MCA on mechanism of river bed potholes growth: a study of middle Subarnarekha River basin, South East Asia

Dhali, Kutubuddin; Biswas, Mery

doi:10.1007/s10668-017-0069-8

Cited by 11 publications

(3 citation statements)

References 33 publications

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“…For understanding the dynamic nature of the formation of the bar in piedmont region, multi-criteria analysis has been applied, [54][55][56] Principal component analysis method (PCA) is used for proper clarification. Geo-hydrological components such as bed slope, water discharge, gradient, bed elevation, velocity, roughness, specific stream power, and shear stress have considered as parameters for this analysis.…”

Section: Mca Modelsmentioning

confidence: 99%

Formation, Migration, and Morphodynamic Alteration of 50 Channel Bars in Darjeeling Himalayan Piedmont Zone, India

Dhali

Mukhopadhyay

2020

Air, Soil and Water Research

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Channel bars are common, striking fluvio-geomorphic depositional features of alluvial rivers. The study of this article has aimed to investigate the formation, migration, and morphodynamic alteration of channel bars (n = 50) in gravel braided alluvial rivers in Darjeeling Himalayan Piedmont zone. Dynamics of micro to meso bar deposition is mainly accomplished by the channel gradient, huge upstream landslide, and variation of discharge. Multi-criteria analysis method has been used to explain the variation of principal component analysis (PCA1, PCA2, and PCA3), both monsoon to post-monsoon. Bridge scouring, empirical aggradation, and degradation values are 0.1 to 1.05 m and [Formula: see text]. Migration, re-generation, and degradation of the micro bars with their optimum morphology show changes during the rainy season. In the upper ([Formula: see text]), middle ([Formula: see text]), and lower ([Formula: see text]) piedmont region, the bar dynamic area are 0.12 to 0.71, 0.12 to 2.83, and 0.10 to 5.43 km2, respectively. In total, 58% to 72% stability of the channel bars is observed in the upper piedmont region. The coefficient of determination ( R²) of channel bar area and width shows positive (0.63) relation.

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Section: Mca Modelsmentioning

confidence: 99%

Formation, Migration, and Morphodynamic Alteration of 50 Channel Bars in Darjeeling Himalayan Piedmont Zone, India

Dhali

Mukhopadhyay

2020

Air, Soil and Water Research

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“…Riverine potholes are very dynamic, and con ned geomorphic structures seen on the rock surface of the river bed (Dhali, 2019). It has unique characteristics compared to large aquatic ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Aquatic insects for monitoring the health status of riverine potholes: A case study in Chalakudy river basin, Kerala, India

Athulya,

Prasad,

Sivalingam

et al. 2024

Environ Monit Assess

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Potholes are microhabitats in riverine ecosystems, which contribute substantially to the unique regional faunal diversity and community composition. The potholes of riverine habitats of Kerala are less explored, thus this study is of signi cant importance for riverine health assessment using entomological indicators. A total of 18 potholes were identi ed from the two stations located in the Chalakudy river basin according to their vertical pro le. Insects were sampled monthly along with water quality parameters. We could identify 208 individuals represented by 15 families in the Athirappilly (S1). Among the collected taxa Ephemeroptera was the dominant order comprised of 48.56% of the population. Only 94 individuals represented by 10 families reported from the Ezhattumugham (S2). Hemiptera was the dominant order and comprised 51.06% of the total taxa collected. Benthic metrics such as family biotic index (FBI), % of Ephemeroptera Plecoptera, Trichoptera taxa (EPT), % of Ephemeroptera taxa, and % of tolerant organisms indicated remarkable variation in water quality status among the two stations and there was a signi cant difference in benthic metrics (p < 0.05). Major functional feeding groups reported, the percentage contribution of predators (p = 0.010), shredders (p = 0.009), and scrappers (p = 0.007) exhibited statistically signi cant variations between stations. Insects belonging to the families of Baetidae, Ephemeridae, Perlidae, and Stenopsychidae were found to be the most sensitive forms reported from the S1 indicates good water quality condition. Contrastingly, insects belonging to the families of Micronectidae, and Chironomidae being pollution-tolerant taxa, were abundant at S2 indicates a fairly poor condition of the potholes.

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“…Forms, process and related fluvial landforms of Indian system and sub system of rivers are quite different. Many of Plateau rivers in India developed river bed potholes (Dhali & Biswas, 2017a, 2017b) by response to geological control, their seasonal hydraulic behaviour and erosion zone are different (Dhali & Sahana, 2017). Rivers Gish, Lish, Chel, Mal, Neora, and Murti drain the present sub-Himalayan piedmont zone of North Bengal (Ayaz, Biswas, & Dhali, 2018) and their formprocesses are directly related to tectonic control.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal profiles and geomorphic indices analysis on tectonic evidence of fluvial form, process and landform deformation of Eastern Himalayan Rivers, India

Ayaz

Dhali

2019

Geology, Ecology, and Landscapes

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The drainage pattern and the morphology of the piedmont zone of the Himalayas are clear indicators of the active orogenic belt of most recent origin formed by the collision of Indian and Eurasian plate. The foothills of the Himalayas in West Bengal are zones of active tectonics drained by the rivers belonging to the Brahmaputra system. The present study is conducted for the left bank tributaries and sub-tributaries of Tista which bear the imprint of active tectonics of the region as they lie in the zone of Himalayan Frontal Fault, the most active thrust belt of Himalayas. Data and subsequent field experiences which showed that the region is constantly acted upon by recent diastrophism. Various tectonic indices were calculated to evaluate the evidence of tectonism. This include hypsometric integral (HI), fractal dimension (FD), basin asymmetry factor (AF), basin shape index (Bs), stream-length gradient (SL), mountain front sinuosity (Smf) and valley-floor width to valley height ratio (Vf). The results of these indices are used to prepare an index of active tectonics with three classes which is represented in a map. Then the field evidences of deformed landscape are matched with the areas showing high tectonic index values.

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MCA on mechanism of river bed potholes growth: a study of middle Subarnarekha River basin, South East Asia

Cited by 11 publications

References 33 publications

Formation, Migration, and Morphodynamic Alteration of 50 Channel Bars in Darjeeling Himalayan Piedmont Zone, India

Formation, Migration, and Morphodynamic Alteration of 50 Channel Bars in Darjeeling Himalayan Piedmont Zone, India

Aquatic insects for monitoring the health status of riverine potholes: A case study in Chalakudy river basin, Kerala, India

Longitudinal profiles and geomorphic indices analysis on tectonic evidence of fluvial form, process and landform deformation of Eastern Himalayan Rivers, India

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