A STUDY OF RIVER MORPHOLOGICAL ANALYSIS OF BRAHMAPUTRA RIVER FROM DIBRUGARH TO MAJULI ISLAND

Abstract

The braided alluvial streams have a complex geometry posing difficulties in flow situation. This study has attempted to describe the braiding phenomenon, alluvial erosion and deposition of the Brahmaputra. river. Plan Form Index reflects the fluvial land form deposition and its lower value indicates higher degree of braiding. Cross-section no. 44 processes 21 numbers, of sub-channels for the year 1957 which -is the highest among the all sections in the study reach, which has the minimum, plan Form Index. Alluvial river bed profile does not follow any certain rule with respect to time and space. Modeling of river bed profile has always a challenge to the engineers and research workers in the field of river engineering. The river cross-section profiles are irregular in shape and size making it quite difficult to represent mathematically. The use of shape function has been tried in the model for interpolating cross-section profile and found better representation of the complex profiles.