American Society of Civil Engineers


Modeling Dune Response Using Measured and Equilibrium Bathymetric Profiles


by Laura A. Fauver, (U. S. Geological Survey, Florida Integrated Science Center, 600 Fourth Street South, St. Petersburg, FL 33701 E-mail: lfauver@usgs.gov), David M. Thompson, (U. S. Geological Survey, Florida Integrated Science Center, 600 Fourth Street South, St. Petersburg, FL 33701), and Asbury H. Sallenger, (U. S. Geological Survey, Florida Integrated Science Center, 600 Fourth Street South, St. Petersburg, FL 33701)
Section: Storms I, pp. 897-910, (doi:  http://dx.doi.org/10.1061/40926(239)69)

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Document type: Conference Proceeding Paper
Part of: Coastal Sediments ’07
Abstract: Coastal engineers typically use numerical models such as SBEACH to predict coastal change due to extreme storms. SBEACH model inputs include pre-storm profiles, wave heights and periods, and water levels. This study focuses on the sensitivity of SBEACH to the details of pre-storm bathymetry. The SBEACH model is tested with two initial conditions for bathymetry, including (1) measured bathymetry from lidar, and (2) calculated equilibrium profiles. Results show that longshore variability in the predicted erosion signal is greater over measured bathymetric profiles, due to longshore variations in initial surf zone bathymetry. Additionally, patterns in predicted erosion can be partially explained by the configuration of the inner surf zone from the shoreline to the trough, with surf zone slope accounting for 67% of the variability in predicted erosion volumes.


ASCE Subject Headings:
Dunes
Equilibrium
Models