Low-Frequency Seiche in a Large Bay
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Authors
MacMahan, Jamie
Subjects
Advisors
Date of Issue
2015-04
Date
Publisher
Language
Abstract
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.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1175/JPO-D-14-0169.1
Series/Report No
Department
Oceanography
Organization
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NPS Report Number
Sponsors
This work originated from the
Littoral Field Studies class within the OC department at
the NPS. Pressure sensors were obtained from an ONR
DURIP (N0001409WR20268). JM was supported by
ONR (N0001414WX20353), NSF (OCE-0926750), and
NPS.
Funder
Format
Citation
Journal of Physical Oceanography, Volume 45, pp. 716-723, March 2015.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.