Future Impacts to Land Subject to Coastal Storm Flowage Julia Knisel Coastal Shoreline & Floodplain Manager.

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Presentation transcript:

Future Impacts to Land Subject to Coastal Storm Flowage Julia Knisel Coastal Shoreline & Floodplain Manager

IPCC, 2001

Historic Rate of Sea Level Rise (Boston Tide Gauge) Mean range (MHW-MLW) = 9.5 feet Record = (91+ years) Sea level rise = 0.9 feet/100 years

Historic Sea Level Trends from 1921 to (Boston) Linear mean sea level rates ( ) & 95% confidence intervals (mm/yr) calculated from 1921 to recent years ( ) at the NOAA Boston tide gauge station Values are trend of entire data period up to that year

Global Sea Level Rise Projections/Scenarios

Recent Expert Assessment of Sea Level Rise Projections Horton et al., 2013

Coastal Inundation Mapping Elements Water Level: – Local tide ranges – Sea level rise data & projections – Flood event data (surge & precipitation) High Resolution Elevation Data: – Topographic & bathymetric LIDAR – Digital elevation models referenced to tidal datums Natural & Human Responses: – Current ecosystems (beaches & wetlands) – Landform changes (erosion & accretion) – Physical barriers to migration (development, seawalls, culverts, etc.)

Buzzards Bay Potential Flood Zone Expansion with Sea Level Rise (static)

Buzzards Bay Potential Hurricane Impacts with Sea Level Rise (dynamic)

South Shore Coastal Inundation Depth Scenarios (dynamic)

South Shore Coastal Inundation Depth Classification

South Shore Potential Nor’easter Impacts with Sea Level Rise (5 ft, dynamic)

3D Coastal Inundation Depth (with 5 ft of Sea Level Rise & Nor’easter Storm Surge)

Critical Parameters for Modeling Marsh Migration If sediment accretes (traps on surface or accumulates) as fast as sea level rises, then marsh may avoid being converted or submerged Marshes on the Move, 2011

Wetland Types & Tidal Ranges Land Surface Water Unconsolidated Shore* Salt Marsh Brackish/ Transitional Freshwater Wetlands Mean Low Water Mean Tide Level Mean High Water Mean High Water Spring 66% wetland Majority Dry Lands Elevation *includes silt, sand, or gravel that is subject to inundation and redistribution due to the action of water; substrates lack vegetation

Marsh Conversion to Unconsolidated Shore (Gloucester) Current75-Year Time Horizon (2080) Net marsh impact = MHHW ft sea level rise – 1 ft accretion

Marsh Conversion to Unconsolidated Shore (Salisbury) Current75-Year Time Horizon (2080) Net marsh impact = MHHW ft sea level rise – 1 ft accretion

Marsh Migration Limited by Development & Infrastructure (Newbury) Current75-Year Time Horizon (2080) Net marsh impact = MHHW ft sea level rise – 1 ft accretion

Marsh Migration Limited by Development & Infrastructure (Salisbury) Current75-Year Time Horizon (2080) Net marsh impact = MHHW ft sea level rise – 1 ft accretion

Summary of Sea Level Rise Projections & Impacts Historic rate of sea level rise (~ 1 ft/century) has shaped our shoreline Current rate accelerating 1.5 – 3x current rate reasonable by 2100 with climate mitigation measures…but uncertain Data exists to evaluate potential impacts & communities are actively engaged in projects Communities are vulnerable without shoreline migration/erosion Loss of wetlands increases reach of storm surge & flooding Preparation is extremely important