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Mapping the Future
GIS Tools for Sea Level Rise
Mark Lightner, GISP
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Adapting to Rising TidesBay Area Sea Level Rise Analysis and
Mapping Project
2 Mapping the Future
CONSULTANT TEAM: Justin Vandever, Mark Lightner, Sarah Kassem,Julie Guyenet, Michael Mak, Claire Bonham-Carter
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General Methodology
– Create or obtain digital elevation model (DEM)
– Create landward water surface
– Initial sea level rise (SLR) calculations
– Stakeholder Review
– DEM Modifications
– Secondary SLR Calculations
– Overtopping Analysis
– Create Maps / Finalize Data
3 Mapping the Future
Inundation Mapping
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4 Mapping the Future
NOAA SLR Viewer
https://coast.noaa.gov/slr/
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5 Mapping the Future
Linear Superposition SLR Modeling
– AKA “Modified” bathtub– Detects lowlying areas– Accounts for hydro-connectivity
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6 Mapping the Future
Linear Superposition SLR Modeling
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7 Mapping the Future
Linear Superposition SLR Modeling
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8 Mapping the Future
NOAA Open Coast – Elevation Data
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9 Mapping the Future
NOAA Open Coast – Elevation Data
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10 Mapping the Future
LiDAR Point Cloud
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11 Mapping the Future
LiDAR Point Cloud – Ground
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12 Mapping the Future
LiDAR Point Cloud – Ground
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13 Mapping the Future
Water Surface Creation
Tool
INPUTSDEMWater Surface points (Tide Station, Vdatum, etc.)
PROCESSCreate contour on DEM (eg. 20ft)Create transects to contourInterpolate values at transects
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14 Mapping the Future
Water Surface Creation
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15 Mapping the Future
Water Surface Creation
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16 Mapping the Future
Water Surface Creation
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17 Mapping the Future
Water Surface Creation
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18 Mapping the Future
Water Surface Creation
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19 Mapping the Future
Inundation Tool
INPUTSDEMWater SurfaceScenario List
PROCESSIterates through scenarios• Add SLR to water surface• Subtract DEM from water surface• Evaluate connected areas (no pooling)• Create lowlying areas > 1 acre• Clip landward inundation to mask
OUTPUTSConnected inundation layersDisconnected lowlying areas > 1acres
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20 Mapping the Future
Inundation Tool
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21 Mapping the Future
Inundation Tool
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22 Mapping the Future
Inundation Tool
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23 Mapping the Future
OvertoppingTool
INPUTSDEMInundation layersShoreline
PROCESSCreate points along line (5ft)Assign DEM values to pointsIterate through scenarios• Assign water surface values to points• Calculate overtopping at point• Summarize (mean) of points in 100ft segment
OUTPUTSOvertopping line in 100ft segments
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24 Mapping the Future
OvertoppingTool
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25 Mapping the Future
Stakeholder Engagement– Community meetings
– Online draft maps
– Comments on location
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26 Mapping the Future
Stakeholder Engagement
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27 Mapping the Future
Stakeholder Engagement
Before modification After modification
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28 Mapping the Future
Final thoughts
• Uses readily available (and mostly free) data.• Automate (script) the bulk of the process.• CAN incorporate storm surge, tides, wave run-up
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