Introduction to tides

The tide is caused by the gravitational pull of the Moon and Sun on the oceans of the Earth

While gravity provides the driving force, the rotation of the Earth, the size and shape of the ocean as well as local factors all affect the size and frequency of the tide at a particular place.

This section provides a basic understanding of tidal theory and a description of the different types of tides found in New Zealand.

Last Updated: 21 December 2015