Determining process of occasional flooding from channel hydrological characteristics of Chel Basin, North Bengal (India)

Ghosh, Debarshi

doi:10.1007/s41324-019-00290-0

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…1a). In July 2007, two high rainfall events of 293.62 mm (10th July) and 390.398 mm (6th September) are identical (Ghosh 2020).…”

Section: Discussionmentioning

confidence: 95%

“…The climate in the piedmont is subtropical monsoonal of the Cwa type and Cwb type at the highest elevations of the mountain margin (Prokop et al 2020). The Gorubathan of Kalimpong district is the wettest place in whole West Bengal accounts for 5331.7 mm of average annual rainfall (Ghosh 2020). The high walls of Lesser Himalaya act as a mechanical barrier against the free flow of wet south-east monsoon wind.…”

Section: Introductionmentioning

confidence: 99%

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Avulsion potential modeling using integrated Fuzzy-AHP in lower catchment of Chel river of North Bengal, India

Ghosh¹,

Sarkar

2021

Model. Earth Syst. Environ.

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The paper aims to determine the potential avulsion zones on the piedmont segment of the Chel river basin. A total of 12 hydro-geomorphic causative variables have been selected considering the river basin's present geomorphological and hydrological characteristics. The analysis focused on spatial modeling considering Multi-Criteria Evaluation (MCE) technique. The paper's main contribution is to identify the active avulsion zones on the piedmont of Darjeeling Himalaya triggered by high monsoon rainfall (5479.3 mm maximum annual average). The model's input comes from high-resolution Digital Elevation Model (DEM) based on interpolated rasters, proximity rasters, and rainfall raster. The raster overlay inputs have been fuzzified to scale down within 0-1 and produce the final factor weights. The Analytical Hierarchic Process (AHP) checks the priorities judged by each variable's pair wise relative importance as a part of MCE. Finally, the model indicates that suitable sites on a continuous scale of suitability range between 0 and 1. The rainfall raster gets the highest weightage in the AHP priority scoring. The model correctly classified 85.7% of sites suitable to avulsion, and it has also been proven from the recent (2017-2020) field photographs. The Fuzzy-MCE technique has revealed the role of high rainfall in triggering avulsion on the piedmont surface. The final composite layer indicates the mountain outlet (junction of Chel, Manzing and Fagu Khola) as the most potential site for avulsion.

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“…1a). In July 2007, two high rainfall events of 293.62 mm (10th July) and 390.398 mm (6th September) are identical (Ghosh 2020).…”

Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Avulsion potential modeling using integrated Fuzzy-AHP in lower catchment of Chel river of North Bengal, India

Ghosh¹,

Sarkar

2021

Model. Earth Syst. Environ.

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“…21 North Bengal rivers of Himalayan foothill region gain their 'health' in monsoon time and carry large amount of coarse sediment especially Teesta, Torsa, and Jaldhaka. [22][23][24] New deposition and destruction of channel bars are much more active during July-August months of Indian subcontinent due to the interaction of varied geo-hydrological processes. But many of large, medium, and small rivers are affected by construction of dam, barrage, and bridge 17,[25][26][27][28] which strongly influence channel discharge, velocity, and rate of sediment transportation.…”

Section: Introductionmentioning

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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Dynamics of channel bar morphology on multi-decadal timescales in a braided river within Himalayan foreland basin, India

Ghosh,

Mandal,

Bera

2023

J Earth Syst Sci

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Determining process of occasional flooding from channel hydrological characteristics of Chel Basin, North Bengal (India)

Cited by 4 publications

References 27 publications

Avulsion potential modeling using integrated Fuzzy-AHP in lower catchment of Chel river of North Bengal, India

Avulsion potential modeling using integrated Fuzzy-AHP in lower catchment of Chel river of North Bengal, India

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

Dynamics of channel bar morphology on multi-decadal timescales in a braided river within Himalayan foreland basin, India

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