| VDatum for the coastal waters of Puerto Rico and the U.S. Virgin Islands : tidal datums, marine grid, and sea surface topography - :2666 | National Ocean Service (NOS)
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VDatum for the coastal waters of Puerto Rico and the U.S. Virgin Islands : tidal datums, marine grid, and sea surface topography
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VDatum for the coastal waters of Puerto Rico and the U.S. Virgin Islands : tidal datums, marine grid, and sea surface topography
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  • Description:
    "VDatum, a software tool for vertical datum transformations, is developed for providing spatially-varying conversions between tidal, orthometric, and ellipsoid-based three-dimensional reference frames. The present study is focused on establishing vertical datum transformations for an area covering the coastal waters of Puerto Rico and the U.S. Virgin Islands. To support VDatum, gridded fields with the conversions among various tidal datums, mean sea level and the Puerto Rico Vertical Datum of 2002 (PRVD02) or the Virgin Island Vertical Datum of 2009 (VIVD09) were generated. The tidal datums were derived from tidal simulations using the finite element hydrodynamic model ADCIRC. An unstructured triangular grid consisting of 274,885 nodes and 522,334 cells was created for the model simulations. The model was forced by a reconstructed tide at the ocean boundary using the harmonic constants of nine tidal constituents (M 2 , S 2 , N 2 , K 2 , K 1 , O 1 , P 1 , Q 1 , and M 4 ) from the global tidal model TP XO7.2. Hydrodynamic conditions were simulated for 40 days. The 6-minute water level time series from the last 32 days of the simulation were used to derive various tidal datum fields, including Mean Higher High Water (MHHW), Mean High Water (MHW), Mean Low Water (MLW), and Mean Lower Low Water (MLLW). Model-derived tidal datums were compared with the observations at 33 water level gages maintained by NOAA's Center for Operational Oceanographic Products and Services (CO-OPS). The root mean square error (RMSE) for all tidal datums was 1.2 cm. To reduce this error, a two-dimensional correction field was constituted by spatially interpolating the error values at each tide station onto the model grid using Tidal Constituent And Residual Interpolation (TCARI), a spatial interpolation tool based on solution of Lapl ace's equation. The correction fields were then added to the modeled tidal datums to derive the corrected tidal datums on the model grid. These corrected tidal datums were further interpolated from the unstructured triangular grid onto a regularly structured marine grid to be used by the VDatum software"

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