The simulations in this dataset were designed to explore the potential limiting effects of wave height and tidal range on delta formation, with results demonstrating that large enough combinations of these processes may prevent deltas from forming. Simulations use the open source model Delft3D. 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). Data outputs include velocities, depths, sediment concentrations, and wave conditions, amongst others. Simulations represent either 36 or 72 years of morphological development.