Coastal Processes Analysis for Vilano Beach, St. Johns County, FL Taylor Engineering, Inc.
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Coastal Processes Analysis for Vilano Beach, St. Johns County, FL
Taylor Engineering, Inc.Hande Caliskan, M.Sc.
Christopher Bender , Ph.D., P.E., D.CEMichael Krecic, P.E.
U.S. Army Corps of Engineers, Jacksonville District, FLJason Engle, P.E.
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OVERVIEW• Project Description
o Purposeo Project Site
• Study Approacho GenCade SMS Interfaceo Data
• Calibration/Verificationo Procedureo Results
• Sensitivity Analysis• Summary and Results
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PROJECT DESCRIPTION
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PURPOSE
• USACE Jacksonville District is conducting a Hurricane and Storm Damage Reduction Study
• The GENESIS Model will provide erosion rates for beach nourishment alternatives
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PROJECT SITE
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STUDY APPROACH
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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
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DATA
• Florida Coastal Forcing Project (FCFP) Wave Data for Saint Johns County, FL
• FCFP Data at every 5th nearshore station
• FDEP Historical MHW and Beach Profile Data
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CALIBRATION
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R-84Small MHW
Shoreline Change
Large Volume Change
R-84
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R-114
Small MHW Shoreline Change
Large Volume Change
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-125
-100
-75
-50
-25
0
25
50
75
100
0 5000 10000 15000 20000 25000 30000 35000 40000 45000 50000 55000 60000 65000
Distance from R-63 (ft)
Sh
orel
ine
Pos
itio
n C
han
ge (
ft)
Measured Shoreline Change
Calibrated Model Shoreline Change
Shoreline Change Calculated fromMeasured Volume Change
Project Area
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SENSITIVITY ANALYSES
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Parameter Range Model Value
Time Step 0.25 – 2.00 hr 0.25 hr
D50 0.1 – 0.5 mm 0.2 mm
Berm Height 7 – 9 ft 9 ft
Depth of Closure 20 and 25 ft 20 ft
K1 0.5 – 0.75 0.75
K2 0.25 – 0.4 0.4
Model Parameters
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SUMMARY AND RESULTS
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• 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.
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QUESTIONS???