Channel planform dynamics, avulsion and bankline migration: a study in the monsoon-dominated Dwarkeswar river, Eastern India

Ghosh, Biman; Mukhopadhyay, Sutapa

doi:10.1007/s12517-021-07270-5

Cited by 10 publications

(2 citation statements)

References 27 publications

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“…This continual shifting is mainly due to the huge amounts of discharge and sediment load along the reach (Coleman 1969). Ganges is migrating its courses laterally and occupying new spaces continuously (Ghosh and Mukhopadhyay 2021). The main channel of the Ganges is an alluvial-type meandering river that has been maintaining a south-easterly ow direction (Rudra 2014).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Bank Erosion in the Ganges River, Bangladesh: An Integrated Geological, Geotechnical, and Hydrogeological Study

Preota,

Rahman,

Mia

et al. 2023

Preprint

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The purpose of the research was to integrateally characterize the erosional behavior of the Ganges riverbanks and understand the geological, geotechnical, and hydrological influence on bank erosion. The current study has used multi-temporal Landsat images spanning from 1973–2020 for planform analysis using Geographic Information System (GIS), geological fieldwork data, six standard penetration test (SPT) data, laboratory analysis, and slope stability model using SLIDE to understand geological-geotechnical factors and the influence of seasonal hydrological fluctuations on the bank erosion. GIS-based planform analysis identified the erosion-accretion rate and vulnerable areas for erosion. Results suggest that the intensity of bank erosion is higher at the outer meander bend, and the right bank is more erosion-prone than the left bank. Geological and geotechnical studies suggest that bank material types and their degree of cohesion control bank erosion. In the convex outer bend of the river, the helical flow erodes the non-cohesive sandy materials at the toe of the bank, hence, the upper clayey layer loses its strength and collapses, which is the main cause of the cantilever-type bank failure in this river. Results also suggest that the Factor of Safety (FS) is proportional to the difference between river water level (RWL) and groundwater level (GWL) in the uniformly graded high permeable soil. When the water level gradient shifts from GWL toward RWL, the FS of the bank slope decreases and collapses after reaching its critical point.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Bank Erosion in the Ganges River, Bangladesh: An Integrated Geological, Geotechnical, and Hydrogeological Study

Preota,

Rahman,

Mia

et al. 2023

Preprint

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“…Studying 30 bends of the Trinity River in Texas, Mason and Mohrig (2019) identified a constant river width at a bend that was sustained by counterbalancing erosion and deposition during the migration process. Among many other studies on meandering rivers, lateral migration in flood season and thus reach‐ and time‐scale changes of meander geometry were studied (Ghosh & Mukhopadhyay, 2021). A single bend was analyzed in Yousefi et al (2021) to identify the change in the meander loop by a sudden extended flood.…”

Section: Introductionmentioning

confidence: 99%

Assessment of meander‐bend migration of a major distributary of the Ganges River within Bangladesh

Ferdoush

Biswas

Mondal

2022

River

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The Arial Khan is an important distributary river of the Ganges River within Bangladesh. The river is meandering, and channel shifting and bend migration are common. This study investigates the bend‐scale morphology of 37 characteristic bends of the river using Landsat imageries, river bathymetries, and hydrological data. The morphological changes of the river are correlated with the temporal shifting of its offtake, which in turn is linked to the dynamic behavior of the river in terms of sinuosity, bend geometry, and bend migration. Alterations in the offtake location, bed elevation, and in‐front bar formation are found to control the flow to the river. The sinuosity varies from 1.62 to 1.95 and is linked to the shifting of its offtake. The lifetimes of the bends increase from upstream to downstream with an average lifetime of 24 years. The radii of the bends vary from upper to lower reaches with an average radius of 921 m. The upper reach is more migration prone, and its average migration rate (108 m/year) is more than twice the other two reaches. A higher migration rate of 70–80 m/year is found for the river during 1981–1999 compared to the rates of 45–50 m/year for the rest of the study periods (1972–2021). An envelope curve depicting the relation between the relative curvature of a bend and its migration rate for the river is also developed. The overall morphology from 1972 to 2021 indicates that a significant increase in sinuosity and a reduction in river width and aspect ratio have occurred. The migration rate has declined slightly and the frequency of bend cutoffs has reduced notably in recent years. Nonetheless, due to the high rates of migration, there exists potential future threat to riverbank erosion in some critical bends, and hence damages to land, property, structure, and project on the vulnerable banks.

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Spatial and Temporal Planform Study of River Godavari Between Polavaram and Dowleswaram Bridge

Akkinepally,

Kumar,

Pandey

2024

Sustainable Development and Geospatial Technology

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Channel planform dynamics, avulsion and bankline migration: a study in the monsoon-dominated Dwarkeswar river, Eastern India

Cited by 10 publications

References 27 publications

Evaluation of Bank Erosion in the Ganges River, Bangladesh: An Integrated Geological, Geotechnical, and Hydrogeological Study

Evaluation of Bank Erosion in the Ganges River, Bangladesh: An Integrated Geological, Geotechnical, and Hydrogeological Study

Assessment of meander‐bend migration of a major distributary of the Ganges River within Bangladesh

Spatial and Temporal Planform Study of River Godavari Between Polavaram and Dowleswaram Bridge

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