an oblong bridge pier

2021

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“…Sand extraction from riverbeds has become a thriving practice as it generates quick profit for the extracting party with low to no risk or harmful effect on the extracting party. The EIA study magnifies turbulence characteristics in the downstream flow (Barman, Kumar, & Sarma, 2018; Barman, Kumar, & Sarma, 2019a; Barman, Kumar, & Sarma, 2019b; Daneshfaraz et al, 2021; Lade, Deshpande, & Kumar, 2020; Neyshabouri, Farhadzadeh, & Amini, 2002, Padmalal & Maya, 2014). It aggravates the erosion/scouring of the river structures of interest (Lade & Kumar, 2020; Li, Wang, Ma, & Nie, 2020).…”

Section: Introductionmentioning

confidence: 94%

“…The EIA study magnifies turbulence characteristics in the downstream flow (Barman, Kumar, & Sarma, 2018;Barman, Kumar, & Sarma, 2019a;Barman, Kumar, & Sarma, 2019b;Daneshfaraz et al, 2021;Lade, Deshpande, & Kumar, 2020;Neyshabouri, Farhadzadeh, & Amini, 2002, Padmalal & Maya, 2014. It aggravates the erosion/scouring of the river structures of interest Li, Wang, Ma, & Nie, 2020).…”

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confidence: 97%

Turbulence structure and bank erosion process in a dredged channel

Arora

Patel

Lade

et al. 2023

River Research & Apps

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Riverbank erosion has significant geomorphological as well as anthropogenic consequences. The geomorphological impacts include form changes such as lateral channel migration, meanders, channel expansion, etc. The anthropogenic effects include the threat to floodplain human habitation, agricultural land, and stability of instream hydraulic structures and buried pipelines. Channel dredging for the extraction of sand and gravel has seen a multi‐fold rise in the last few decades. Therefore, riverbank erosion response to channel mining gains importance in river basin management. Sandpits dredged in the riverbeds can significantly impact the downstream riverbank stability. In order to assess these impacts, we conducted a series of experiments at a laboratory scale in a recirculating water flume. Three riverbank slopes, 25° (gentle), 31° (equal to the angle of repose of the bank sediments), and 40° (steeper than the angle of repose), were tested along with a sandpit. Remarkable changes in the turbulence structure of riverbank flow were found due to the channel pit. Pit excavation directly impacts the fluvial erosion characteristics of the riverbank. Pit action increases the Reynolds shear stress fields in the near‐bank flow, which causes progressive fluvial erosion of the berm at the bank toe. The erosivity of the main channel flow in the riverbank also leads to channel degradation, which increases the exposed height of the bank slope. Pit dredging leads to the generation of stronger ejection bursts which provide a mechanism for berm sediment mobility and erosion. The hydro morphological response of the riverbank due to sand mining was analysed, and process understandings are presented in the paper.

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“…Gautam channel with a straight path [18]. Lade et al (2020) examined the effect of mining pit on hydrodynamics around circular bridge piers in a laboratory channel with a straight path [19].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Flow Pattern around Rectangular and Oblong Piers with collar Located in a 180o Sharp Bend

2021

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Flow in river bends is associated with generation of secondary flows that leads to a rather complicated flow pattern around bridge piers located in the bend. In this study, the flow patterns around rectangular and oblong piers models with collar located at the 90 o angle of a 180-degree sharp bend in an experimental plume were investigated. The 3D flow velocity data were collected using a Vectrino velocimeter. The experimental results indicated that the presence of the rectangular pier caused more intense deviation of the streamlines towards the outer bank of the bend. Furthermore, installation of the oblong pier, the maximum secondary flow power and angular velocity were decreased, respectively, by 35% and 45% in comparison with the installation of the rectangular pier. In addition, it was found that the maximum turbulence kinetic energy around the two piers was not significantly different, but by installing the rectangular pier, a region with high values of turbulence kinetic energy is formed at 90° near the inner bank. Also, installation of oblong pier reduces the values of shear stress in comparison with the use of the rectangular pier.

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Study of flow turbulence around a circular bridge pier in sand-mined stream channel

Cited by 10 publications

References 36 publications

Effect of sand mining on the flow hydrodynamics around an oblong bridge pier

Effect of sand mining on the flow hydrodynamics around an oblong bridge pier

Turbulence structure and bank erosion process in a dredged channel

Investigation of Flow Pattern around Rectangular and Oblong Piers with collar Located in a 180o Sharp Bend

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