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Coastal Solutions

When trying to protect coastal areas, there are multiple options coastal managers can choose from. The purpose of this page is to introduce various solutions used along the coast and what problems they address. 

Gray vs Nature Based Coastal Solutions

Gray Coastal Infrastructure

Gray Coastal Infrastructure

Gray Coastal Infrastructure

Gray coastal infrastructure  is when hard engineered structures are used for beach protection. Common forms of gray coastal infrastructure include sea walls, groins, bulkheads, jetties, and detached breakwaters. 

Nature Based Solutions

Gray Coastal Infrastructure

Gray Coastal Infrastructure

`Nature based coastal solutions is when nature-based solutions are used to protect beaches. Common forms of nature based solutions include beach replenishment, living shorelines, oyster reefs, dune construction. The image above shows mangrove roots which can provide protection to coastal areas by attenuating wave energy. 

Types of Gray Infrastructure

Seawalls

Breakwaters

Breakwaters

Seawalls are large coastal structures meant to protect against storm surge and waves. The large structures provide strong protection against storms and tsunamis.

Seawalls in action

Breakwaters

Breakwaters

Breakwaters

Breakwaters prevent coastal erosion by reducing wave energy. Breakwaters can be built attached to the beach or offshore.

Breakwaters

Revetments

Breakwaters

Revetments

Revetments are built directly along the coastline and can be used for erosion control. Revetments come in different forms with some being permeable and others being impermeable. Revetments are useful when defending against wave activity. 

Revetments

Bulkheads

Jetties and Groins

Revetments

Bulkheads are a common erosion control found along the New Jersey coast. These walls protect coastal areas from wave activity and currents. 

Bulkheads

Jetties and Groins

Jetties and Groins

Jetties and Groins

Jetties and groins are used to prevent longshore sediment transport. Preventing transport up and down the coastline allows sediment to accumulate in areas of high erosion. These structures also serve an important role in inlet design.

Jetties

Benefits of Gray Coastal Infrastructure

Gray coastal structures are beneficial when dealing with high action wave climates. The structures are capable of handling intense conditions. Nature based solutions are not always suitable for extreme conditions such as tsunamis. In contrast, engineered structures such as seawalls or revetments offer more protection when wave energy is very high.

33% of shorelines will be hardened by 2100


NOAA, 2024

Downside of Gray Coastal Infrastructure

While gray coastal infrastructure can protect against severe conditions, it does have its downsides. Gray infrastructure can cause increased erosion at a location. Gray infrastructure can also lead to loss of habitat in coastal areas. For an example of how gray coastal infrastructure may be detrimental, click the button below.

Damage from seawalls

Types of Nature Based Solutions

Beach Replenishment

Beach Replenishment

Beach Replenishment

Beach replenishment is the placement of sand onto a beach to expand the beach profile. Beach replenishment had been used extensively along the New Jersey coast. For more information, click the button below.

Beach Replenishment

Oyster Reefs

Beach Replenishment

Beach Replenishment

Oyster reefs are similar to breakwaters in their function. However, in addition to attenuating wave energy, oyster reefs can also filter and clean water while providing habitat to multiple species. For more information, click the button below. 

Oyster Reefs

Dune Construction

Beach Replenishment

Wetland Restoration

Dunes stabilize beaches and provide protection to areas landward. Dunes can form naturally on beaches or be engineered. Regardless of origin, dunes are a vital form of coastal protection. For more information, click the button below. 

Dunes vs. Winter Storms

Wetland Restoration

Wetland Restoration

Wetland Restoration

Wetland restoration is a broad term that involves returning wetlands to their original state. Types of restoration vary by type of wetland and needs of the project. For more information on wetland restoration, click the button below.

wetland restoration

Living Shorelines

Wetland Restoration

Living Shorelines

Living shorelines is a broad term that includes stabilizing a coastal edge with all natural materials. Some of the nature based solutions mentioned previously are considered living shorelines. For more information on living shorelines, click the button below.

Living Shorelines

Benefits of Nature Based Solutions

Nature based solutions offer protection to coastal areas without the negative effects that seawalls or bulkheads may have. Nature based solutions also offer ecosystem services to an area by creating habitat along the coastline. 

Benefits of living shorelines

Shorelines having intact natural coastal habitats experience less damage from severe storms and are more resilient than hardened shorelines


NOAA Habitat Blueprint, 2024

Living Shorelines

Living shorelines have become a popular option for coastal restoration and have been documented as performing better than gray coastal structures. Living shorelines provide habitat, recreational value, and improve water quality. To see a living shoreline project in action click the button below.

Living Shorelines in Action

More on living shorelines

Living shorelines include a lot of different coastal solutions. The benefit of living shorelines is that they provide coastal protection without compromising ecosystem health. Living shorelines provide habitat, clean water, and provide recreational value to areas. Living shorelines can also grow over time increasing the amount of protection they provide. A common example of this, is the growth of an oyster reef. As the reef gets larger, it will disrupt larger waves and provide better protection to the shoreline. Living shorelines also provide a blue carbon sink. Salt marsh meadows can store twice as much carbon as tropical forests.

Living shoreline guideance

Click below for NOAA guidelines on the implementation and use of living shorelines.

NOAA Guidelines

NOAA Study on Living Shorelines

For more information on the ecosystem and environmental benefits of living shorelines, click the button below.

NOAA Study

Living Shoreline Case Studies

Littoral Society

Hybrid Solutions

What is a hybrid solution?

Hybrid solutions are when coastal managers combine gray coastal infrastructure like a breakwater with a nature based solution such as beach replenishment. The two solutions compliment each other and improve the project in a way neither solution could do on their own. For more information on a hybrid approach click the button below to view a case study done at Money Island along the Delaware Bay. 

Money Island

Additional Resources

Living Shorelines academyNew Jersey Living Shoreline Case StudiesBeach Erosion Activity for Students Community Resource Guide for Living Shorelines

References

  

  • Climate Adapt. 2023(a). Seawalls and jetties. Climate Adapt. [Accessed 20 April 2024]. Seawalls and jetties — Discover the key services, thematic features and tools of Climate-ADAPT (europa.eu)
  • Climate Adapt. 2023(b). Groynes, breakwaters and artificial reefs. Climate Adapt. [Accessed 20 April 2024]. Groynes, breakwaters and artificial reefs — Discover the key services, thematic features and tools of Climate-ADAPT (europa.eu)
  • Flood Hub. 2021. Coastal flood defenses: revetments. New Ground. [Accessed 20 April 2024]. Revetments.pdf (thefloodhub.co.uk)
  • National Oceanic and Atmospheric Administration. 2015. NOAA study finds ‘living shorelines’ can lessen climate change’s effects. NOAA. [Accessed 20 April 2024]. NOAA study finds ‘living shorelines’ can lessen climate change’s effects | National Oceanic and Atmospheric Administration
  • National Oceanic and Atmospheric Administration. 2024. Living shorelines. NOAA. [Accessed 20 April 2024]. Living Shorelines - NOAA Habitat Blueprint


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