Fluvial process and morphology of the Brahmaputra River in Assam, India

Sarma, J. N.

doi:10.1016/j.geomorph.2005.02.007

Cited by 185 publications

(132 citation statements)

References 30 publications

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“…In the late-1970s, 1980s and 1990s, as the sediment supply decreased, the river planfonn evolved through straight (Type 2), to meandering (Type 3) and later to an equilibrium, braided planfonn (Type 4). Hence, the sequence of planfonn changes in the lower reach of the Jamuna between 1967 and2005 may be explained by the changes in sediment supply envisaged in the conceptual model and also demonstrate good agreement with the scheme presented in Figure 3.5.…”

Section: Downstream Reach Of the Jamuna Riversupporting

confidence: 66%

“…al., 200 I;Mirza, 2002). On the other hand, a number of indications may be found in the literature suggesting that the 1950 Assam earthquake affected the Brahmaputra-JamunaPadma-Lower Meghna system in various ways (Krug, 1957;Goswami, 1985;Brammer, 1995;Zhou and Chen, 1998;Verghese, 1999;Sarker, et al, 2003;Goodbred et al 2003; Sarma and Phukan, 2004;Sarma, 2005). For example, Brammer (1995) suggested that the observed widening in the upstream reach of the Jamuna River during the 1970s and 1980s…”

Section: Working Hypothesismentioning

confidence: 99%

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Morphological Response of the Brahmaputra–Padma–Lower Meghna River System to the Assam Earthquake of 1950

Sarker

Thorne

2006

Braided Rivers

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Sediment rating curves Chapter 6 Conceptual model 174 6.1 Introduction 6.2 Celerity of the disturbance in a riverbed 6.3 Changes in the Independent Variables 6.3.1 Changes in the flow regime 6.3.2 Changes in bed sediment size 6.3.3 Changes in the sediment regime 6.4 Changes in the Dependent Variables 6.4.1 Changes in bed elevation 6.4.2 Changes in width 6.4.3 Changes in braiding intensity 6.4.4 Phase lags in the observed morphological changes 65 Development of the conceptual process-response model.. 201 6.5.1 Background 201 6.5.2Adjustments in the upstream reach of the Jamuna River 202 6.5.3 Downstream reach of the

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Section: Downstream Reach Of the Jamuna Riversupporting

confidence: 66%

Section: Working Hypothesismentioning

confidence: 99%

Morphological Response of the Brahmaputra–Padma–Lower Meghna River System to the Assam Earthquake of 1950

Sarker

Thorne

2006

Braided Rivers

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“…The region's dense and largely poor population is expected to become 50 % more urbanized by 2025 compared to today, causing even larger pressures on energy demand and natural resources (Singh and Goswami 2012;Ray et al 2015). Present land use changes and expansion of river infrastructure in the Brahmaputra river basin are already affecting both the sediment and hydrological conditions in the basin (Sarma 2005;Ray et al 2015). There is a large potential to expand both the downstream agricultural production and the upstream hydropower generation to increase the low living standards (Dikshit and Dikshit 2014), and such expansion would strongly influence hydrology.…”

Section: Introductionmentioning

confidence: 99%

“…Current monitoring of river characteristics and discharges of the Brahmaputra are, however, not freely accessible (Kibler et al 2014), and the lack of publically available data sets constrains the reproducibility of previously published results (e.g. Goswami 1985;Islam et al 1999;Sarma 2005). To overcome this lack of data, recent studies have focused on extracting basin data from satellite imagery, including river data (e.g.…”

Section: Introductionmentioning

confidence: 99%

Present to future sediment transport of the Brahmaputra River: reducing uncertainty in predictions and management

et al. 2016

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The Brahmaputra River in South Asia carries one of the world's highest sediment loads, and the sediment transport dynamics strongly affect the region's ecology and agriculture. However, present understanding of sediment conditions and dynamics is hindered by limited access to hydrological and geomorphological data, which impacts predictive models needed in management. We here synthesize reported peer-reviewed data relevant to sediment transport and perform a sensitivity analysis to identify sensitive and uncertain parameters, using the one-dimensional model HEC-RAS, considering both present and future climatic conditions. Results showed that there is considerable uncertainty in openly available estimates (260-720 Mt yr -1 ) of the annual sediment load for the Brahmaputra River at its downstream Bahadurabad gauging station (Bangladesh). This may aggravate scientific impact studies of planned power plant and reservoir construction in the region, as well as more general effects of ongoing land use change and climate change. We found that data scarcity on sediment grain size distribution, water discharge, and Manning's roughness coefficient had the strongest controls on the modelled sediment load. However, despite uncertainty in absolute loads, we showed that predicted relative changes, including a future increase in sediment load by about 40 % at Bahadurabad by 2075-2100, were consistent across multiple model simulations. Nevertheless, for the future scenarios we found that parameter uncertainty almost doubled for water discharge and river geometry, highlighting that improved information on these parameters could greatly advance the abilities to predict and manage current and future sediment dynamics in the Brahmaputra river basin.

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“…On the other hand, Fer gu son (1987) and Sarma (2005) sug gest that a change of river pat tern has a rel a tively short dura tion, even in the range of de cades. In our opin ion the Samica River changed its pat tern rap idly, be cause the en vi ron men tal im pulse -the re treat of nearby ice masses -was ex cep tion ally strong.…”

Section: Fig 9 Passega Graph Of Fluvial Depositsmentioning

confidence: 99%

What was an interglacial river like? Sedimentological investigation of Holsteinian fluvial deposits in eastern Poland

Zieliński

Terpiłowski

Zieliński

et al. 2015

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Holsteinian flu vial de pos its in the Samica River val ley in east ern Po land have been stud ied, in an ap prox i mately 12 m thick suc ces sion fill ing palaeochannels and com pris ing sandy chan nel fa cies suc ceeded by a pack age of gyttja, peat and silt depos ited in an ox bow lake. Chan nel belts in clud ing palaeochannel fills cut into outwash sands and are over lain by diamictic sands re worked by gelifluction un der periglacial con di tions. Sedimentological and palynological in ves ti ga tions in com bi nation al lowed the rec og ni tion of gla cial and inter gla cial de pos its. The chan nel belt was formed by a typ i cal sand-bed, me ander ing river with de po si tion con trolled by abun dant point bars. The sed i men tary evo lu tion of the Samica val ley is in ter preted in the con text of the gla cial-inter gla cial cy cle. Val ley-scale ero sion and change of river style from braided to me an der ing occurred co evally with the de cay of an ice sheet (deglaciation) and the main phase of me an der ing river sed i men ta tion is at tributed to the lat est Elsterian and early Holsteinian. The next part of the inter gla cial, from pi o neer stage to es tab lished tem per ate con di tions, is re corded in a biogenic ox bow-lake fill. The suc ces sion stud ied has been com pared with pub lished data on the Eu ro pean flu vial de pos its of Mid dle Pleis to cene interglacials. It is pointed out here that river chan nel pat terns in West ern and East ern Eu rope dif fered. Based on this ob ser va tion, some gen eral hy poth e ses re gard ing con ti nen tal-scale clima tic dis tinct ness are put for ward.

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Fluvial process and morphology of the Brahmaputra River in Assam, India

Cited by 185 publications

References 30 publications

Morphological Response of the Brahmaputra–Padma–Lower Meghna River System to the Assam Earthquake of 1950

Morphological Response of the Brahmaputra–Padma–Lower Meghna River System to the Assam Earthquake of 1950

Present to future sediment transport of the Brahmaputra River: reducing uncertainty in predictions and management

What was an interglacial river like? Sedimentological investigation of Holsteinian fluvial deposits in eastern Poland

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