How does tidal range affect the area of coast exposed to wave action?

The tidal range plays a critical role in determining the area of the coast exposed to wave action by shifting the position of the shoreline as the tide rises and falls. This movement effectively redistributes wave energy across the shore zone.1

The extent of this impact depends on both the tidal range and the local coastal topography:

• Topographical Influence: On steep features like cliffs, a large tidal range results in only a nominal change in the area subjected to wave energy.1
• Gently Sloping Coasts: In contrast, on broad, gently sloping beaches or tidal flats, a significant tidal range can cause the shoreline to shift by as much as one kilometre during a single tidal cycle, drastically increasing the area exposed to wave-driven erosion and sediment transport.1

Ultimately, the greater the tidal range, the more significant the effect on the distribution of wave energy across the coastal zone.1