Integrated Flow-Wave-Sediment Modeling At Tamsui Estuary With Srh-2d Coast

Large cities have been built at river mouths where rivers meet the ocean. Such estuary and near-coast areas are subject to high wind, heavy precipitation, severe tides and storm surges, and high waves during a storm event. Storm-induced hazards are numerous, such as flood, shoreline erosion, beach and bay sediment movement, and infrastructure damage. An understanding of the water and sediment characteristics in the estuary and near-shore coastal areas is critical in protecting the coastal infrastructure and ecosystem. Often, numerical models are used to predict the water flow, wave behavior and sediment dynamics.

In this study, a newly developed SRH-2D Coast model is demonstrated by applying the model to the Tamsui River Estuary, Taiwan, under three typhoon events. The objective is to introduce the model, demonstrate its capability, and verify its usefulness for a practical case. A new third-generation wave model is developed with several novel features; a special sediment transport module is implemented, taking into account the combined flow and wave actions; and they are then integrated into the existing flow and sediment transport model SRH-2D. The model application to the Tamsui River Estuary is presented, along with verification results compared and model performance discussed. Satisfactory comparison of the model results with the field data is demonstrated.