What are types of Tides?

Diurnal Tidal Pattern

A diurnal tidal pattern has a single high and low tide each lunar day. These tides are common in shallow inland seas such as the Gulf of Mexico and along the coast of Southeast Asia. Diurnal tides have a tidal period of 24 hours 50 minutes.TIDE

In short we can say: Diurnal

  1. One high tide/one low tide per day
  2. Rarest
Semidiurnal Tidal Pattern

A semidiurnal tidal pattern has two high tides and two low tides each lunar day. The heights of successive high tides and successive low tides are approximately the same.11 Semidiurnal tides are common along the Atlantic Coast of the United States. The tidal period is 12 hours 25 minutes.TIDE 1

In short we can say: Semidiurnal

  • Two high tides/two low tides per day
  • Tidal range about same
Mixed Tidal Pattern

A mixed tidal pattern may have characteristics of both diurnal and semidiurnal tides. Successive high tides and/or low tides will have significantly different heights, a condition called diurnal inequality. Mixed tides commonly have a tidal period of 12 hours 25 minutes, but they may also exhibit diurnal periods. Mixed tides are the most common type in the world, including along the Pacific Coast of North America.TIDE 2

In short we can say: Mixed

  • Two high tides/two low tides per day
  • Tidal range different
  • Most common
Spring tide :

During the times of new and full Moon. With the Earth, Moon, and Sun lying approximately on the same line, the attractive forces of the Sun are acting in the same direction as the Moon’s attractive forces (modified by declination effects). The resultant tides are called spring tides, whose ranges are greater than average.sp 3

Neap  tide :

Between the spring tides, the Moon is at first and third quarters. At those times, the attractive forces of the Sun are acting at approximately right angles to the Moon’s attractive forces. The results are tides called neap tides, whose ranges are less than average

spring tide 2


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