Investigations on undercutting processes of cohesive river bank

Das, Vikas Kumar; Roy, Sayahnya; Barman, Krishnendu; Debnath, Koustuv; Chaudhuri, Sanjay; Mazumder, B. S.

doi:10.1016/j.enggeo.2019.03.004

Cited by 27 publications

(4 citation statements)

References 47 publications

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“…A slight increase in silt-clay content was found to have negligible effect on bank failure patterns, but could significantly shorten the time taken to collapse. A number of studies have been also carried out to investigate the role of impulsive flow due to dam-breaks (Cantelli et al, 2004;Zech et al, 2008), near-bank bed evolution (Yu et al, 2015), bank height (Patsinghasanee et al, 2017), channel bed slope (Qin et al, 2018), and near-bank turbulence (Das et al, 2019;Roy et al, 2019). Even though the focus of Qin et al (2018) was gully erosion, this type of process can be regarded as a downscaled case of bank erosion relevant also for tidal environments (e.g., for channel head migration).…”

Section: Near-bank Channel Flowmentioning

confidence: 99%

A Review on Bank Retreat: Mechanisms, Observations, and Modeling

Zhao

Coco

Gong

et al. 2022

Reviews of Geophysics

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Bank retreat plays a fundamental role in fluvial and estuarine dynamics. It affects the cross‐sectional evolution of channels, provides a source of sediment, and modulates the diversity of habitats. Understanding and predicting the geomorphological response of fluvial/tidal channels to external driving forces underpins the robust management of water courses and the protection of wetlands. Here, we review bank retreat with respect to mechanisms, observations, and modeling, covering both rivers and (previously neglected) tidal channels. Our review encompasses both experimental and in situ observations of failure mechanisms and bank retreat rates, modeling approaches and numerical methods to simulate bank erosion. We identify that external forces, despite their distinct characteristics, may have similar effects on bank stability in both river and tidal channels, leading to the same failure mode. We review existing data and empirical functions for bank retreat rate across a range of spatial and temporal scales, and highlight the necessity to account for both hydraulic and geotechnical controls. Based on time scale considerations, we propose a new hierarchy of modeling styles that accounts for bank retreat, leading to clear recommendations for enhancing existing modeling approaches. Finally, we discuss systematically the feedbacks between bank retreat and morphodynamics, and suggest that to move this agenda forward will require a better understanding of multifactor‐driven bank retreat across a range of temporal scales, with particular attention to the differences (and similarities) between riverine and estuarine environments, and the role of feedbacks exerted by the collapsed bank soil.

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Section: Near-bank Channel Flowmentioning

confidence: 99%

A Review on Bank Retreat: Mechanisms, Observations, and Modeling

Zhao

Coco

Gong

et al. 2022

Reviews of Geophysics

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“…Aside from the dams, the route also has undercut rocks that are found in the meandering segment that meets the rocky river cliffs. Undercuts accumulate energy and produce a strong current that can trap boats in a danger zone [29]. Bottlenecks are constrictions that form a rapid at a narrower channel.…”

Section: Rafting Tourism Potential Of Saba Rivermentioning

confidence: 99%

“…The formation of mainstreams and eddies at the meanders offers another attraction alongside Route SWISS (Figure 8d). A mainstream is the product of rock configurations in the river channel, whereas eddies are calm spots that appear together with the mainstream [29]. Route SWISS also has eddies on the mainstream, as well as stoppers, which is a large stone that creates an obstacle or barrier (Figure 8f).…”

Section: Rafting Tourism Potential Of Saba Rivermentioning

confidence: 99%

Preliminary River Morphometry Analysis for Rafting Tourism in the Saba River, Bali Island, Indonesia

SUPRAYOGI¹,

Mutaqin²,

Widyaningsih³

et al. 2020

IJSDP

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This study was designed to calculate the morphometry along the SWISS rafting route, as well as map the whitewater and analyze the risk management of the rafting tourism at the Saba River in Buleleng Regency, Bali, Indonesia. The whitewater mapping was conducted using a river morphometry analysis, and the morphometry data was collected using field measurements, topographics, and a geographic information systems vector analysis. The river morphometry, which plays an important role in the rafting sport, was quantified using the spatial aspects, topography, length of the main river, and river flow. The results showed that the river had a slope of 14.2 m/km, a dam-regulated flow rate of up to 4.02 m 3 /s, and water levels of 0.4-0.7 m. These figures indicate that the river channel and its hydrological characteristics are suitable for rafting activities, and it has been categorized as grade 2-3 rapids. Due to the improper risk management of whitewater rafting, this research recommends improving the skills of the tour guides or the members of the local tourism awareness group and preparing emergency response strategies that consider the site's accessibility and the available medical services.

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“…Research on failure mechanisms has developed from homogeneous to multi-layer slopes. Das and others studied the scour damage in cohesive homogeneous slopes [ 21 , 22 , 23 ]. Yu conducted scouring experiments on non-cohesive and cohesive homogeneous banks, revealing the iterative cycle of bank erosion and riverbed deformation [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Calculation Study on the Slope Stability of the Yellow River Floodplain from Wantan Town to Liuyuankou

Wang

Liu

et al. 2023

Toxics

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More than two million people live on the floodplains along the middle and lower streams of the Yellow River. The rapid development of industry and agriculture on both sides of the Yellow River has caused serious pollution of the floodplain soil. Erosion by water has led to the destruction of the floodplain which has not only compressed people’s living space but also resulted in a large amount of sediment containing heavy metals entering the river, aggravating water pollution. To further study the law governing the release of pollutants in soil, this work, based on field surveys of the Yellow River floodplain slopes from Wantan town to Liuyuankou, was focused on determining the failure mechanism and laws for the floodplain slope through the combination of a flume experiment and numerical calculations. The results showed that the floodplain slopes, composed of clay and silty sand, presented an interactive structure. Under the action of water erosion, the slope was first scoured to form a curved, suspended layer structure, and then the upper suspended layer toppled. The bank stability coefficient decreased by about 65% when the scour width increased from 0.07 m to 0.42 m, and the water content increased from 20% to 40%. For the failure characteristics, the angle of the failure surface was negatively correlated with the scour width, and the distance from the top failure surface to the bank edge was about 2.5 times that of the scour width.

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Investigations on undercutting processes of cohesive river bank

Cited by 27 publications

References 47 publications

A Review on Bank Retreat: Mechanisms, Observations, and Modeling

A Review on Bank Retreat: Mechanisms, Observations, and Modeling

Preliminary River Morphometry Analysis for Rafting Tourism in the Saba River, Bali Island, Indonesia

Experimental and Numerical Calculation Study on the Slope Stability of the Yellow River Floodplain from Wantan Town to Liuyuankou

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