Subtidal sea level and current variations in the northern reach of San Francisco Bay |
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Authors: | Roy A. Walters Jeffrey W. Gartner |
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Affiliation: | 1. U.S. Geological Survey, 1201 Pacific Ave., Tacoma, WA 98402, U.S.A.;2. U.S. Geological Survey, MS 496, Menlo Park, CA 94025, U.S.A. |
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Abstract: | Analyses of sea level and current-meter data using digital filters and a variety of statistical methods show a variety of phenomena related to non-local coastal forcing and local tidal forcing in the northern reach of San Francisco Bay, a partially mixed estuary. Low-frequency variations in sea level are dominated by non-local variations in coastal sea level and also show a smaller influence from tidally induced fortnightly sea level variations. Low-frequency currents demonstrate a gravitational circulation which is modified by changes in tidal-current speed over the spring-neap tidal cycle. Transients in gravitational circulation induce internal oscillations with periods of two to four days. |
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Keywords: | estuaries sea level currents estuarine circulation subtidal variations San Francisco Bay |
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