Abstract
River channel is considered as a dynamic entity in the fluvial system. The Burhi Dihing river is an important south bank tributary of the river Brahmaputra, characterized by highly dynamic and unstable channel variations. The present study deals with the channel dynamics of river Burhi Dihing from Miau, Arunachal Pradesh to Dihingmukh, Assam using remote sensing techniques. Study of channel area, channel length, braiding index, sandbars and fill and erosion has been carried out for the period 1989-1999,1999-2008 and 2008- 2018 by dividing the study area into 6 grid at 15’ longitudinal interval. The river is witnessing more progression changes then regression changes as in last three decade the total amount of deposition done by the river is 3935.964 hectares whereas the total amount of erosion done by the river is only 1552.961 hectares. The area of the channel is decreasing from 102.78 sq km in the year 1989 to 78.949 sq km in the year 2018. During the last three decade, i.e. from 1989 to 2018 the river have has become more braided as in the year 1989 the B.I was 1.76 which have increased to 1.96 in the year 2018 as well as the total number of sandbars have also increased from 208 in the 1989 to 405 in 2018. The outcome of the study is obtained by using the Toposheet, LANDSET ETM image and Google earth images in QGIS 2.14 software.
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