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Coastal Hazards Analysis

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Title: Coastal Hazards Analysis


1
  • Coastal Hazards Analysis Management Program
  • (CHAMP)
  • A 2005-2007 NOAA Coastal Management Fellowship
  • CT Department of Environmental Protection
  • Office of Long Island Sound Programs (OLISP)
  • May 28th, 2008

2
CHAMP Rationale Objectives
  • Rationale
  • State/Municipal officials, academia, coastal
    property owners and the general public would
    benefit from a single, comprehensive, updatable
    source of hazards information for the coast.

3
CHAMP Project Deliverables
  • Coastal Hazards Research Assessment
  • Analyze existing coastal hazards information for
    CT and provide a status report.
  • Coastal Hazards Web Site Visualization Tools
  • Web site to deliver hazards related information
    and data
  • Develop an interactive inundation visualization
    tool
  • Outreach to Coastal Communities
  • Let them know data and tools exist to help
  • plan/prepare/recover from coastal hazards

4
CHAMP Inundation Visualization
  • Show inundation from sea level rise scenarios
  • Let users see the effects of various levels of
    SLR as GIS datalayers draped over imagery
  • give some on the ground meaning to many numbers
  • Beginning pilot work area
  • Show inundation from storm surge
  • Let users see the effects of varying intensity
    storms as GIS datalayers draped over imagery
  • Historic hypothetical storms
  • Leverage expertise from UCONN Marine Science
    Dept.
  • Come after SLR work is further along

5
CHAMP GIS Sea Level Rise Process
  • Obtain best-available elevation data to model the
    landscape
  • Coastal LiDAR collected by FEMA in 2006 for
    Flood Map Modernization
  • Bare Earth Digital Elevation Model (DEM)
    buildings vegetation removed
  • High vertical accuracy (RMSE-spec 0.61ft
    RMSE-data 0.22ft)
  • wide spatial coverage

Bluff Point Poquonock River, Groton, CT
6
CHAMP GIS Sea Level Rise Process
Coastal LiDAR data coverage area ( area of
100yr Flood Zone)
7
CHAMP GIS Sea Level Rise Process
  • Raise water levels to correspond to common values
    of SLR (ex IPCC high/low estimates, various
    scientific studies)
  • display rises relative to mean sea level -
    easy
  • display rises relative to local tide levels
    (eg. MHW) - harder
  • Leverage work done previously by UCONN CLEAR to
    do this
  • extract the areas that waterbodies from the
    DEM surface data
  • use GIS analysis tools that take the waterbody
    areas and the surrounding land area and flood
    them to a specific water level

8
CHAMP GIS Sea Level Rise Results
DEM surface data draped over 2005 CIR orthophoto
9
CHAMP GIS Sea Level Rise Results
Waterbody area (approximating mean sea level)
extracted from DEM data draped over 2005 CIR
orthophoto
10
CHAMP GIS Sea Level Rise Results
Areas in GREEN rise in sea level of 3 ft over
mean sea level. In other words, these areas will
flood if sea level rises 3 ft.
11
CHAMP GIS Sea Level Rise Results
Areas in YELLOW expected limit of MHW if sea
level rises 3ft. In other words, these areas
will likely experience flooding due to daily
tidal action if sea level rises 3 ft.
12
CHAMP GIS Wrap-up/Next Steps
  • QA/QC work critical
  • areas where flooding not possible were flooded
    due to artifacts in the processing
  • Begin work on Storm Surge
  • use UCONN circulation models to create data
    for storm surge
  • incorporate detailed community level GIS data
    (eg storm drin locations) to provide better
    results.)
  • use GIS data created from ACOE historic
    hurricane water level surveys to check results
  • compare results to recent SLOSH maps, other
    inundation data

13
CHAMP GIS Other Examples
  • UCONN CLEAR
  • looked at coastal storm surge using different
    elevation data and NWS SLOSH model output
  • http//clear.uconn.edu/projects/DEVELOP/index.h
    tm

14
CHAMP GIS Contacts
Kevin OBrien Environmental Analyst CT Dept. of
Environmental ProtectionOffice of Long Island
Sound Programs79 Elm St., Hartford, CT
06106Phone  860-424-3432kevin.obrien_at_ct.gov
Joel Johnson NOAA Coastal Management Fellow CT
Dept. of Environmental ProtectionOffice of Long
Island Sound Programs79 Elm St., Hartford, CT
06106Phone  860-424-3939joel.johnson_at_ct.gov
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