r.h. weisberg and l. zheng fwri marine quest 04/09/05
DESCRIPTION
A Numerical Simulation of the Hurricane Charley Storm Surge in the Light of Lessons Learned from Tampa Bay. R.H. Weisberg and L. Zheng FWRI Marine Quest 04/09/05. Submergence based on a 5-foot uniform sea level rise. Submergence based on a 10-foot uniform sea level rise. - PowerPoint PPT PresentationTRANSCRIPT
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A Numerical Simulation of the Hurricane Charley Storm Surge in the Light of Lessons
Learned from Tampa Bay
R.H. Weisberg and L. Zheng
FWRI Marine Quest
04/09/05
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Submergence based on a 5-foot uniform sea level rise
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Submergence based on a 10-foot uniform sea level rise
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Submergence based on a 20-foot uniform sea level rise
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Hurricane Storm Surge Simulation Requirements
1) A high resolution numerical circulation model with capabilities for flooding and drying land.
2) Accurate wind and pressure fields.
3) High resolution bathymetry and elevation data.
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Hydrodynamic Model: FVCOM
3) Incorporating flooding/drying skill which is critical for storm surges study.
Advantages:
1) Using unstructured triangle grid to better represent complex coastal and estuarine geometry.
2) Using simple finite-difference which has simple discrete structures and computational efficiency.
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Prototypical Hurricane Structure (Holland, 1980)
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Merged bathymetry and topography
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Lessons learned from Tampa Bay
Based on prototypical category 2 and 4 storms that approach the region from several different directions, at different approach speeds, and making landfall at different locations.
http://ocg6.marine.usf.edu
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Model Grid for Tampa Bay Storm Surge Experiment
Minimum resolution: 100 m
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Category 2 storm translating at 5 m/s
Courtney Compbell Causeway
W. Howard Frankland Bridge
Gandy Bridge
Sunshine Skyway B
ridge
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24 Hour
OCG @ USF
St. Pete
Tampa
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28 Hour
OCG @ USF
Tampa
St. Pete
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30 Hour
OCG @ USF
St. Pete
Tampa
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Case I: IRB landfall from the west.
Case II: Translation up the Bay.
Case III: Coast parallel from the south Case IV: Coast parallel from the north
Arrow: landfall time
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Courtney Compbell Causeway
W. Howard Frankland Bridge
Gandy Bridge
Sunshine Skyway B
ridge
Category 2 storm translating at 5 m/s
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Case I: IRB landfall from the west.
Case II: Egmont Key.
Case III: Sarasota Case IV: Tarpon Springs
Arrow: landfall time
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1. 5 m/s (10 knot)
2. 10 m/s ( 20 knot)
3. 2.5 m/s ( 5 knot)
Category 2 storm making landfall at Indian Rocks Beach from the west with speeds of
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IRB landfall from the west withtranslation speeds of:
5 m/s,
10 m/s, and
2.5 m/s.
Arrow: landfall time
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1. Category 2
2. Category 4
Storm making landfall at Indian Rocks Beach from the west with speeds of 5 m/s
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30 Hour
OCG @ USF
Tampa
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IRB landfall from the west at5 m/s for: category 2
category 4. Arrow: landfall time
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The Surge in Tampa Bay Is Sensitive to:
1) the storm intensity;
2) the landfall location;
4) the direction of approach.
3) the speed of approach; and
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Hurricane Charley Storm Surge Simulation
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Big Carlos Pass
Ft. Myers
Sanibel Is.
Captiva
N. Pine Is.
Punta Gorda
E. side of CHW. side of CH
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Courtesy of T. Liebermann
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Summary1) Based on the lessons learned from Tampa Bay experiments we explain the relatively small H. Charley surge by virtue of:
• The approach direction from SW to NE and subsequent translation up the estuary.
• The rapid approach speed (16 knots).
• The small storm radius (10~20 km).
2) We account for the breach at North Captiva Island by the large across-barrier-island sea level gradient that occurred as the H. Charley passed by.
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Acknowledgments
This work was supported by the Office of Naval Research, grants # N00014-98-1-0158 and N00014-02-1-0972 and by the U.S. Geological Survey, order # 4-SPSA-11920. Changsheng Chen (UMassD) kindly shared the FVCOM code, and Timothy Liebermann (SFWMD) kindly shared the CH merged bathymetric and topographic data set.