Post on 21-Jan-2016
transcript
Maintaining Coastal Infrastructure in Maintaining Coastal Infrastructure in Massachusetts: Approaches for Massachusetts: Approaches for
Shoreline ManagementShoreline Management
John S. Ramsey, P.E.John S. Ramsey, P.E.Applied Coastal Research and Engineering, Inc.Applied Coastal Research and Engineering, Inc.
How do manage our coastline?How do manage our coastline?
The influence of 380+ years of coastal development The influence of 380+ years of coastal development
What Makes the Massachusetts Shoreline Unique?What Makes the Massachusetts Shoreline Unique?
What Makes the Massachusetts Shoreline Unique?What Makes the Massachusetts Shoreline Unique?
Highest land Highest land feature at feature at
Winthrop Beach Winthrop Beach is the seawallis the seawall
What Makes the Massachusetts Shoreline Unique?What Makes the Massachusetts Shoreline Unique?
What Makes the Massachusetts Shoreline Unique?What Makes the Massachusetts Shoreline Unique?Historic Shoreline ArmoringHistoric Shoreline Armoring
What Makes the Massachusetts Shoreline Unique?What Makes the Massachusetts Shoreline Unique?Historic Shoreline ArmoringHistoric Shoreline Armoring
What Makes the Massachusetts Shoreline Unique?What Makes the Massachusetts Shoreline Unique?
What Makes the Massachusetts Shoreline Unique?What Makes the Massachusetts Shoreline Unique?Influence of StormsInfluence of Storms
How do these factors influence long-term stability?How do these factors influence long-term stability?
Long-term Lowering of Beach Long-term Lowering of Beach
How do these factors influence structure design?How do these factors influence structure design?
Undersized Armor Undersized Armor
The Result… The Result… Emergency Emergency
RepairsRepairs
But this solution is only a “band-aid”But this solution is only a “band-aid”
Putting It All Together… Think Regionally Putting It All Together… Think Regionally
Understanding local coastal processes is criticalUnderstanding local coastal processes is critical Establish alternatives analysis criteria Establish alternatives analysis criteria Expectations need to be reasonableExpectations need to be reasonable Economic evaluation should consider design lifeEconomic evaluation should consider design life Realistic evaluation of environmental impacts Realistic evaluation of environmental impacts
Project GoalsProject Goals
““Solution to the Problem”Solution to the Problem”
• Project design appropriate for siteProject design appropriate for site define project purpose and needdefine project purpose and need define design expectationsdefine design expectations anticipate environmental constraintsanticipate environmental constraints evaluate short- and long-term economicsevaluate short- and long-term economics
How do these factors influence design?How do these factors influence design?
Massachusetts Design Example - Point Allerton Massachusetts Design Example - Point Allerton
Point Point AllertonAllerton
Open Open AtlanticAtlantic
How do these factors influence design?How do these factors influence design?Massachusetts Design Example - Point Allerton Massachusetts Design Example - Point Allerton
How do these factors influence design?How do these factors influence design?
Massachusetts Design Example - Point Allerton Massachusetts Design Example - Point Allerton
How do these factors influence design?How do these factors influence design?
Increased Overtopping Rates Increased Overtopping Rates
How do these factors influence design?How do these factors influence design?
Massachusetts Design Example - Point Allerton Massachusetts Design Example - Point Allerton
WIS Station 52WIS Station 52
100-Year Significant Wave Heights at Seawall Toe
Existing Profile 9.1 ft
2.5 Feet of Scour 10.4 ft
5.0 Feet of Scour 11.8 ft
How do these factors influence design?How do these factors influence design?Massachusetts Design Example - Point Allerton Massachusetts Design Example - Point Allerton
Median Design Stone Weight
Existing Profile 12.5 tons
2.5 Feet of Scour 16.4 tons
5.0 Feet of Scour 20.9 tons
How do these factors influence design?How do these factors influence design?
Massachusetts Design Example - Point Allerton Massachusetts Design Example - Point Allerton
How do these factors influence design?How do these factors influence design?
Massachusetts Design Example - Point Allerton Massachusetts Design Example - Point Allerton
Re-Establishing Regional Sediment SupplyRe-Establishing Regional Sediment SupplyMassachusetts Example – Revere Beach Massachusetts Example – Revere Beach
Re-Establishing Regional Sediment SupplyRe-Establishing Regional Sediment SupplyMassachusetts Example – Winthrop Beach Massachusetts Example – Winthrop Beach
Pre-NourishmentPre-Nourishment
Post-NourishmentPost-Nourishment
How Are Shorelines Managed Elsewhere?How Are Shorelines Managed Elsewhere?
U.S. East U.S. East CoastCoast
New JerseyNew Jersey
Other IssuesOther IssuesDefinition LSCSF Based on FEMA Definition LSCSF Based on FEMA
Other IssuesOther IssuesDefinition LSCSF Based on FEMA Definition LSCSF Based on FEMA
Other IssuesOther IssuesChelsea Example – Preliminary FIS MapsChelsea Example – Preliminary FIS Maps
Other IssuesOther IssuesRegional Relative Sea-Level Rise Regional Relative Sea-Level Rise
Massachusetts Subsidence -0.84 mm/yearMassachusetts Subsidence -0.84 mm/year
Other IssuesOther IssuesOgunquit– Flooding ExampleOgunquit– Flooding Example
Questions?Questions?
Applied Coastal Research and Applied Coastal Research and Engineering, Inc.Engineering, Inc.