2. Coastal Processes Analysis for Vilano Beach, St. Johns County, FL Taylor Engineering, Inc. Hande Caliskan, M.Sc. Christopher Bender, Ph.D., P.E., D.CE Michael Krecic, P.E. U.S. Army Corps of Engineers, Jacksonville District, FL Jason Engle, P.E.

3. OVERVIEW Project Description oPurpose oProject Site Study Approach oGenCade SMS Interface oData Calibration/Verification oProcedure oResults Sensitivity Analysis Summary and Results

4. PROJECT DESCRIPTION

7. PURPOSE USACE Jacksonville District is conducting a Hurricane and Storm Damage Reduction Study The GENESIS Model will provide erosion rates for beach nourishment alternatives

8. PROJECT SITE

9. STUDY APPROACH

10. Regional Contour Initial Shoreline GENESIS Grid Wave Stations R-64 R-69 R-74 R-79 R-84 R-89 R-94 R-99 R-104 R-109 R-114 R-119

11. DATA Florida Coastal Forcing Project (FCFP) Wave Data for Saint Johns County, FL FCFP Data at every 5 th nearshore station FDEP Historical MHW and Beach Profile Data

12. CALIBRATION

13. R-84 Small MHW Shoreline Change Large Volume Change R-84

14. R-114 Small MHW Shoreline Change Large Volume Change

19. SENSITIVITY ANALYSES

20. ParameterRangeModel Value Time Step0.25 – 2.00 hr0.25 hr D 50 0.1 – 0.5 mm0.2 mm Berm Height7 – 9 ft9 ft Depth of Closure20 and 25 ft20 ft K10.5 – 0.750.75 K20.25 – 0.40.4 Model Parameters

22. SUMMARY AND RESULTS

23. The shoreline change modeling component of the St. Johns County, Florida Hurricane and Storm Damage Reduction Feasibility Study developed and calibrated a GENESIS model for the study area (R-84 in South Ponte Vedra Beach southward to R-121 in Vilano Beach north of St. Augustine Inlet). The study applied the GENESIS model within the GenCade regional sediment management tool developed by the USACE ERDC. The calibrated and verified GENESIS model results agree well with measured beach volume changes during the calibration period (July 1986 to January 1999). The model produces reasonable agreement with measured volume changes during the verification period (January 1999 to August 2007) Additional model simulations documented the calibrated and verified GENESIS model sensitivity to selected model parameters.

24. QUESTIONS???