Hydrodynamic modeling and understanding of marsh sediment, vegetation, and site hydrology were crucial to this restoration
Alley Pond Park is designated as a significant coastal fish and wildlife habitat by the New York State Department of Environmental Conservation and is home to unique and valuable aquatic ecosystems. Since 1974, more than 12 acres of shoreline salt marsh have been lost at a rate of two feet per year due to sea level rise and erosion.
To mitigate the effects of erosion in this coastal area, our team was engaged to design a living shoreline structure. With phase one consisting of the design, in phase two we expanded the structure by restoring and fortifying the eroded marshland. Using a hydrodynamic and wave modeling analysis, we evaluated the wave-induced energy expected to impact the shoreline both with and without the structure present. Based on results from the model and bio-benchmarking data collected by NYC Parks, approximately 10,900 square feet of sand placement and 7,345 square feet of salt marsh restoration bolstered with coconut coir logs were designed for erosion prevention along the shoreline.
The proposed restoration area will be protected by a series of oyster castles placed immediately offshore of the placement and planting area. This approach maximized low marsh creation within the constraints imposed by the site’s existing topography, and results in the longevity of the existing valuable ecosystems.
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