Abstract

A spur dike is mainly constructed as a river-training structure and is primarily used to prevent bank erosion. The restriction to flow caused by the construction of spur dike, promotes local scour around the structure. In the case of a dike placed in a channel bend, the scour becomes more aggressive. The literature review found that the research work related to local scour around spur dike located in a meandering channel is very limited or minimal. Therefore, an experimental investigation is conducted to study the local scour process around a T-shaped spur dike placed at different locations along the outer bank (or concave) of a reverse-meandering channel. Non-dimensionalized empirical equations for temporal and maximum local scour depth are developed as the function of the Froude number of approach flow, spur dike location. It is observed that local scour around the dike increases with the increase in Froude number, and location in the meander (measured from the entry to meander). The formulation for the maximum scour depth is further evaluated with the experimental data related to the 180° bend, from literature, and found that the proposed equation's application is very much limited.

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