A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

 

A

  • Absolute reference: Galilean reference frame (without acceleration).
  • Admittance: the ocean's response, depending on the frequency, to the action of the generating force.
  • Age of the tide: time interval between the syzygy and the maximum range of tide that follows.
  • ALLENVI: Environmental alliance.
  • Altimetry: measurement of the height of water using spatial techniques.
  • Amphidromic points: points located at sea around which the tide wave appears to turn.
  • Amplitude: difference between the height of a high or low tide and the mean level. This term is often used in error to designate the range of tide.
  • Apparent time: true solar hour angle.
  • Argument number: method for designating the components of the tide, using a 6-figure number, making it possible to identify the astronomical parameters from which they are derived and deduce from them their period.
  • Ascending node: point at which the lunar orbit and the ecliptic intersect in the direction of movement of the Moon from the Southern to the Northern hemisphere.

 

B

  • Backrush current: current generated by the slope of the free surface, excluding the action of the tide.

 

C

  • CCI:  Chamber of Commerce and Industry.
  • CEA/LDG: Commissariat à l'Energie Atomique et aux Energies Alternatives / Laboratoire de Détection et de Géophysique (Atomic energy and alternative energy commission / Detection and geophysical laboratory).
  • CENALT: Centre national d'alerte aux tsunamis (national tsunami alert centre)
  • CETE: Centre d'études techniques de l'équipement (equipment technical study centre).
  • CETMEF: Centre d'Etudes Techniques Maritimes Et Fluviales (maritime and fluvial technical study centre
  • CG: Conseil Géneral (county council)
  • CGC: Commission de gestion de configuration (configuration management committee)
  • CGEDD: Conseil général de l'environnement et du développement durable (general council for the environment and sustainable development)
  • Chart datum: same as hydrographic datum.
  • CIL: Correspondant Informatique et Libertés (data protection coordinator).
  • CIMER: Comité interministériel de la mer (interministerial committee for the sea)
  • Civil time: mean time plus 12 hours.
  • CNES: Centre National d'Etudes Spatiales (national space study centre)
  • CNRS: Centre National de la Recherche Scientifique (national scientific research centre)
  • Coefficient: measurement of the amplitude of the tide expressed relative to the unit of height.
  • Concordance; species concordance: tidal analysis and prediction technique using the relations between the elements of a standard port and those of a secondary port.
  • Cotidal line: line on a chart passing through all the points at which high tide occurs at the same time.
  • CR: Conseil Régional (regional council)
  • CRATANEM: Centre régional d'alerte aux tsunamis pour l'Atlantique Nord-Est et la Méditerranée (Regional tsunami alert centre for the North East Atlantic and Mediterranean)
  • Current amplitude: maximum speed during a tidal cycle.
  • Current atlas: cartographic representation of the tidal current fields at various times.

 

D

  • Damping well: Device in a tidal observatory designed to flatten the area of water and reduce rapid movements due to waves and swell.
  • DDE: Direction Départementale de l'Equipement (county council infrastructure directorate)
  • DDEA 14 / SRAN: Direction Départementale de l'Equipement et de l'Agriculture du Calvados / Service Réglementation et activités nautiques (county council infrastructure and agricultural directorate for the Calvados department / Regulatory and nautical activities department)DDTM: Direction Départementale des Territoires et de la Mer (county council territorial and maritime department)
  • Declination: angle between the celestial body and the equatorial plane.
  • DéGéOM: Délégation générale de l'Outre-Mer (general delegation for overseas territories)
  • DGEC/ONERC: Direction générale de l'énergie et du climat / Observatoire national sur les effets du réchauffement climatique (general directorate for energy and climate / National observatory of the effects of global warming)
  • DGM: Direction générale de la météorologie (Madagascar) (general directorate for meteorology (Madagascar))
  • DGPR: Direction générale de la prévention des risques (general directorate for risk prevention)
  • Diurnal tide: one high water and one low water per day; the semi-diurnal components are negligible.
  • DMS: Demande de mise en service (commissioning request)
  • DMSOI: Direction de la Mer Sud Océan Indien (Directorate for the Sea – Southern Indian Ocean)
  • Doodson number: another name for an argument number.
  • DRE: Direction régionale de l'Equipement (regional infrastructure directorate)
  • DREAL - LR: Direction régionale de l'environnement, de l'aménagement et du logement - Languedoc-Roussillon (regional directorate for infrastructure, development and housing – Languedoc-Roussillon)
  • Drift current: current generated by the wind.
  • DSC: Direction de la Sécurité Civile (directorate of civil safety).

 

E

  • Ebb current or ebb: current accompanying the ebb tide.
  • Ebb: synonym of falling tide.
  • Ecliptic latitude: angle between the celestial body and the ecliptic plane.
  • Ecliptic longitude: angle between the orthogonal projection on the ecliptic of the direction of the celestial body and the direction of the vernal point.
  • Ecliptic: the Earth's orbit around the Sun or the Sun's apparent orbit viewed from the Earth.
  • Ellipsoid: mathematical surface defining a geodetic system based on the relative positions of points located on the Earth's surface.
  • Equation of time: difference between the mean time and the true time. Species: set of components whose frequencies are close to a given number of cycles per lunar day. we distinguish between species with long periods, diurnal and semi-diurnal species.
  • Equator: terrestrial great circle contained within the plane perpendicular to the polar axis.
  • Equinoctial point: intersection of the ecliptic plane and the equator.
  • Equinoctial spring tide: maximum amplitude of the semi-diurnal tide around the equinoxes.
  • Establishment of the port: time (true time) of high water on a day on which syzygy occurs at apparent noon.
  • EuroGOOS: European Global Ocean Observing System
  • Exceptional spring tide: semi-diurnal perigean equinoctial spring tide.
  • Extended argument number: Doodson number to which a 7th figure has been added, specifying whether the angular argument is associated with a positive or negative sine or cosine.

 

F

  • Falling tide: period during which the water level falls.
  • FAQ: Frequently Asked Questions (or Foire Aux Questions in French)
  • FFT: Fast Fourier Transform. Technique for representing a time signal in the spectral domain.
  • Fix sphere: representation system in which reference is made to celestial bodies by their direction on a sphere whose position is fixed with respect to the stars.
  • Flood current or flood: current accompanying the rising tide.
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