 Tidal range

The tidal range is the difference in sea-surface height between a specified high tide and the neighboring low tide, measured relative to the same datum. A high-water level of $4.2\mathrm{m}$ and low-water level of $1.1\mathrm{m}$ give a range of $3.1\mathrm{m}$.

For a sinusoidal tide $\eta (t)=A\cos \omega t$, the range is $2A$, not the amplitude $A$. Interference between lunar and solar tidal contributions produces larger spring ranges and smaller neap ranges. Coastline geometry, water depth and resonance modify the local response, so the tidal range cannot be inferred from astronomical forcing alone.

Tidal range refers to the vertical difference in water level between high tide and low tide in a specific location. It is a measure of the amplitude of the tide and can vary significantly depending on various factors such as geographical location, the shape of the coastline, the presence of estuaries or bays, and the alignment of the Earth, moon, and sun. Tidal range can be classified into three categories: 1. **Microtidal**: Tidal ranges of 0.