Geomorphic Appraisal of Active Tectonics and Fluvial Anomalies in Peninsular Rivers of the Bengal Basin (West Bengal, India)

Ghosh, Sandipan

doi:10.1007/978-3-030-79634-1_23

Cited by 6 publications

(2 citation statements)

References 48 publications

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“…(Continued.) Khandaghosh-Garhmayna Fault, and Pingla Fault) (Ghosh 2022) and (b) the dam-controlled river is jacketed by elevated embankments at both banks to stop oscillation in the floodplain (i.e., anthropogenic confinement) (Bhattacharyya 2011).…”

Section: Changes In Channel Morphologymentioning

confidence: 99%

Assessment of dam-induced changes in ecogeomorphological behaviour and fluvial functionality in the Damodar River, West Bengal, India

Ghosh¹,

Hoque

Saha

et al. 2022

Journal of Water Supply: Research and Technology-Aqua

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Anthropogenic interventions in the form of dams and barrages often alter the fluvial functionality and eco-geomorphological (geomorphology, hydrology, and ecology) behaviour of river systems. The present work examines the environmental flow, channel metamorphosis, and fluvial functionality of the Damodar River in the context of Damodar Valley Corporation (DVC) dams and development. Structural (dams, barrages, weirs, etc.) and non-structural (urban––industrial and agricultural disposal with effluents, sand mining, etc.) interventions hinder the ecological functionality of the river. This study portrays that the eco-geomorphological behaviour and fluvial functionality of the river have changed due to flow alteration and diversion by dams and barrages and due to rapid urban–industrial and agricultural growth in the basin area. These changes have affected riverine ecological integrity. The ecological functionality level of this study area ranges from 85 to 181, i.e. from poor to good–fair. The ecological functionality level in the sample channel sections (i.e., the immediate upstream and downstream of the Durgapur Barrage) is poor, and the value ranges from 61 to 100 due to the hydrological impact of the bar rage and the Durgapur urban–industrial belt. This assessment work will help to restore the fluvial environment for humans as well as riverine biota. HIGHLIGHTS Dams and barrages have altered the hydrological flow regimes, affecting the eco-geomorphological behaviour of alluvial channels. Dam-induced fluvial metamorphosis is evident in the channel morphological parameters and channel classification. The fluvial functionality index has been applied to evaluate the ecological functionality level for the restoration of the riverine environment.

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Section: Changes In Channel Morphologymentioning

confidence: 99%

Assessment of dam-induced changes in ecogeomorphological behaviour and fluvial functionality in the Damodar River, West Bengal, India

Ghosh¹,

Hoque

Saha

et al. 2022

Journal of Water Supply: Research and Technology-Aqua

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“…The Bengal Basin, the largest peripheral collisional foreland basin of the Himalayas, is crucial due to its proximity to several distinct geological features such as the Main Boundary Thrust Fault (MBT) of the Himalayas and the Shillong Plateau, the Bengal Delta—the world's largest delta drained by the Ganges and Brahmaputra river network, the Bay of Bengal and the Bengal Deep‐Sea Fan‐world's largest submarine fan, the Chittagong‐Tripura Fold Belt (CTFB) and the Indo‐Burman Range (IBR) (e.g., Alam et al, 2003; Gosh, 2022; Figure 1a–c). Moreover, the ongoing (since Late Miocene) oblique subduction/convergence of the Indian Plate under the Burmese microplate in the north and north‐east makes this region critical in terms of seismicity and intraplate crustal deformation (Gani & Alam, 1999; Hossain et al, 2022; Steckler et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Quantitative tectonic geomorphic study from bedrock rivers of the Fold and Thrust Belt in the Bengal Basin

Shrestha

Gani

2023

Geological Journal

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Research on the Bengal Basin, the most important sedimentary basin in the world that supports ~200 million people, is primarily focused on its geologic evolution and anthropogenic effects, yet the basin is poorly studied in terms of geomorphic response to tectonic activity. The eastern part of the Bengal Basin is characterized by the Chittagong Tripura Fold Belt (CTFB) and the Indo‐Burman Range (IBR), which have structurally deformed into a series of mostly compressional fold and thrust belts including strike–slip faults because of the ongoing subduction‐related convergence between the Eurasian Plate and the Indian Plate. A network of river channels incising through thick sedimentary rocks and crossing and/or flowing parallel to this fold and thrust Belt. The active tectonic deformation caused by the structures and ongoing compression‐related activity remains enigmatic due to the sparse dataset, thick vegetation cover, outcrop paucity, and the Basin's complex geology. In this paper, we investigate river response to ongoing tectonics in the CTFB and western IBR by analysing channel geomorphic metrics (ksn, χ, and knickpoints) coupled with river profile forms derived from 30 m resolution NASADEM. Our results reveal (1) several convex and double‐concave reaches of major rivers and their tributaries that primarily indicate the transient state of the rivers; (2) a total of 219 upstream propagating knickpoints including distinct knickzones in profile reaches, suggesting river profile adjustment; (3) two different ksn zones in the CTFB and IBR with high ksn zone to the east and low ksn zone to the west, where ksn values range from 0 to 4905. These zones are thought to be associated with the differential uplift rate of the two east‐dipping thrust fault systems, the Kaladan Fault and Chittagong Cox's Bazar Fault (CCF); and (4) the χ‐ map (values ranging from 0.47 to 19,631.75) shows an occasional transient state of drainage divides where divides are migrating to the east, west, and north‐east, and χ versus elevation plots exhibiting disequilibrium state of the rivers suggesting that these drainage basins are likely adjusting with tectonic activities. Thus, our empirical observation suggests that the major rivers and their tributaries are in a transient state related to the region's overall ongoing tectonics.

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Planform adjustments of sub-Himalayan Mahananda-Balason River over five decades in response to anthropogenic interventions

Mitra,

Mondal,

Datta

et al. 2023

Arab J Geosci

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Geomorphic Appraisal of Active Tectonics and Fluvial Anomalies in Peninsular Rivers of the Bengal Basin (West Bengal, India)

Cited by 6 publications

References 48 publications

Assessment of dam-induced changes in ecogeomorphological behaviour and fluvial functionality in the Damodar River, West Bengal, India

Assessment of dam-induced changes in ecogeomorphological behaviour and fluvial functionality in the Damodar River, West Bengal, India

Quantitative tectonic geomorphic study from bedrock rivers of the Fold and Thrust Belt in the Bengal Basin

Planform adjustments of sub-Himalayan Mahananda-Balason River over five decades in response to anthropogenic interventions

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