Salinity levels in river deltas are expected to rise due to sea level increase, which can harm agriculture and water quality. Tidal patterns play a crucial role in controlling salinity levels in deltas. By using computer models, researchers found that small increases in tidal amplitudes can help reduce salinity in river-dominated areas. However, higher tidal amplitudes can worsen salinity levels by decreasing freshwater areas. The shape of the river channels has a bigger impact on salinity levels than tidal patterns. This study shows how changes in tidal ranges can affect salinity distribution in river deltas.