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TRANSCRIPT
Mapping the Future
GIS Tools for Sea Level Rise
Mark Lightner, GISP
Adapting to Rising TidesBay Area Sea Level Rise Analysis and
Mapping Project
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CONSULTANT TEAM: Justin Vandever, Mark Lightner, Sarah Kassem,Julie Guyenet, Michael Mak, Claire Bonham-Carter
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
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Inundation Mapping
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NOAA SLR Viewer
https://coast.noaa.gov/slr/
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Linear Superposition SLR Modeling
– AKA “Modified” bathtub– Detects lowlying areas– Accounts for hydro-connectivity
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Linear Superposition SLR Modeling
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Linear Superposition SLR Modeling
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NOAA Open Coast – Elevation Data
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NOAA Open Coast – Elevation Data
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LiDAR Point Cloud
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LiDAR Point Cloud – Ground
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LiDAR Point Cloud – Ground
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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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Water Surface Creation
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Water Surface Creation
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Water Surface Creation
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Water Surface Creation
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Water Surface Creation
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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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Inundation Tool
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Inundation Tool
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Inundation Tool
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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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OvertoppingTool
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Stakeholder Engagement– Community meetings
– Online draft maps
– Comments on location
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Stakeholder Engagement
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Stakeholder Engagement
Before modification After modification
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Final thoughts
• Uses readily available (and mostly free) data.• Automate (script) the bulk of the process.• CAN incorporate storm surge, tides, wave run-up
