Zawada, D. G., U.S. Geological Survey, St. Petersburg, USA, dzawada@usgs.gov
Hearn, C. J., ETI Professionals, Inc. at USGS, St. Petersburg, USA, clifford_hearn@yahoo.com

ALONG-SHORE SAND FEATURES IN A LOW-ENERGY, SUBTROPICAL ESTUARY: OBSERVATIONS AND MODELING

Tampa Bay is the largest open-water estuary in Florida, encompassing nearly 1,036 km2. An interesting benthic feature is the presence of along-shore sand undulations in shallow waters (< 3 m) of the southeastern portions of the bay. These features are comprised of a series of broad, low-profile ridges parallel to shore. To determine the spatial and temporal variability of these bottom ridges, acoustic surveys were performed in March, June, and September 2007. The acoustic profiles were compared with aerial photographs dating back to the 1950s and bathymetry derived from lidar data collected in 2004. In addition, wave and current data were collected for use in hydrodynamic models specifically developed for Tampa Bay. The results revealed that the undulations have been persistent coastal features since at least the 1950s. The sediment-transport components of the models indicated spatially variable regions of accretion and deposition nearshore, due to the modulation of tidal currents by bathymetry.

Poster presentation

Presentation is given by student: No
Session #:141
Date: 03-03-2008
Time: 17:30 - 19:30

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