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European Journal of Environmental Ecology

Volume 10, Issue 1, 2023
Mcmed International
European Journal of Environmental Ecology
Issn
XXX-XXXX (Print), 2393 - 9672 (Online)
Frequency
bi-annual
Email
editorejee@mcmed.us
Journal Home page
http://mcmed.us/about/ejee
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Abstract
Title
FINER BED LOAD CHARACTERISTICS AND CHANNEL MORPHOLOGY : A CASE STUDY OF A SELECTED REACH OF PANCHANOI RIVER, SUKNA OF DARJEELING DISTRICT, WEST BENGAL
Author
Subhadip Gupta*
Email
sg.birati@gmail.com
keyword
finer bed load, grain size, channel morphology.
Abstract
Panchnoi is a major right bank tributary of Mahananda River flowing through the Himalayan foothills in Darjeeling dist. The upper part of the catchment is situated in the hilly area but the lower part is on the alluvium fan surface. In this studied stretch, the Rongtong Khola, a major right bank tributary joins the Panchnoi. Detailed geomorphic mapping of the surveyed stretch was done by theodolite tachometry. The long profile and 39 cross profiles were drawn based on the surveyed data. 38 sediment samples were collected along the studied stretch. The finer bed load character reveals that the materials transported by river Panchnoi get more rounded with increasing distance downstream.A negative relationship can be observed between channel width and mean size of sediment and the kurtosis values. Up to the confluence of Panchnoi with Rongtong Khola, the grain size distribution is unimodal which indicates the dominance of a single depositional agent, but after the confluence till the end of the surveyed stretch, the grain size distribution is mainly bi-modal. This may indicate fluctuating energy condition of the depositing medium and the effect of mixing of bed load contributed by the tributary streams. Since the flow pattern of a river depends on the bed and bank morphology together with its competency and capacity, an attempted has been made in this study to study the geomorphic properties of the river with its bed load character by a micro level analysis.
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