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The tidal range is the vertical difference between the high tide and the succeeding low tide. Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth.
Figure 1: Tidal range â vertical difference in height between consecutive high and low waters. Spatially, tidal range varies according to the hydrodynamic response of a particular ocean basin, shelf sea, bay or estuary to astronomical tidal forcing.he range of the tide varies between locations and also varies over a range of time scales. Differences in tidal range are important, as they are often related to variations in coastal processes and morphology.