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- W2082363480 abstract "The excitation of coastal inertial oscillations by a rapidly varying wind is investigated. It is shown that the mean-square response to a completely random forcing is ϕ¯2 ∝ ∫ ϕδ2dt, where ϕδ is the response to impulsive forcing and the integral is over the record length. The rms response therefore initially increases with time as t½, and reaches stationarity in the decay scale for ϕδ. As in the random-walk problem, the t½ increase is a result of the superposition of uncorrelated steps. Continuous random forcing preferentially increases subsurface amplitudes, since the energy flux from the coast-surface corner causes a surface decay and a subsurface growth of ϕδ. With assumed parameters, a step-input wind forcing of 1 dyn cm−-2 generates inertial oscillations of 4 cm s−1 in the surface layer and 0.7–1.5 cm s−1 below. With a random wind in the range (−0.5, 0.5) dyn cm−2, the surface values increase to 8–11 cm s−1 and the subsurface values to 3–7 cm s−1. With an observed wind-forcing the surface and subsurface amplitudes are 10–17 cm s−1 and 5–9 cm s−1, respectively. Compared to the step-input wind, the oscillations due to a randomly varying wind are less coherent in the vertical and more intermittent in time." @default.
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- W2082363480 date "1984-12-01" @default.
- W2082363480 modified "2023-10-18" @default.
- W2082363480 title "Generation of Coastal Inertial Oscillations by Time-Varying Wind" @default.
- W2082363480 doi "https://doi.org/10.1175/1520-0485(1984)014<1901:gociob>2.0.co;2" @default.
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