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. Consequences of tidal dynamics on hydro-sedimentary processes are a recurrentissue in estuarine and coastal processes studies, and accurate tidalsolutions are a prerequisite for modeling sediment transport, especially inmacro-tidal regions. The motivation for the study presented in thispublication is to implement and optimize a model configuration that willsatisfy this prerequisite in the frame of a larger objective in order to study thesediment dynamics and fate from the Red River Delta to the Gulf of Tonkin froma numerical hydrodynamical–sediment coupled model. Therefore, we focus onthe main tidal constituents to conduct sensitivity experiments on thebathymetry and bottom friction parameterization. The frequency-domain solveravailable in the hydrodynamic unstructured grid model T-UGOm has been usedto reduce the computational cost and allow for wider parameter explorations.Tidal solutions obtained from the optimal configuration were evaluated fromtide measurements derived from satellite altimetry and tide gauges; the useof an improved bathymetry dataset and fine friction parameter adjustmentsignificantly improved our tidal solutions. However, our experiments seem toindicate that the solution error budget is still dominated by bathymetryerrors, which is the most common limitation for accurate tidal modeling.

Sensitivity study on the main tidal constituents of the Gulf of Tonkin by using the frequency-domain tidal solver in T-UGOm