This dataset includes model outputs of velocities, depths, sediment concentrations, and wave conditions, amongst others. The simulations model an idealised coast (19.75 km alongshore by 9 km cross-shore) and river (width 250 m by length 50 km) with constant discharge of water (1280 m3 s-1) and sediment (128 kg s-1), and with various combinations of significant wave height (up to 2 m) and tidal range (up to 6 m). They represent either 36 or 72 years of morphological development, starting from January 1, 2022. The simulations were generated using the open source model Delft3D. The data outputs were designed to explore the potential limiting effects of wave height and tidal range on delta formation. The results demonstrate that large enough combinations of these processes may prevent deltas from forming. Also included in the dataset are input files necessary to run the model code, and animations showing various processes over time in addition to bathymetry. The outputs were generated under the Natural Environment Research Council (NERC) Envision Doctoral Training Partnership (grant number: NE/S007423/1).