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

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

doi:10.3390/w11081676

Cited by 6 publications

(6 citation statements)

References 33 publications

(39 reference statements)

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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%

“…Physical model tests were performed in a glass sided flume (17.2 m length and 1.0 m width) having rectangular cross-section, with a flow recirculation arrangement (Lade et al 2019a(Lade et al , 2019b(Lade et al , 2019c. A 0.21 m layer of uniform river sand (Marsh et al 2004) having a median diameter = d 1.1 50 mm and geometric standard deviation ( ) s g as 1.1 was laid at the bottom of entire length of the channel.…”

Section: Methodsmentioning

confidence: 99%

“…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: Methodsmentioning

confidence: 99%

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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“…[11] and Barman et al [13,14], the excavation of a pit in an alluvial channel can induce erosion in the downstream side and can cause streambed instabilities around hydraulic structures such as bridge piers. Lade et al [18] conducted experimental research on a rectangular pit that was excavated upstream of two circular piers embedded in the sand-bed in a tandem arrangement. They found that mining activities near the piers can lead to significant changes in the flow field, causing excessive scour around piers.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Local Scouring around Hydrodynamic and Circular Pile Groups under the Influence of River Material Harvesting Pits

Daneshfaraz

Ghaderi

Sattariyan

et al. 2021

Water

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Mining activities can endanger the stability of hydraulic structures. Numerical modeling of local scouring around hydrodynamic and circular bridge pile groups, due to the action of clear water conditions via non-cohesive sediment, was performed using a computational fluid dynamics (CFD) model, a large eddy simulation (LES) turbulence model, and a van Rijn sedimentary model with FLOW-3D software. The pile groups were positioned upstream and downstream of a sand mining pit. The results showed that the scour depth around the downstream pile group was greater than that of the upstream one. Using hydrodynamic piers reduced the scour depth upstream of all piers and the material harvesting pit. The maximum reduction in scour depth was observed in front of the fifth pier, with a 29% reduction in scour depth. Additionally, for all models, as the material harvesting pit was moved downstream, the downstream turbulence was enhanced and stronger flow reversal and horseshoe vortices were detected in from of the downstream pile group. The flow patterns around the pile group showed that the presence of hydrodynamic piers in the upstream pile group leads to a decrease in the maximum flow velocity, whereas, when such piers were positioned in the downstream pile group, the velocity increases.

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“…The authors have been studying fluvial geomorphology and transport behavior of sediments (erosion/deposition) in alluvial channels, where turbulence plays as a key parameter in various fluvial environments such as: flow in a channel with curvilinear cross-section 7 , flows over bedforms 8 , flows with vegetation 9 , flows around bridge piers 10 , and flows in sand mined channels 11 . For the present study, we carried out extensive experiments in a laboratory flume setup at Department of Civil Engineering, Indian Institute of Technology Guwahati.…”

Section: Introductionmentioning

confidence: 99%

A novel Python module for statistical analysis of turbulence (P-SAT) in geophysical flows

Agarwal

Deshpande

Katoshevski

et al. 2021

Sci Rep

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We present Python Statistical Analysis of Turbulence (P-SAT), a lightweight, Python framework that can automate the process of parsing, filtering, computation of various turbulent statistics, spectra computation for steady flows. P-SAT framework is capable to work with single as well as on batch inputs. The framework quickly filters the raw velocity data using various methods like velocity correlation, signal-to-noise ratio (SNR), and acceleration thresholding method in order to de-spike the velocity signal of steady flows. It is flexible enough to provide default threshold values in methods like correlation, SNR, acceleration thresholding and also provide the end user with an option to provide a user defined value. The framework generates a .csv file at the end of the execution, which contains various turbulent parameters mentioned earlier. The P-SAT framework can handle velocity time series of steady flows as well as unsteady flows. The P-SAT framework is capable to obtain mean velocities from instantaneous velocities of unsteady flows by using Fourier-component based averaging method. Since P-SAT framework is developed using Python, it can be deployed and executed across the widely used operating systems. The GitHub link for the P-SAT framework is: https://github.com/mayank265/flume.git.

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

Cited by 6 publications

References 33 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

Investigation of Local Scouring around Hydrodynamic and Circular Pile Groups under the Influence of River Material Harvesting Pits

A novel Python module for statistical analysis of turbulence (P-SAT) in geophysical flows

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