In suitable areas, living shorelines present a resilient approach to shoreline stabilization that can protect people, property, and important coastal habitats. The New Hampshire Coastal Program NHCP is working with partner organizations to advance understanding, application and success of living shoreline stabilization approaches in coastal New Hampshire. The New Hampshire Living Shoreline Site Suitability Assessment L3SA is intended to help interested stakeholders identify sites that are suitable for specific living shoreline approaches in order to address erosion issues along the New Hampshire tidal shoreline.
The L3SA evaluates living shoreline suitability using spatial data about the state's tidal shoreline and characteristics unique to the Northeast such as a short growing season, effects of ice, nor'easters, and large tidal range. The L3SA assigns a suitability index number between 1 less suitable and 6 highly suitable to points along the shoreline. The technical report includes details about the dataset development and the attribute descriptions.
The L3SA is intended to be a screening tool used for planning purposes only and sites of interest should be further evaluated with a site-specific survey.
You can order a free Property Profile summarizing living shoreline site suitability results for a specific property along the tidal shoreline from the Coastal Program. The Great Bay Living Shoreline Project aims to create new living shoreline projects in the Great Bay Estuary that protect salt marsh habitat and coastal communities from erosion, sea level rise and flooding. A planting guide has been created to help tidal shoreline landowners develop a planting plan.
It includes details about native or naturalized plant species that can help manage erosion near a tidal shoreline. In Phase II of regional living shoreline efforts, the Northeast state coastal zone management programs are working with NROC and TNC-MA to build living shoreline projects and implement consistent regional monitoring approaches that enable comparison of project effectiveness across states.
Read more about Phase II. Pilot projects in coastal New Hampshire are in various phases of construction and monitoring. Sites include fringe salt marsh restoration at North Mill Pond in Portsmouth, a rip rap replacement with fringe marsh creation at Cutts Cove in Portsmouth, an erosion management fringe marsh creation at Wagon Hill Farm in Durham, and dune enhancement in Hampton and Seabrook. Monitoring is ongoing at the sites. A fringe salt marsh living shoreline erosion management project was constructed at Wagon Hill Farm in Durham, New Hampshire in Efforts to monitor project success continue for five years.
Read more about the project here. A fringe salt marsh living shoreline restoration project was constructed at Cutts Cove in Portsmouth, New Hampshire.
For these reasons, hard structural solutions are not permitted in many environmentally-sensitive coastal areas. In the Mid-Atlantic and Gulf of Mexico states, there have been a number of applications of nature-based restorative approaches that include some combination of biotic natural media like oyster shell, natural fiber, marsh and native vegetation plantings, and the use of large sand envelopes or stone, sometimes seeded with live shellfish.
These installations are designed to protect property and prevent erosion while improving habitat, water quality, and ecological condition in a way that appears natural and is consistent with the character of coastal communities and uses of the shore. Living shorelines are a coastal subset of a larger group of green infrastructure practices, which include a greater range of nature-based techniques for inland areas that address storm water control, nutrient retention, and habitat enhancement in place of hard infrastructure.
This report provides a range of practical considerations for property managers, regulators, coastal municipal leaders, scientists and practitioners, who are interested in advancing living shoreline policies and practices.
The living shoreline profiles provide an overview of the techniques, conceptual designs, case studies, siting characteristics and design considerations and regulatory and review agencies that oversee the designs. Additionally, an applicability index has been developed for common living shoreline types in New England. It incorporates natural vegetation or other living, natural soft elements alone or in combination with some type of harder shoreline structure, like oyster reefs, rock sills, or anchored large wood for added stability.
Living shorelines connect the land and water to stabilize the shoreline, reduce erosion, and provide ecosystem services, like valuable habitat, that enhances coastal resilience.
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