Morphotectonic evolution of the Majuli Island in the Brahmaputra valley of Assam, India inferred from geomorphic and geophysical analysis

Lahiri, Siddhartha Kumar; Sinha, Rajiv

doi:10.1016/j.geomorph.2014.04.032

Cited by 43 publications

(34 citation statements)

References 19 publications

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“…During the twentieth century , a total of 2358 square kilometer area from the Brahmaputra riverbank was eroded, and 1490 square kilometer of the area was accreted as ll, resulting in approximate 868 square kilometers of net land degradation in the Assam valley along the 630 km length of the Brahmaputra river 40 . Another study reported a loss of 35.5% loss of the land in the world's largest river island, " Majuli," situated in the upper reach of the Brahmaputra river in Assam 6 . Therefore, the protection of these banks is paramount for social, economic, and environmental sustainability.…”

Section: Experimental Summarymentioning

confidence: 99%

Biocementation Mediated By Stimulated Ureolytic Microbes From Brahmaputra Riverbank For Mitigation of Soil Erosion

Dubey

Ravi

Mukherjee

et al. 2021

Preprint

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Riverbank erosion is a global problem with significant socio-economic impacts. Microbially induced carbonate precipitation (MICP) has recently emerged as a promising technology for improving the mechanical properties of soils. The presented study investigates the potential of native calcifying bacterial communities of the Brahmaputra riverbank for the first time via biostimulation and explores its effect on the mitigation of soil erosion. The ureolytic and calcium carbonate cementation ability of the enriched cultures were investigated with reference to the standard calcifying culture of Sporosarcina pasteurii (ATCC 11859). 16S rRNA analysis revealed Firmicutes to be the most predominant calcifying class with Sporosarcina pasteurii and Pseudogracilibacillus auburnensis as the prevalent strains. The morphological and mineralogical characterization of carbonate crystals confirmed the calcite precipitation potential of these communities. The erosion resistance of soil treated with native calcifying communities was examined via needle penetration and lab-scale flume erosion test. We found a substantial reduction in soil erosion in the biocemented sample with calcite content of 7.3% and needle penetration index of 16 N/mm. We report cementation potential of biostimulated ureolytic cultures for a cost-competitive and environmentally-conscious alternative to current erosion mitigation practices.

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Section: Experimental Summarymentioning

confidence: 99%

Biocementation Mediated By Stimulated Ureolytic Microbes From Brahmaputra Riverbank For Mitigation of Soil Erosion

Dubey

Ravi

Mukherjee

et al. 2021

Preprint

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“…The reach is 140 km long, and its braided belt width varies between 1.2 km to 15 km, giving a wide accommodation space for morphological activity. The river exhibits severe braiding and makes its path tortuous, but at Tezpur and Guwahati, the river is geologically confined to a single channel (Goswami, 1985;Sarma, 2005;Lahiri and Sinha, 2014;Karmaker et al, 2017). The daily discharge hydrograph of the river is highly fluctuating (Goswami, 1985).…”

Section: Study Areamentioning

confidence: 99%

An entropy based morphological variability assessment of a large braided river

Chembolu

Dutta

2018

Earth Surf Processes Landf

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The present paper utilizes entropy to investigate variability in the surface areas of sandbars distribution of the Brahmaputra River, India. The intensity entropy disorder index (IDI) was computed for the dry and the post‐monsoon season for a selected reach of the river. The planform disorder index (PDI) was computed to represent the annual scale planform change due to seasonal flood. Finally, annual monsoon and peak flood stream power were evaluated and related to PDI. The results showed that the intensity disorder index followed a decreasing trend in dry and post‐monsoon seasons; tending towards lower deviation from a uniform distribution. It was noted that except for extreme flood years the PDI trend correlated well with monsoonal stream power. Distinctive trends in stream power were also observed in the present study. © 2018 John Wiley & Sons, Ltd.

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“…Recent studies on river morphology have extensively used satellite remote sensing imagery 3,[12][13][14][15][16][17] . Takagi et al 18 studied the river reach of Brahmaputra in Bangladesh and concluded that the river is in dynamic equilibrium stage with its stabilization waves propagating to the downstream.…”

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confidence: 99%

“…Akhtar et al 3 examined the stream power relation with braiding pattern and concluded that with low stream power, braiding intensity increases, which in turn intensify bank erosion. Lahiri and Sinha 16 carried out a geomorphologic study of Majuli island of Brahmaputra and concluded that the channel planform processes are related to the tectonic activity of the locality. In another study, Lahiri and Sinha 17 used fast fourier transform (FFT) of the bank lines to identify the regional and local control of the bank erosion.…”

mentioning

confidence: 99%

Study of Channel Instability in the Braided Brahmaputra River Using Satellite Imagery

Karmaker¹,

Medhi²,

Dutta³

2017

Current Science

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In the present study, instability of the river reach of Brahmaputra was analysed for braided belt width changes, braiding index and bar area. The river reach of the Brahmaputra from its confluence of Lohit, Dibang and Dihang to its confluence with the Tista river was studied from 1973 to 2009. The study was carried out using remotely sensed data from Landsat satellites at different dates. Discharge data synchronized with satellite data was collected by maintaining near-similar water level or discharge. Wavelet of the braided belt change was analysed to get the wavelet power and spatial extent of the changes. Finally, stream power was analysed from the average discharge data during the monsoon period to determine its effect on the instability of parameters considered. Results indicate that stream power does not directly relate to local changes in the braided belt or braiding index. However, with decrease in stream power, an increasing trend of bar area was found. Maximum wavelet power within a period showed a threshold behaviour at stream power of 5 W/km, beyond which the wavelet power raised sharply to a high value with increase in stream power. River response to the stream power was found at a global level rather than local level. Finally, a gradual decrease in stream power over time indicates the stable river reach. However, changes due to local bank erosion cannot be predicted using this analysis.

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Morphotectonic evolution of the Majuli Island in the Brahmaputra valley of Assam, India inferred from geomorphic and geophysical analysis

Cited by 43 publications

References 19 publications

Biocementation Mediated By Stimulated Ureolytic Microbes From Brahmaputra Riverbank For Mitigation of Soil Erosion

Biocementation Mediated By Stimulated Ureolytic Microbes From Brahmaputra Riverbank For Mitigation of Soil Erosion

An entropy based morphological variability assessment of a large braided river

Study of Channel Instability in the Braided Brahmaputra River Using Satellite Imagery

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