Morphology Changes of Ganga River over Time at Varanasi
Journal Title: Journal of River Engineering - Year 2014, Vol 2, Issue 2
Abstract
The morphology of a river can be viewed conveniently by considering its long profile and cross profile. The degrees of freedom of a river consist of the width, depth, channel slope, bank slope and geo-morphological condition in the zone where the river flows. As water flows along the channel of a river, its long profile will be determined by several factors, which include geological condition, different hydraulic structure made in the channel, discharge and velocity. Alluvial rivers are self-regulatory in that they adjust their characteristics in response to any change in the environment. An alluvial river is unconstrained, in the long term, in developing its stable width to which the depth, slope, velocity, and flow resistance are closely related. Meandering channels is a vast research field, spanning a broad variety of time and space scales, environmental domains, and conceptual and methodological approaches. The present study has been carried out on the river Ganga at Varanasi for calculating amount of meandering in the form of change of sinuosity at two consecutive bends. For this purpose 10 years of satellite imagery data has been analysed of the Ganga River using Arc GIS combined with historical data. The result shows that sinuosity varies from 1.66 to 1.26 and silt deposition of two bends varies from 4.52 to 3.14 and 3.4 to 2.42 respectively.
Authors and Affiliations
sabita madhvi singh
Keywords
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