Low-Frequency Seiche in a Large Bay
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Short-term observations of sea surface elevations h along the 10-m isobath and long-term observations inside and outside of a large bay (Monterey Bay, CA) were obtained to describe the nodal structure of the modes 0–3 seiches within the bay and the low-frequency (,346 cpd) seiche forcing mechanism. The measured nodal pattern validates previous numerical estimates associated with a northern amplitude bias, though variability exists across the modal frequency band, particularly for modes 0 and 1. Low-frequency oceanic h white noise within seiche frequency bands (24–69 cpd) provides a continuous resonant forcing of the bay seiche with a h2 (variance) amplification of 16–40 for the different modes. The temporal variation of the oceanic h white noise is significantly correlated (R250.86) at the 95% confidence interval with the bay seiche h that varies seasonally. The oceanic h white noise is hypothesized as being from low-frequency, free, infragravity waves that are forced by short waves.
The article of record as published may be found at http://dx.doi.org/10.1175/JPO-D-14-0169.1
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