Tidal and Long-term Volume Transport Through Jewfish Creek, Florida Keys
Abstract:A 14-mo current meter record together with channel calibration measurements are used to investigate the dynamics of long-term volume transport through Jewfish Creek, the main channel connecting Blackwater Sound in northeastern Florida Bay with Barnes Sound, a southern extension of Biscayne Bay. Seasonal variations dominate the long-term flow through this channel as water generally flows into Blackwater Sound during fall, winter and early spring months, then out of the sound in late spring and summer. Low-frequency reversals occur over time scales of several days to about 2 wks throughout the study period. Flow into or out of Florida Bay typically averaged ±30–50 m3 s–1 over these time scales. Low-frequency motions account for 80% of the total variance in a long-channel volume transport. Harmonic analysis quantifies the amplitude of the dominant M2 tidal constituent at 27 m3 s–1 and over half of any M2 tidal cycle 380 × 103 m3 of water moves past the study site. Water level records indicate that the tidal transport is forced by Atlantic tides entering Barnes Sound through Biscayne Bay; Blackwater Sound is virtually tideless. Low-frequency flow through the channel is driven by a broad range of wind stress components acting to create water level differences between the two subbasins. Water level is most responsive to the 030–210° wind stress component and over all time scales between about 2 d and 4 wks this component of wind stress accounts for 50–85% of the total variance in water level differences between Barnes Sound and Blackwater Sound. These water level differences explain 88% of the variance in low-frequency flow through Jewfish Creek.
Document Type: Research Article
Publication date: November 1, 1998
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