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Estuaries and Coasts

, Volume 35, Issue 6, pp 1500–1509 | Cite as

Interaction of Tidal and Fluvial Processes in the Transition Zone of the Santee River, SC, USA

  • Alexander E. YankovskyEmail author
  • Raymond Torres
  • Legna M. Torres-Garcia
  • Kyungho Jeon
Note

Abstract

This study was conducted in the freshwater reach of the Santee River approximately 55 ± 4 km from the mouth, a transition zone from a fluvial to an estuarine tidal regime. The dataset comprises bathymetric surveys, current profile and bottom pressure measurements at two locations, and time series of discharge. Our data indicate that the transition zone is characterized by strong tidal dissipation and distinctive channel geometry. Tidal dissipation is evident in the rapid decrease of the M2 amplitude to the mean along-channel velocity ratio from 2.1 to 0.9 over a ∼6-km distance. Channel cross-sectional area in the transition zone converges at a higher rate than both upstream and downstream while channel depth reveals threefold variations in the form of adjacent shoals and deeps. We hypothesize that the enhanced tidal dissipation is at the same time a cause and a result of strongly convergent bathymetry in the transition zone.

Keywords

River discharge Tidal dissipation Overtide Logarithmic layer Channel convergence 

Notes

Acknowledgments

The authors are thankful to anonymous reviewers for their stimulating comments and suggestions. This study was supported by NSF grant EAR-1053299. AY was partially supported by the University of South Carolina start-up funds.

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Copyright information

© Coastal and Estuarine Research Federation 2012

Authors and Affiliations

  • Alexander E. Yankovsky
    • 1
    Email author
  • Raymond Torres
    • 1
  • Legna M. Torres-Garcia
    • 1
  • Kyungho Jeon
    • 1
  1. 1.Department of Earth and Ocean SciencesUniversity of South CarolinaColumbiaUSA

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