Multiscale characterization of migrating sand wave in mining induced alluvial channel

Barman, Bandita; Sharma, Anurag; Kumar, Bimlesh; Sarma, Arup Kumar

doi:10.1016/j.ecoleng.2017.02.021

Cited by 18 publications

(7 citation statements)

References 21 publications

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“…Experimental and field studies revealed morphological changes in terms of bed and bank erosion due to the presence of in-stream mining. Longitudinal profiles after four hours along the centre line of the channel for Set-I and Set-III are presented in Figure 5 and a similar trend has been observed as obtained by the previous researchers for the rectangular pit (Lee et al, 1993;Neyshabouri et al, 2002;Barman et al, 2017). In Figure 5, bed elevations along the centerline of the channel have been plotted for five different discharges at a particular instant for the trapezoidal shaped mining pit.…”

Section: Morphological Characteristicssupporting

confidence: 78%

“…Experimental and field studies revealed morphological changes in terms of bed and bank erosion due to the presence of in‐stream mining. Longitudinal profiles after four hours along the centre line of the channel for Set‐I and Set‐III are presented in Figure and a similar trend has been observed as obtained by the previous researchers for the rectangular pit (Lee et al ., ; Neyshabouri et al ., ; Barman et al ., ).…”

Section: Resultsmentioning

confidence: 97%

“…Barman et al . () analysed the physical and dynamic characteristics of channel bed deformation due to the presence of a rectangular mining pit and observed occurrence of higher shear stress downstream of the pit, which caused more erosion at the downstream than the upstream.…”

Section: Introductionmentioning

confidence: 99%

“…Neyshabouri et al (2002) also conducted field investigations by using the excavated pit on different sections of a straight river reach and observed similarity in the trend of pit migration to experimental results. Barman et al (2017) analysed the physical and dynamic characteristics of channel bed deformation due to the presence of a rectangular mining pit and observed occurrence of higher shear stress downstream of the pit, which caused more erosion at the downstream than the upstream.…”

Section: Introductionmentioning

confidence: 99%

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Turbulent flow structures and geomorphic characteristics of a mining affected alluvial channel

Barman

Kumar

Sarma

2018

Earth Surf Processes Landf

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Sediment mining in rivers may have a major impact on river geomorphology and research is required to quantify these impacts. In this research, experimental studies were conducted to analyse the morphological changes of channel bed and the turbulent characteristics of flow in the presence of mining. The channel bed profile shows erosion at the bank of the pit and that the erosion expands to the whole width of the channel and propagates downstream with time. The deposition of sediment occurs along the upstream edge of the pit and the depth of the pit decreases with time. Velocity reversal occurs at the central bottom of the pit related to a recirculation zone. Reynolds shear stress and the turbulent intensities become higher in the mining pit region and downstream of it as compared to the upstream section, causing a more rapid movement of bed particles. Analysis of the bursting phenomenon shows that the contribution of sweep and ejection events to the total Reynolds shear stress is more dominant over outward and inward interaction events. The dominance of the sweep event over ejection is observed at the near‐bed region for all the sections, but the depth range of dominance of sweep events in the pit and downstream of the pit is found to be more than the upstream. The increase in thickness is responsible for the increase in bed material transport. The increased sediment transport capacity at the mining pit and downstream of it caused the deformation and lowering of channel bed downstream. An empirical formulation of bedload transport for mining induced channels is derived from two different sized uniform bed materials. Copyright © 2018 John Wiley & Sons, Ltd.

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Section: Morphological Characteristicssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Turbulent flow structures and geomorphic characteristics of a mining affected alluvial channel

Barman

Kumar

Sarma

2018

Earth Surf Processes Landf

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“…The upstream bed of the mining zone erodes and the slope of the channel steepens (Collins & Dunne, 1989; Kondolf, 1994). Downstream of the mining pit the channel experiences erosion and migration of the pit occurs (Barman, Sharma, Kumar, & Sarma, 2017; Erskine, 1990; Jang, Shimizu, & Lee, 2015; Lee, Deng‐Tsuang, & Song, 1993). Mining also leads to channel instabilities in the form of lateral erosion of the river banks (Wyżga, 2001).…”

Section: Introductionmentioning

confidence: 99%

Streambed instabilities around a bridge pier in a dredged channel

Lade

Kumar

2020

River Research & Apps

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We conducted flume experiments to study the morphological behaviour around a circular pier located downstream of a mining pit. Severe transverse erosion at the pier base as well as lowering of channel bed upstream of the pier was observed because of channel dredging. Streambed instability was analysed based on two non‐dimensional parameters, namely, pier exposure factor and normalized upstream incision depth. The maximum values of both these parameters were observed when the mining pit was dredged closest to the pier. We also observed growth in streambed instability with an increase in flow Reynolds number.

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River Sand Mining and its Management: A Global Challenge

Bhattacharya

Chatterjee

2021

River Sand Mining Modelling and Sustainable Practice

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Multiscale characterization of migrating sand wave in mining induced alluvial channel

Cited by 18 publications

References 21 publications

Turbulent flow structures and geomorphic characteristics of a mining affected alluvial channel

Turbulent flow structures and geomorphic characteristics of a mining affected alluvial channel

Streambed instabilities around a bridge pier in a dredged channel

River Sand Mining and its Management: A Global Challenge

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