Origin and some geomorphological changes of Majuli Island of the Brahmaputra River in Assam, India

Sarma, J. N.; Phukan, Manoj K.

doi:10.1016/j.geomorph.2003.07.013

Cited by 74 publications

(30 citation statements)

References 7 publications

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“…The Brahmaputra diverted its flow to the south to join its tributary the Burhi Dihing, thereby creating Majuli, one of the largest river islands around the year 1750 (Sarma and Phukan, 2004). A large bend of the Brahmaputra was straightened from Pandu to Hazo around 1532.…”

Section: Avulsion and Change In Channel To Develop Anabranchmentioning

confidence: 99%

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

2005

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Section: Avulsion and Change In Channel To Develop Anabranchmentioning

confidence: 99%

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

2005

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“…The Brahmaputra River divides the upper Assam valley into two distinct geographic zones, the north and the south banks. In addition, this reach of the river hosts one of the largest alluvial islands in the world, the Majuli Island, which is known for its unique cultural heritage (Sarma and Phukan, 2004) apart from its geomorphic significance. The Brahmaputra River shows significant geomorphic diversity in this region, which is strongly manifested in the morphodynamics of the river at a historical timescale.…”

Section: Introductionmentioning

confidence: 99%

Tectonic controls on the morphodynamics of the Brahmaputra River system in the upper Assam valley, India

Lahiri

Sinha

2012

Geomorphology

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“…Palaeochannels are the remnant geomorphic unit formed through the lateral shift of the rivers. Brahmaputra plain is covered by younger alluvial sediments at most of the places deposited from the sediment load carried by the river and its tributaries (Sarma and Phukan, 2004). The Brahmaputra is a braided stream showing the rapid lateral migration of as much as 800 m/year (Allison, 1998 The groundwater collected from geomorphic units were slightly acidic to alkaline in nature with most of the parameters well within the permissible limit of WHO except for fluoride, iron and arsenic.…”

Section: Variations Of Arsenic Concentration In Different Geomorphic mentioning

confidence: 99%

Utilisation of satellite data in identification of geomorphic landform and its role in arsenic release in groundwater

Singh

Shashtri

Mukherjee

2014

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:The present study was conducted to explore the influence of geomorphic features of the area on the mobilization of arsenic in groundwater. In this study, remote sensing and GIS techniques were used to prepare the geomorphic and slope map of the area. Different geomorphic features were identified on the basis of spectral signature on the LISS III and Landsat satellite image and field survey. Groundwater samples were collected from each representative geomorphic feature to inspect the arsenic contamination in the area. The study area is drained by the Brahmaputra river and its tributaries and contain mainly fluvial geomorphic units especially older flood plain, palaeochannels, oxbow lakes, channel islands; and hilly areas at some of the places. In this study it was observed that enrichment of arsenic in groundwater varies along the geomorphic units in following trends Paleochannel> Younger alluvial plain> Active flood plain> channel island > dissected hills. The above trend shows that a higher concentration of arsenic is found in the groundwater samples collected from the fluvial landforms as compared to those collected from structural landforms. Brahmaputra River and its tributaries carry the sediment load from the Himalayan foothills, which get deposited in these features during the lateral shift of the river's courses. Arsenic bearing minerals may get transported through river and deposit in the geomorphological features along with organic matter. The flat terrain of the area as seen from the slope map provides more residence time to water to infiltrate into the aquifer. The microbial degradation of organic matter generates the reducing environment and facilitates the dissolution of iron hydroxide thus releasing the adsorbed arsenic into the groundwater.

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Origin and some geomorphological changes of Majuli Island of the Brahmaputra River in Assam, India

Cited by 74 publications

References 7 publications

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

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

Tectonic controls on the morphodynamics of the Brahmaputra River system in the upper Assam valley, India

Utilisation of satellite data in identification of geomorphic landform and its role in arsenic release in groundwater

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