R. Hancock Sea Level Rise and the Conservation of Coastal Wetlands LOCAL SOLUTIONS: Northeast Climate Preparedness Conference May 20, 2014.

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Presentation transcript:

R. Hancock Sea Level Rise and the Conservation of Coastal Wetlands LOCAL SOLUTIONS: Northeast Climate Preparedness Conference May 20, 2014

RI has lost 53% of its salt marshes over the last 200 years due to man-made alterations (Bromberg and Bertness, 2005) Why does it matter? Hancock 2009

Why is Salt Marsh Important? Forage and nursery habitat Nesting and migratory sites Carbon sink $6,471/acre/yr for maintaining fisheries (US East Coast) $75 M in commercial fishery landings (RI) $150 M recreational fishery (RI)

Why is Salt Marsh Important? Reduces storm damage $2,931/acre/year (RI) Costanza et al., 2008 $5 billion of Rhode Island property protected by coastal habitats by 2100 Arkema et al., 2013

Why is Salt Marsh Important? Clean water: trap sediments, sequester nitrogen $780-$15,000/acre/yr for water purification

STB’s 10 years of restoration monitoring has shown that conditions can change rapidly in tidally restricted marshes Recently, similar degraded conditions have been observed in marshes with no tidal restrictions 2010 Source: Save The Bay

High Tides Affect our Communities Today Bold Point Park East Providence J. Boyd, 10/27/11 2’ MHHW South Shore Ave., Warwick W. Ferguson, 06/04/12 2.4’ MHHW North Avenue, Jamestown R. Calabro, 06/03/12 2’ MHHW American Tourister, Warren R. Calabro, 09/29/11 2.2’ MHHW

Impediments to Coastal Marsh Migration

Project Framework 1.Develop marsh migration modeling results 2.Identify existing vulnerable wetlands 3.Identify upland parcels where wetlands will likely migrate 4.Develop new state coastal program adaptive strategies, policies and standards 5.Increase local capacity to proactively incorporate adaptation policy for wetlands (comprehensive plans, zoning codes, etc.)

Opportunities for Upland Migration and Restoration With the proper conditions, salt marsh can migrate upland We can model likely future habitat

Model Inputs - Each area is unique

Modeling – Current Conditions

Model Results – 1’ SLR

Model Results – 3’ SLR

Model Results – 5’ SLR

Municipal Work Sessions: Identifying Issues & Opportunities

Barrington Much of this land is protected or under easement, so future migration will be possible Consider buyouts Property flooding and “road shortening”

Bristol Redirect traffic New causeway Enlarge culverts Impassable during Sandy Low-lying area; currently floods during storms

East Providence This will be a park Enlarge culvert Raise road to improve flushing Move mow line back at golf course Move parking lot back Floods now during spring tide

Local Considerations Planning Operations Infrastructure Conservation Union Studio Architects

Work Underway…

Questions?