Hunts Point Landing, Bronx, New York

Size: px

Start display at page:

Download "Hunts Point Landing, Bronx, New York"

Audrey Brook Woods
5 years ago
Views:

Hunts Point Landing, Bronx, New York Sustainable Shorelines in an Urban Environment John Roebig, PhD. HDR Engineering, Inc. John.Roebig@hdrinc.

1 Hunts Point Landing, Bronx, New York Sustainable Shorelines in an Urban Environment John Roebig, PhD. HDR Engineering, Inc. Promoting Resilient Shorelines along the Hudson River Estuary: Sustainable Shorelines Project - November 7, 2012

2 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

3 Hunts Point Landing, Bronx, NY

4 Project Background Hunts Point as it appeared in 1952

5 South Bronx Greenway

10 South Bronx Greenway

11 EXISTING PROPOSED

12 EXISTING PROPOSED

13 Existing Conditions Hunts Point Landing

14 Existing Conditions Hunts Point Landing

15 Coastal Wetlands Living Shorelines Tidal Salt Marsh dominated by grasses-spartina

16 Functions and Values of Wetlands-Salt Marsh 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, Nesting Sediment and Shoreline Stabilization Stabilization of shorelines against erosion.

17 Shoreline Protection Sediment Stabilization Tidal Salt Marsh

18 Sediment Stabilization Sediment Stabilization

19 Values of Wetlands Recreation Fishing Hunting Observing wildlife Education and Research Educational opportunities Scientific studies Open Space and Aesthetics Visual enjoyment; great diversity and beauty Hurricane Protection

20 Flood Reduction Hurricane Protection Reduction in the depth of flooding as hurricanes Hilda and Betsy swept inland across coastal marshes in Louisiana.

21 Native Marsh vs. Hardened Shorelines Diversity and Abundance of Benthic In Fauna Adjacent to Shoreline Types

23 Data Collection Site Constraints I. Water Quality Data Bronx River CSO Study Intensive Surveys NYCDEP Harbor Survey Data II. Velocity Data Bronx River CSO Study Velocity Survey

25 Observed Velocity Measurements in Bronx River

26 HUNTS POINT SALINITY ANALYSIS Resulting salinity in lower basin (ppt) Winter Summer Spring Tide Mean Tide

27 Plant Tolerances to Salinity Levels Scientific name Common name Location Optimum Salin ity Pannicum virgatum Switchgrass Above MHW Low salt tolerance Phragmites australis Common reed Above MHW High salt tolerance Scirpus pungens Common three square Intertidal (upper 50% or mid-tide to MHW) Low salt tolerance Low salinities Salinity Tolerance <10 ppt up to 20 ppt Low salinities <10 ppt. Scirpus rubustus Saltwater bullrush Intertidal (upper 50% or mid-tide to MHW) Spartina alterniflora Smooth cordgrass Intertidal (upper 50% or mid-tide to MHW) High salt tolerance High salt tolerance up to 25 ppt ppt up to 60 ppt Spartina cynosuroides Spartina patens Big cordgrass Above MHW Low salt tolerance Saltmeadow cordgrass Above MHW High salt tolerance <10 ppt. up to 26 ppt Typha angustifolia Narrow leaved cattail. Intertidal (upper 20%) Low salt tolerance <10 ppt.

28 Wave Analysis Hunts Point Landing

29 Fetch Analysis Open water fetches greater than 1.6 km (1.0 miles) need protection along with Maximum Wind Speed Evaluation.

30 Design Guidance Wave Protection Design Guidance: Protect against open water fetches by design or other protections

31 Hudson Raritan Estuary

32 Hudson Raritan Estuary

33 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 provide some wave energy protection along with the ability to accommodate sea level rise.

34 Turtle Cove

35 Pelham Bay

36 Rocks in the High Marsh Pelham Bay Salt Marsh

37 Accommodation of Sea Level Rise Pelham Bay Salt Marsh

38 Rocks in the High Marsh Pelham Bay Salt Marsh

39 Alley Park Restoration

40 Rocks on the High Marsh Placeholder slide Alley Park Fresh and Salt Marsh

41 Design standard 0 High Marsh Low Marsh Bay Spartina patens (salt marsh hay) Tide range= 7.2 ft MHW Substrate TSS, Metals Midtide MLW 100

43 Design Guidance Wave Protection HP Landing Shoreline Section Showing Hollow Block Option Hunts Point Site C First Operable Unit

44 Design

85 Recreational values

86 Recreational value

89 Educational values

90 Educational values

91 Recreational Values

92 Visual Values

93 Design for Extreme Events

94 Effects of Hurricane Sandy

95 Effects of Hurricane Sandy

96 Effects of Hurricane Sandy

97 Effects of Hurricane Sandy

98 Effects of Hurricane Sandy

99 Effects of Hurricane Sandy

100 Lessons Learned 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.

101 Questions?

North Carolina Coastal Federation

North Carolina Coastal Federation Erosion Control: Non-Structural Alternatives A Shorefront Property Owner s Guide Shoreline erosion and landward migration of marshes are natural processes, and are important