296
extreme wave more recurrent has presented a height of 3.05 m, and a critical extreme
wave, which exceeds the 95%, comprises from the 3.59 m to the maximum height
register of 4.68 m.
9.4.3 The Astronomic Tide
The astronomic tide is defines as a group of regular movements of ascendants or
descendants sea level with periods of 12 or 24 h that are caused by the gravitational
attraction made by the moon and the sun on the Earth, as well as, the effect from
other planets. When there are investigations on the beach, or coastal studies are carried out, it is necessary to know the behaviour of the tide wave, especially for predicting its amplitude given that it is a determinist phenomenon. To approach the
study of its behaviour consists in considering the astronomic tide as the sum of a
finite number of waves, whose amplitude and phase are known; because of they
have been associated with planetary movement.
To the study, it is developed a decomposition through the astronomic analysis
considering The Earth, The Moon and the Sun movements, in order to determine the
relative frequency and importance of each one of components (Cartwright 2001).
Taking into account the tide amplitudes, it is possible to identify two types of tide:
spring and neap tide.
Fig. 9.16 Exceedance probability of wave height at virtual data series 11.5°N and −75°W. Time
period 01-jan-1979 a 31-jan-2014
G.D. Rivillas-Ospina et al.
extreme wave more recurrent has presented a height of 3.05 m, and a critical extreme
wave, which exceeds the 95%, comprises from the 3.59 m to the maximum height
register of 4.68 m.
9.4.3 The Astronomic Tide
The astronomic tide is defines as a group of regular movements of ascendants or
descendants sea level with periods of 12 or 24 h that are caused by the gravitational
attraction made by the moon and the sun on the Earth, as well as, the effect from
other planets. When there are investigations on the beach, or coastal studies are carried out, it is necessary to know the behaviour of the tide wave, especially for predicting its amplitude given that it is a determinist phenomenon. To approach the
study of its behaviour consists in considering the astronomic tide as the sum of a
finite number of waves, whose amplitude and phase are known; because of they
have been associated with planetary movement.
To the study, it is developed a decomposition through the astronomic analysis
considering The Earth, The Moon and the Sun movements, in order to determine the
relative frequency and importance of each one of components (Cartwright 2001).
Taking into account the tide amplitudes, it is possible to identify two types of tide:
spring and neap tide.
Fig. 9.16 Exceedance probability of wave height at virtual data series 11.5°N and −75°W. Time
period 01-jan-1979 a 31-jan-2014
G.D. Rivillas-Ospina et al.