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Global Ocean Tide Models: Assessment and Use within a Surface Model of Lowest Astronomical Tide

Turner, JF; Iliffe, JC; Ziebart, MK; Jones, C; (2013) Global Ocean Tide Models: Assessment and Use within a Surface Model of Lowest Astronomical Tide. Marine Geodesy , 36 (2) 123 - 137. 10.1080/01490419.2013.771717. Green open access

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Abstract

The UK Hydrographic Office (UKHO)-sponsored Vertical Offshore Reference Frames (VORF) project aims to develop tidal level transformation models that are referenced to the GRS80 ellipsoid and thus compatible with GNSS positioning; in particular, heighting. Benefits include increasing the efficiency of hydrographic surveying, providing a stable consistent reference frame and enabling integration with land data in the coastal zone. Seven contemporary global ocean tide models are used to derive Lowest Astronomical Tide (LAT) surfaces which are each assessed by comparison with LAT values from the 7,389-strong UKHO tide gauge database, with the results correlated with distance from land. The proportion of truly offshore and pelagic gauges is relatively limited; however, the transition zone whereby the global ocean tide models commence to deteriorate in accuracy is evident at approximately 30km from the coast. The DTU10 model was selected as the strongest candidate overall. Subsequently, a thin plate spline method is used with the tide gauge dataset to enhance the DTU10 LAT surface in the coastal zone, creating a high resolution global LAT surface with respect to mean sea level. It is seen by cross-validation that the method may be used to predict LAT in near-shore locations with a standard error of 0.23 m.

Type: Article
Title: Global Ocean Tide Models: Assessment and Use within a Surface Model of Lowest Astronomical Tide
Open access status: An open access version is available from UCL Discovery
DOI: 10.1080/01490419.2013.771717
Publisher version: http://dx.doi.org/10.1080/01490419.2013.771717
Language: English
Additional information: © James Turner, Jonathan Iliffe, Marek Ziebart, Christopher Jones. This is an open-access article distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The moral rights of the named author(s) have been asserted.
Keywords: Ocean tide models, lowest astronomical tide, thin plate spline, offshore reference frames, chart datum, hydrographic surveying, GNSS positioning
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1397707
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