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Alabama Coastal Mapping Update

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Title: Alabama Coastal Mapping Update


1
Alabama Coastal Mapping Update
Presented By Bradley Heilwagen, PE, CFM Jason
Wilson, PE, CFM AMEC Earth and Environmental
2
FEMA Priorities
  • Conclusion of Map Modernization in Fiscal Year
    2008
  • Priorities for 2009 and beyond
  • Levees
  • Unmapped areas
  • Under mapped areas
  • COASTALgtgtgtgtgtgtgtgtgtgtgtgtgtgtgtgtgtgtgtgt

3
Alabamas Coastal Mapping Update
  • In January 2009, Alabama Office of Water
    Resources and the Northwest Florida Water
    Management District submitted a proposal to FEMA
    titled Coastal Modeling and DFIRM Production
    Proposal for Coastal Northwest Florida and
    Alabama
  • Proposal accepted in February at just over 5
    million dollars for the entire project.
  • Grants issued in early summer 2009

4
Alabamas Coastal Mapping Update
  • Two phase approach
  • Phase 1 ADCIRC/Wave set up modeling to
    determine 10, 2, 1 and 0.2 annual chance
    stillwater elevations.
  • ADCIRC model being developed by NOAA which covers
    Baldwin and Mobile Counties in Alabama plus
    Escambia, Santa Rosa, Okaloosa, Walton, Bay and
    Gulf Counties in Florida. ADCIRC is an Advanced
    3D Circulation Model used to compute storm surge
    heights from either historic or synthetic storm
    events.
  • The storm surge study will be performed for the
    coastline of the eight counties with a single
    storm surge model effort (requires hundreds of
    storm runs and thousands of hours of processing
    time).
  • Phase 2 Overland wave or transect modeling and
    DFIRM mapping.

5
Alabamas Coastal Mapping UpdateProject Team
6
Alabamas Coastal Mapping UpdateProject
TeamPhase I team
  • Managed by Ron Bartel, Director of Division of
    Resource Management, NWFWMD
  • Study Team
  • Jeff Gangai, Project ManagerDewberry, Inc.
  • Dr. Don Slinn, University of Florida
  • Dr. Scott Hagen, University of Central Florida
  • Dr. Chris Reed, URS Corporation

7
Alabamas Coastal Mapping UpdateProject
TeamPhase II team
  • Managed by Leslie Durham, Chief of the
    Floodplain Management Branch, Alabama Office of
    Water Resources
  • Study Team
  • Jason Wilson, Project ManagerAMEC (Birmingham,
    AL)
  • Dr. Scott Douglass, University of South Alabama
    and South Coast Engineers

8
Where do we stand right now?
  • Contractor Team Kick-off meeting September 1,
    2009 in Fairhope, AL
  • Field reconnaissance under way
  • All contractors under contract
  • Pre-scoping

9
FEMA Guidelines
  • Standards relevant to coastal mapping can be
    found in the following documents
  • Guidelines and Specifications for Flood Hazard
    Mapping Partners, Appendix D Guidance for
    Coastal Flooding Analyses and Mapping, April
    2003.
  • Atlantic Ocean and Gulf of Mexico Coastal
    Guidelines Update, February 2007.

10
Coastal Hazard Analyses Present in the Effective
Baldwin/Mobile County FIRMs
  • BALDWIN--Coastal Hydrologic Analyses for June 17,
    2002 Countywide Study
  • Stillwater surface elevations were not revised
    (work completed in 1983). Based on the effective
    stillwater elevations, coastal hazard analyses
    included wave hindcasting, wave setup, beach
    erosion, wave runup, wave height, and flood
    hazard mapping along the Gulf of Mexico and
    interior bay shorelines in Baldwin County.
  • Currently 79 transect locations
  • No new hydrologic or hydraulic analyses were
    performed for the July 6, 1998 countywide study.
  • Effective analyses completed in 1983no updates
    since.
  • Currently 27 transect locations

11
Questions so far?
  • Coastal Research Reconnaissance

12
Coastal Research
  • General Geographic Setting
  • Extreme Tropical Flooding Events
  • Summary of Previous Studies

13
General Geographic Setting
14
Extreme Tropical Flooding Events
  • 1926 Great Miami Hurricane
  • 1950 Hurricane Baker
  • 1953 Hurricane Florence
  • 1969 Hurricane Camille
  • 1974 Hurricane Carmen
  • 1975 Hurricane Eloise
  • 1977 Hurricane Babe
  • 1979 Hurricane Frederic
  • 1985 Hurricane Danny
  • 1985 Hurricane Elena
  • 1988 Tropical Storm Beryl
  • 1988 Hurricane Florence
  • 1994 Tropical Storm Alberto
  • 1995 Hurricane Erin
  • 1995 Hurricane Opal
  • 1997 Hurricane Danny
  • 1998 Hurricane Georges
  • 2000 Tropical Depression Nine
  • 2002 Tropical Storm Hanna
  • 2002 Tropical Storm Isidore
  • 2003 Tropical Storm Bill
  • 2004 Hurricane Ivan
  • 2004 Tropical Storm Matthew
  • 2005 Tropical Storm Arlene
  • 2005 Hurricane Dennis
  • 2005 Hurricane Katrina
  • 2008 Tropical Storm Fay
  • 2008 Hurricane Gustav

15
Great Miami Hurricane - 1926
  • September 20, 1926
  • Brief landfall near Perdido Beach
  • Winds up to 116 mph recorded near Pensacola
  • 11 foot tidal surge
  • Most Costly Hurricane in U.S. History (when
    adjusted for inflation)

Graphic Courtesy of NOAA Coastal Coastal Services
Center
16
Hurricane Camille - 1969
  • Category 5 - August 18, 1969
  • Landfall at Bay St. Louis, MS
  • Storm surge of 6 9 feet recorded throughout
    Alabama Coast.

Graphic Courtesy of NOAA Coastal Coastal Services
Center
17
Hurricane Frederic - 1979
  • Category 3 - September 12, 1979
  • Landfall at Dauphin Island, AL
  • Storm Surge 14 feet at Dauphin Island
  • Storm Surge 10 feet at Fort Morgan
  • Calibration Storm for 1983 FIS Work

18
Hurricane Ivan - 2004
  • Category 5 September 16, 2004
  • Landfall at Gulf Shores, AL
  • 14 foot storm surge recorded between Gulf Shores
    and Orange Beach.
  • 100-yr flood elevations exceeded throughout
    Alabama.

Graphic Courtesy of NOAA Coastal Coastal Services
Center
19
Hurricane Ivan vs. Effective FIS
20
Hurricane Katrina - 2005
  • Category 3 August 29, 2005
  • Landfall near New Orleans, LA
  • 100-yr flood elevations exceeded throughout
    Alabama.
  • Dauphin Island overwashed.

Graphic Courtesy of NOAA Coastal Coastal Services
Center
21
Hurricane Katrina vs. Effective FIS
22
Previous Studies
  • Baldwin County Flood Insurance Study
  • Surge Elevations Revised 1983
  • Wave Elevations Revised June 2002
  • Mobile County Flood Insurance Study
  • Surge Wave Elevations Revised 1983
  • Jackson County, MS Flood Insurance Study
  • Scoping Meeting July 14, 2004 (Hurricane Katrina
    August 29, 2005)
  • Effective March 16, 2009
  • 4 6 foot difference in Coastal Flood Elevations!

23
Coastal Reconnaissance
  • Inspect characteristics of beach, dunes and
    Primary Frontal Dune (PDF) location
  • Document obstructions
  • Vegetation
  • Marsh
  • Buildings
  • Coastal structures
  • High Water Marks

24
Characteristics of Beach, Dunes, PFD
  • Most of Alabamas PFD lost during Hurricane
    Frederic 1979
  • USGS Coastal Classification (2006)
  • Absent
  • Overwash Terrace
  • Discontinuous
  • Continuous
  • Continuous/Discontinuous Dunes
  • Kiva Golf Course Beach Club
  • Bon Secour NWR
  • Orange Beach

25
Absent
26
Overwash Terrace
27
Discontinuous
Photo Courtesy of USFWS (2008)
28
Continuous
Photo Courtesy of USGS (2006)
29
Vegetation
  • Marsh Grasses
  • Diameter (lower 1/3, middle 1/3, upper 1/3)
  • Density (plants / square foot)
  • Rigid Vegetation
  • Spacing
  • Diameter
  • Height
  • Aerial vs. Ground

30
Aerial vs. Ground
31
Aerial vs. Ground
32
Aerial vs. Ground
33
Aerial vs. Ground
34
Buildings
  • Density (Ratio of building to open space)
  • Number of Rows
  • Elevated on slab or grade

35
High Density Single Row Not Elevated
36
Low Density No Rows - Elevated
37
High Water Marks
38
Hurricane Ivan Celebrated HWMGulf Shores, AL
  • September 16, 2004
  • 14 foot storm surge

39
Shrimp Basket
40
Original Oyster House
41
Boudreauxs Seafood Market
42
Questions/Comments
  • Jason.Wilson_at_amec.com
  • Brad.Heilwagen_at_amec.com
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