A 2D Hydrodynamic Model Study in Brahmaputra River for Implementation of Bank Protection Work at Nimatighat

Abstract

AbstractThe morphological characteristics in a natural channel are widely affected by its sediment transport capacity. There are various possible reasons which may imbalance the sediment supply and transport rates and alters the flow dynamics in the channel. River Brahmaputra is associated with the problems of bank erosion, deposition of sediments, rapid bed aggradations, and drainage congestions and flooding from decades. Channel dredging is a possible method that can be implemented in the vulnerable reaches to remove the accumulated sediments and provide sufficient flow depth in the channel for navigation as well as for the safe passage of flood waves. Dredging in the channel improves the bed slope, increases the flow area and results in quick disposal of water during the high flow period. In this work, river hydraulics near the eroded bank is evaluated using a two-dimensional hydrodynamic model by considering three possible dredging widths in the channel along with a series of permeable spurs. The suitable alternative out of the proposed methods is selected based upon the computed parameters.KeywordsDredgingPermeable spursTwo dimensional hydrodynamic model