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Global Astronomical M2 Tide

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This example tests ADCIRC version 55 (and beyond). It tests the simulation of the astronomical M2 tidal constituent on the spherical Earth under equilibrium tidal forcing with the inclusion of the self-attraction and loading tide. The results of interest are the M2 tidal constituent amplitudes and phases of elevations and velocities from the least-squares harmonic analysis. The test finishes in about 5 minutes in serial ADCIRC for a full month of simulation. Find the test at the GitHub test suite.


The mesh is a coarse representation of the spherical Earth with minimum resolution of approximately 50 km, comprised of 27,330 vertices and 50,859 triangular elements.

Options/Features Tested

  • ICS = -22: Uses the Mercator projection with a coordinate rotation to remove the pole singularity (need to provide a fort.rotm.
  • IM = 513113: Uses the fully implicit scheme for the gravity wave term (computational time step is 12 minutes).
  • NTIP = 2: equilibrium tide + self-attraction and loading tide forcing (read from a fort.24 file).
  • A00, B00, C00 = 0.5, 0.5, 0: Ensures that the fully implicit scheme is stable with a large time step.
  • ESLM = -0.2: enables the Smagorinsky turbulence closure with a coefficient of 0.2.
  • NHAGE = 5: outputs the harmonic constituent elevations into a netCDF4 fort.53 file.
  • NHAGV = 5: outputs the harmonic constituent velocities into a netCDF4 fort.54 file.
  • internal_tide_friction: spatially varying linear wave drag fort.13 file attribute accounting for energy conversion due to internal tide generation in the deep ocean.
  • quadratic_friction_coefficient: spatially varying quadratic bottom friction fort.13 file attribute.