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Simulation study for channelization of the brahmaputra river in Assam
, A. Ashagrie
Published in
Volume: 69
Issue: 6
Pages: 30 - 36
Brahmaputra river system is very complex because of its braided flow pattern and high sediment load. It is one of the most braided river in the world in which the width of the river extends up to 22 km. The first part of the study includes developing a mathematical model for the river. Sediment transport capacity of the river has been done by using different method of transportation functions like Ackers-White, Yang and Engelnd-Hansen methods. The result shows that Yang's method of transportation function gives a better result for Brahmaputra River when it is compared with the other transportation functions. From these transportation functions Ackers-White method of transportation function gives high value of sediment transport capacity and high value of change in channel invert. The second part of the study is to channelize the river by putting river training structures at selected nodal points. These nodal points are selected based on the channel geometry and property in which channelization of the river can be possible. Some cross sections of the river are much braided in nature and it may not be economical to confine the flow over the whole reach of the river. Flow guide bunds are adopted as a river training structure which used to confine and guide the flow to a gentle channel. Especially these structures are constructed on the banks of the river at bridge site locations to guide and confine flow. Other structures which are adopted as channelization work are closing of secondary channels by putting bed bars, permeable spurs, porcupine screens, Jack Jetty etc.
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