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Interpolation of Tidal Levels in the Coastal Zone for the Creation of a Hydrographic Datum

Turner, J.F.; Iliffe, J.C.; Ziebart, M.K.; Wilson, C.; Horsburgh, K.J.. 2010 Interpolation of Tidal Levels in the Coastal Zone for the Creation of a Hydrographic Datum. Journal of Atmospheric and Oceanic Technology, 27 (3). 605-613. 10.1175/2009jtecho645.1

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Abstract/Summary

As part of the U. K. Hydrographic Office (UKHO)-sponsored Vertical Offshore Reference Frames (VORF) project, a high-resolution model of lowest astronomical tide (LAT) with respect to mean sea level has been developed for U.K.-Irish waters. In offshore areas the model relies on data from satellite altimetry, while in coastal areas data from a 3.5-km-resolution hydrodynamic tide-surge model and tide gauges have been included. To provide for a smooth surface and predict tidal levels in unobserved areas, the data have been merged and interpolated using the thin plate spline method, which has been appropriately tuned by an empirical prediction test whereby observed values at tide gauges were removed from the solution space and surrounding data used to predict its behavior. To allow for the complex coastal morphology, a sea distance function has been implemented within the data weighting, which is shown to significantly enhance the solution. The tuning process allows for independent validation giving a standard error of the resulting surface of 0.2 m for areas with no tidal observations

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1175/2009jtecho645.1
Programmes: Oceans 2025 > Climate, ocean circulation and sea level
ISSN: 0739-0572
Additional Information. Not used in RCUK Gateway to Research.: The authors acknowledge the contribution to this study by the United Kingdom Hydrographic Office, through funding and provision of data. Parallel computing facilities were provided by the UCL Computing Resource Allocation Group (CRAG). Further tide gauge data were provided by the National Tidal and Sea Level Facility (NTSLF) and Permanent Service for Mean Sea Level (PSMSL), both hosted by POL.
Additional Keywords: TIDE GAUGES; DATUM
NORA Subject Terms: Marine Sciences
Date made live: 12 May 2011 13:43
URI: http://nora.nerc.ac.uk/id/eprint/13956

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