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Estimation of slack tide using GPS measurements on a buoy / M. Valk (2011)    

Public Titre : Estimation of slack tide using GPS measurements on a buoy : A case study on buoy 18 in the Schelde Estuary Type de document : Mémoire Auteurs : M. Valk, Auteur Editeur : Delft [Pays-Bas] : Delft University of Technology Année de publication : 2011 Importance : 136 p. Format : 21 x 30 cm Note générale : bibliographie Master of Science Thesis for obtaining the degree of Master of Science in Geomatics Engineering at Delft University of Technology Langues : Anglais (eng) Descripteur : [Termes IGN] Belgique [Termes IGN] bouée [Termes IGN] données GPS [Termes IGN] estuaire [Termes IGN] marée océanique [Termes IGN] Pays-Bas [Termes IGN] rivière Index. décimale : MX Mémoires divers Résumé : (auteur) In this thesis, a method is developed to estimate the moment of slack tide based on GPS measurements on a buoy. The moment of slack tide is the very moment the tidal current changes direction. The method is applied in the Schelde Estuary in the Netherlands. An estuary is the transition between two distinct water bodies: a river and a sea. Estuaries are very important as a transport link and a source of food. Interventions in the estuary bathymetry, like dredging, can have severe impact on the hydraulic behavior of the estuary. Knowledge of the physical phenomena that determine the tidal flow is important as they influence the environment of an estuary in many ways. One of the key parameters in tidal propagation is the phase lag, which is the difference in time between high or low water and the subsequent moment of slack. The main objective of this thesis is to estimate the moment of slack tide based on GPS measurements on a buoy ultimately with an accuracy in the order of 5-10 minutes. The buoy, which is used as an aid to navigation, is floating on the water and tied to the sea floor by a heavy anchor chain. In order to achieve this goal it is necessary to: investigate the performance of different GPS receivers in combination with different antennas and operating modes; analyze the motion of the buoy during several tidal cycles; develop a method to estimate the moment of slack tide based on GPS measurements on a buoy; and, investigate whether the results could be further improved by employing a Kalman filter that combines knowledge about the dynamics of the buoy and series of measurements over time as opposed to a single epoch slack tide estimation. […] Note de contenu : 1- Introduction 2- Background 3- Materials and methods 4- Results and discussion 5- Conclusions and Recommendations Numéro de notice : 14867 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Mémoire masters divers En ligne : http://resolver.tudelft.nl/uuid:11a3bbc4-5013-4833-871d-1035fca04636 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75856

Documents numériques

en open access 14867 MEM MS 2011 Vlak Adobe Acrobat PDF