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Methods of tidal loading computation / Trevor Baker in Bulletin international des marées terrestres, n° 94 (juin 1985)
[article]
Titre : Methods of tidal loading computation Type de document : Article/Communication Auteurs : Trevor Baker, Auteur Année de publication : 1985 Article en page(s) : pp 6365 - 6373 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] marée océanique
[Termes IGN] marégraphie
[Termes IGN] masse de la Terre
[Termes IGN] perturbation
[Termes IGN] surcharge océaniqueRésumé : (Auteur) A general review is given of the various methods that have been used for tidal loading computations. An expansion of the ocean tide distribution into surface spherical harmonics and then a summation with an appropriate combination of load Love numbers is useful when only the lowest degree terms are involved, as for example in calculating the tidal perturbations of artificial satellites or the loading response due to the oceans at distances greater than about 1500 km. For load calculations at any distance from the coast, methods have been developed which involve calculating the response of the Earth to loads that are uniform over a limited area or cell. These cells can be either polygons, templates or discs. These should all give equivalent results provided that care is taken in choosing the size of the cells, particularly for the nearest sea area where the Earth's response, the marine tide (and the coastal geometry) are all varying rapidly with distance. If a cell has dimensions of order 2°C. , then the load response of the Earth at distances greater than 10°C from the cell becomes the same as the response due to an equivalent point mass load acting at the centre of the cell. Thus, if the cell size relative to the distance from the observation site is suitably chosen, then the computation reduces to the summation of the effects due to a set of point mass loads. The overall accuracy of a tidal loading computation is mainly determined by the uncertainties in the shelf and ocean tide models used (including that arising from the mass conservation problem) Numéro de notice : A1985-120 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33416
in Bulletin international des marées terrestres > n° 94 (juin 1985) . - pp 6365 - 6373[article]