Turbulence structure and bank erosion process in a dredged channel

Sukhjeet Arora; Harish K. Patel; Abhijit D. Lade; Bimlesh Kumar

doi:10.1002/rra.4100

journal article Jan 06, 2023

Turbulence structure and bank erosion process in a dredged channel

Sukhjeet Arora

Harish K. Patel

Abhijit D. Lade

Bimlesh Kumar

River Research and Applications Vol. 39 No. 4 pp. 613-628 · Wiley

View at Publisher Save 10.1002/rra.4100

Abstract

AbstractRiverbank 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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Metrics

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Citations

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References

Details

Published: Jan 06, 2023
Vol/Issue: 39(4)
Pages: 613-628
License: View

Authors

S

Sukhjeet Arora

Department of Civil Engineering Indian Institute of Technology Guwahati (IITG) Guwahati India

H

Harish K. Patel

Department of Civil Engineering Indian Institute of Technology Guwahati (IITG) Guwahati India

A

Abhijit D. Lade

Department of Civil Engineering Visvesvaraya National Institute of Technology (VNIT) Nagpur India

B

Bimlesh Kumar

Department of Civil Engineering Indian Institute of Technology Guwahati (IITG) Guwahati India

Funding

Indian Institute of Technology Guwahati

Cite This Article

Sukhjeet Arora, Harish K. Patel, Abhijit D. Lade, et al. (2023). Turbulence structure and bank erosion process in a dredged channel. River Research and Applications, 39(4), 613-628. https://doi.org/10.1002/rra.4100

Turbulence structure and bank erosion process in a dredged channel

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