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What you will hear
Project Background Hardened Shorelines vs. Living Shorelines Functions and Values of Salt Marshes Data collection and Site Constraints Salt Marsh Elements Lessons Learned
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Hunts Point Landing, Bronx, NY
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South Bronx Greenway
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South Bronx Greenway
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EXISTING
PROPOSED
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EXISTING
PROPOSED
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Existing Conditions Hunts Point Landing
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Existing Conditions Hunts Point Landing
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Coastal Wetlands Living Shorelines
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Annual gross and net primary productivity High productivity-subsides in the form of tides, nutrient
imports and abundance of water. Water Quality Improvement
Nutrient removal Fish and Shellfish Habitat
Spawning areas
Wildlife Habitat Food, Shelter, NestingSediment and Shoreline Stabilization
Stabilization of shorelines against erosion.
Functions and Values of Wetlands-Salt Marsh
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Shoreline ProtectionSediment Stabilization
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Sediment Stabilization
Sediment Stabilization
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RecreationFishingHuntingObserving wildlife
Education and Research Educational opportunitiesScientific studies
Open Space and Aesthetics
Visual enjoyment; great diversity and beautyHurricane Protection
Values of Wetlands
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Flood Reduction Hurricane Protection
Reduction in the depth of flooding as hurricanes Hilda and
Betsy swept inland across coastal marshes in Louisiana.
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Native Marsh vs. Hardened Shorelines
Diversity and Abundance of Benthic In Fauna Adjacent to Shoreline Types
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I. Water Quality Data
Bronx River CSO Study Intensive Surveys NYCDEP Harbor Survey Data
Bronx River CSO Study Velocity Survey
II. Velocity Data
Data Collection Site Constraints
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Observed VelocityMeasurements in
Bronx River
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HUNTS POINT SALINITY ANALYSIS
Resulting salinity in lower basin (ppt)
Winter Summer
Spring Tide 15.5 18.7
Mean Tide 15.0 18.0
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Scientific name Common name Location OptimumSalin
ity
SalinityTolerance
Pannicum virgatum Switchgrass Above MHW Low salttolerance Lowsalinities
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Wave Analysis Hunts Point Landing
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Fetch Analysis
Open water fetches greaterthan 1.6 km (1.0 miles) needprotection along withMaximum Wind SpeedEvaluation .
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Design Guidance Wave ProtectionDesign Guidance:
Protect against open water fetches by design or other protections
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Hudson Raritan Estuary
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Hudson Raritan Estuary
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Salt Marsh Development over accumulated sediment on a sand
flat and over upland under the influence of rising sea level.
In high energy environments; Shoreline design needs to providesome wave energy protection along with the ability to
accommodate sea level rise.
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Turtle Cove
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Pelham Bay
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Rocks in the High Marsh
Pelham Bay Salt Marsh
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Accommodation of Sea Level Rise
Pelham Bay Salt Marsh
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Rocks in the High Marsh
Pelham Bay Salt Marsh
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Alley Park Restoration
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Rocks on the High Marsh Placeholder slide
Alley Park Fresh and Salt Marsh
Design standard
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0
100
High Marsh Low Marsh Bay
MHW
TSS , Metals
Spartina patens(salt marsh hay)
MLWMidtide
Tide range= 7.2 ft
Substrate
Design standard
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d
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Design Guidance Wave Protection
HP Landing Shoreline Section Showing Hollow Block Option
Hunts Point Site C First Operable Unit
D i
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Design
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Recreational value
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Educational values
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Educational values
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Recreational Values
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Visual Values
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Design for Extreme Events
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Effects of Hurricane Sandy
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Effects of Hurricane Sandy
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Effects of Hurricane Sandy
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Effects of Hurricane Sandy
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Effects of Hurricane Sandy
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Lessons Learned
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Field/Data Required Existing Conditions Establish Goals Design to Realistic Functions and Values
Connect to Other Areas Maximize Soft Shorelines and Area Plan for extreme events. Urban areas will require maintenance.
Questions?
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