Influence of Wave–Current Interaction on a Cyclone-Induced Storm Surge Event in the Ganges–Brahmaputra–Meghna Delta: Part 1—Effects on Water Level

The Ganges–Brahmaputra–Meghna Delta (GBMD) located in the head of Bay Bengal is regularly affected by severe tropical cyclones frequently. GBMD covers Bangladesh coast, which one most vulnerable areas world due to cyclone-induced storm surges. More than 30% total country’s population lives on coast. Hence, it crucial understand underlying processes that modulate surge height GBMD. A barotropic numerical 3D model setup established using Delft3D and SWAN investigate a event. calibrated validated for Cyclone Sidr 2007 applied six idealized cyclonic scenarios. Numerical experiments with different coupling configurations are performed distinguish contribution wind, tides, waves, wave–current interactions (WCI) height. Results show wind-driven dominant contributor during events. Based tidal phase wind direction, interaction between tide can increase or decrease magnitude Finally, considering wave may up 0.3 m along coastline through strong setup.