Role of hydrological regime and floodplain sediments in channel instability of the Bhagirathi River, Ganga-Brahmaputra Delta, India

Guchhait, Sanat Kumar; Islam, Aznarul; Ghosh, Sandipan; Das, Balai Chandra; Maji, Nishith Kumar

doi:10.1080/02723646.2016.1230986

Cited by 69 publications

(10 citation statements)

References 54 publications

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“…The facies at the interfluve region and left-bank flood plain of the Jalangi river depict similar characteristics i.e. facies dominated by sand instead of clay as on the right bank of Bhagirathi-Hooghly river (Guchhait et al, 2016). The BH 5 at Narayanpur shows fine-grained facies-Fl, Fm, only up to 60 m from the surface beyond which sand facies ( Sh, St, and Sr) dominate up to 130 m which clearly shows an upward fining sequence.…”

Section: Bank Materials Composition and Fluvial Architecturementioning

confidence: 90%

“…Thus the three confluence points constitute a triangular area having an extension from 23° 39´22" N to 23° 24´ 40" N and from 88° 08´ 14" E to 88° 31´ 02" E ( Figure 1). In this area, the Bhagirathi is roaming over the region extending from the lateritic belt at the western margin and up to the river Jalangi in the east which is very clear from the palaeochannels of Bhagirathi (Guchhait et al, 2016). But river Jalangi once an active channel is now virtually dead because it is presently disconnected from the Padma.…”

Section: Geomorphic Set Up Of the Study Areamentioning

confidence: 98%

“…Rennell, 1788;Sherwill,1858;Hirst,1915;Mukherjee, 1938;Bandyopadhyay,1996;Ray, 1999;Bhattacharya, 2000;Rudra, 2010) and meander behaviour (e.g. Basu, 1976;Basu et al, 2005;Guchhait et al, 2016;Islam and Guchhait, 2017a). The meander belt width of this active deltaic river channels has become a matter of serious concern as it is one of the most densely populated areas in the world.…”

Section: Introductionmentioning

confidence: 99%

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Assessing meander belt width of Bhagirathi-Jalangi river system in lower Ganga delta, India

Islam¹,

Das²,

Maji³

et al. 2020

EJG

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The present work is an attempt to assess the meander belt width of the river Bhagirathi (frequently oscillating) and river Jalangi (relatively stable) in West Bengal, India based on geospatial data and field data (lithological composition and flow characteristics). Belt width has been computed using four major considerations in increasing order of scale- (i) individual loops of the present channel (MBw1), (ii) maximum loop width of the present channel (MBw2), (iii) palaeo channel characteristics identified through normalized difference water index and pixel-based classification coupled with field observation (MBw3) and (iv) future channel based on the factor of safety which is a space-time averaged safe belt width (MBw4). The study found MBw4 of 11.76 km for Bhagirathi and 6.64 km for Jalangi considering the 100-year factor of safety. The higher meander belt width of Bhagirathi in comparison to Jalangi was found to be correlated with higher monsoon discharge, bed slope, stream power, shear stress, suspended surface sediment concentration, D50, and lower relative bed stability.

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Section: Bank Materials Composition and Fluvial Architecturementioning

confidence: 90%

Section: Geomorphic Set Up Of the Study Areamentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Assessing meander belt width of Bhagirathi-Jalangi river system in lower Ganga delta, India

Islam¹,

Das²,

Maji³

et al. 2020

EJG

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“…1). This region is very unstable due to hydro-dynamic characteristics which are controlled by hydrologic input from the Farakka Barrage Project and the Ajay-Mayurakshi system (Guchhait et al, 2016). This area is densely populated, dominated by agrarian communities.…”

Section: Study Areamentioning

confidence: 99%

“…There are 26 community development (C.D.) blocks along the banks of the Bhagirathi River out of which seventeen are in Murshidabad, five are in the Barddhaman district, and the remaining four are in the Nadia district (Guchhait et al, 2016). The villages of Matiari, Akandanga, Rukunpur, and Ganjadanga, located astride the left bank of the Bhagirathi River in the Nadia District ( Fig.…”

Section: Severity Of Riverbank Erosionmentioning

confidence: 99%

Analysis of Social and Psychological Terrain of Bank Erosion Victims: A Study Along the Bhagirathi River, West Bengal, India

Islam

Guchhait

2018

Chin. Geogr. Sci.

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Social psychology of people affected by hazards is different from normal psychology. For example, severe bank erosion in the lower reach of the Bhagirathi River in West Bengal has resulted in significant land loss (~60% of all households lost land over last 20 years) and affected the livelihoods of the people in the study villages along the river. Per capita income has almost halved from 1970-2012 due to land loss. This stark nature of land erosion and vulnerability of livelihood has had far-reaching repercussions on the fabric of society and the psychology of the people in this region. Results showed that erosion-affected villages have registered comparatively larger average family sizes (~4.1 as compared to ~3.9 in non-affected villages), lower literacy levels (< 50% compared to > 65% for the non-affected villages), and poor health. Reports of poor health as a result of land erosion include ~60% of the respondents having reported physical ailments such as headache and abdominal discomfort, as well as 3%-5% reporting loss of emotional and psychological balance. Villages suffering from erosion showed higher positive loadings in average-coefficient of variation (CV) differential (25%-40%) depicting objectivity in their opinions for select variables of social processes. Principal component analysis (PCA) portrayed maximum eigenvalues in the first principal component for interpersonal processes (~98%) and a minimum for intergroup processes (~80%). Categorical principal component analysis (CATPCA) depicted a cluster between interpersonal and intergroup processes and another between intra-individual and group categories. The positive loadings in female-male differences in CV of perceptions portrayed relative consistency of males over the females concerning fear/phobia and physical stress while negative loadings exhibited higher consistency for females regarding psychological stress and shock. Lastly, the Tajfel matrix portrayed a distinction between hazard psychology characterized by maximum joint profit as found in Rukunpur, and normal psychology characterized by in-group favoritism as found in Matiari.

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Morphological Landscape Mapping of the Bhagirathi Flood Plains in West Bengal, India, Using Geospatial Technology

Mondal

Bandyopadhyay

2022

Geography of the Physical Environment

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Role of hydrological regime and floodplain sediments in channel instability of the Bhagirathi River, Ganga-Brahmaputra Delta, India

Cited by 69 publications

References 54 publications

Assessing meander belt width of Bhagirathi-Jalangi river system in lower Ganga delta, India

Assessing meander belt width of Bhagirathi-Jalangi river system in lower Ganga delta, India

Analysis of Social and Psychological Terrain of Bank Erosion Victims: A Study Along the Bhagirathi River, West Bengal, India

Morphological Landscape Mapping of the Bhagirathi Flood Plains in West Bengal, India, Using Geospatial Technology

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