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|Computation and approximation of the length scales of harmonic modes with application to the mapping of surface currents in the Gulf of Eilat|Lekien, F.; Gildor, H. (2009). Computation and approximation of the length scales of harmonic modes with application to the mapping of surface currents in the Gulf of Eilat. J. Geophys. Res. 114(C6). dx.doi.org/10.1029/2008JC004742
In: Journal of Geophysical Research. American Geophysical Union: Richmond. ISSN 0148-0227; e-ISSN 2156-2202, meer
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Open-boundary modal analysis (OMA) is a generalized Fourier transform that interpolates, extrapolates, and filters scattered current measurements and produces smooth current maps in coastal areas. Boundary conditions are enforced by adjusting the OMA modes to the coastline. Filtering is achieved by discarding OMA modes whose length scales are below a selected threshold. In this paper, we determine the length scale of the OMA modes, and we derive approximated formulas. Operational use of the OMA modes and the length scale formulas are illustrated on surface currents measured by high-frequency radar in the Gulf of Eilat (Gulf of Aqaba).