Modelling of scour depth in the existing bridge piers with and without an adjacent parallel bridge Online publication date: Mon, 03-Feb-2025
by Biswajit Dalal; Subhrajyoti Deb
International Journal of Hydrology Science and Technology (IJHST), Vol. 19, No. 2, 2025
Abstract: This paper presents a hydraulic simulation conducted to assess the stability of the 'Netaji Subhas Bridge' on the Gomti River in Tripura. The simulation takes into account different scour profiles and numerous flood events. The calculation of local scour at various piers takes into account four different flow profiles: PF1 (1,495 m3/s), PF2 (1,147 m3/s), PF3 (711 m3/s) and PF4 (475 m3/s). The analysis of the HEC-RAS model reveals that the scour depth (Ys) and the Froude's number (Fr) exhibit a decrease for all flow profiles when a parallel bridge is constructed upstream of the existing bridge. However, if the new bridge is constructed on the downstream side, then Ys and Fr are increased for PF2, PF3 and PF4, but in the case of PF1, only the Ys decreased. Therefore, the safer and more serviceable option is to construct the parallel bridge on the upstream side of the existing bridge.
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