Shoreline Armoring

Massive sand bags View Shoreline Armoring Gallery

This refers to the construction of seawalls, jetties, offshore breakwaters and groins intended to hold shorelines in place. Although it is well understood by scientists that armoring beaches destroys beaches on a decadal time scale, this fact is still widely unrecognized by the general public or ignored by coastal developers and engineers. The demand for armoring will become even more widespread as the rate of sea-level rise and shoreline retreat increases. A few political entities (North Carolina, USA, North Sea Coast of Holland) have outlawed armoring (with moderate success) and more should be urged to do so. There are large numbers of salesmen with “unique” types of seawalls and groins (Holmberg Device) that need to be refuted.

Definitions of Shoreline Armoring Terms

Accretion
The addition of sand to a beach allowing it to widen and build out seaward.
Groin
Groin is a structure built perpendicular to the shoreline usually of rock or metal designed to trap sand that moves in the long shore current
Hardened beach structures
A general term referring to groins, jetties, offshore breakwaters, sea walls, tombolos, or any other engineered
Jetty
A jetty is a hardened structure built at an inlet usually made of rock or metal designed to keep navigation channels from filling in with sediment
Longshore drift
Long shore drift carries sand and sediment parallel to the shore and serves as the sand source for many beaches. On the east coast of the US, the long shore current is from the north to the south.
Offshore breakwaters
An engineered structure placed offshore and parallel to the beach. Breakwaters mimic sandbars to cause waves to break, lessening erosion on the beach behind the breakwater, but interrupting the longshore drift.
Shoreline armoring
The use of groins, jetties, offshore breakwaters, sea walls, tombolos or other hardened beach structures on the shore
Sea wall
A sea wall is designed to protect the land from erosion particularly during storms and usually made of metal, wood, or rock. One of the most famous seawalls is the Galveston seawall in Galveston, TX built after the 1900 hurricane killed 6,000 people on the island.
Tombolos
Tombolos are a special type of groin built perpendicular to the shore to trap sand, but with an end parallel to the shore designed to reduce wave energy.

Surfing in / Shoreline Armoring

Battling Ghana’s Eroding Coastline

For Ghana, the real story of coastal erosion is not about what lies at the water’s edge, but what occurs beneath the waves offshore. In the capital city of Accra, an estimated 70 percent of the beach is eroding at rates exceeding 3 feet per year.

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Sinking Sundarbans: A Photo Gallery by Peter Caton, Greenpeace

The seas around the islands in the Bay of Bengal that support a unique mangrove ecosystem, are rising faster than anywhere else on Earth, and the lives and livelihoods of more than 4 million residents are under threat from rising waters.

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Artificial Offshore Reef Could Stop Serious Beach Erosion

Such costly reef have proved successful in other areas, and it could be the only option to protect the coastline of Old Bar, Australia.

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Louisiana Curtails Coastal Plan

Officials are temporarily scaling back their ambitions for a massive sand berms program that was designed to block oil from hitting coastal marshes but that continues to draw federal opposition.

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The Trouble with Seawalls

Recent events in Tofino, Canada, remind us that a beach is dynamic in nature and ever evolving.

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Photos tell different stories about sand berm effort to block oil spill

Critics and supporters of building sand berms to shield Louisiana’s coast from the Gulf of Mexico oil spill have released dueling photo sequences.

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A Sand Trap in the Gulf; By Robert Young, in The New York Times

Of the many cleanup solutions being pursued in the Gulf of Mexico, few are as ambitious as Louisiana’s berm project.

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Use of Hardened Beach Structures to Slow Erosion

Use of Hardened Beach Structures

While the use of hardened beach structures are debated, there is little debate over what they do beaches over time.

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North Carolina’s Legislation on Hardened Structures Reconsidered

North Carolina Legislation

North Carolina law has prohibited hardened structures on its beaches and inlets for more than two decades.

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  • Recent / Shoreline Armoring

    Use of Hardened Beach Structures to Slow Erosion

    Use of Hardened Beach Structures

    March 21st, 2010

    While the use of hardened beach structures are debated, there is little debate over what they do beaches over time.

    Read More

    North Carolina’s Legislation on Hardened Structures Reconsidered

    North Carolina Legislation

    March 15th, 2010

    North Carolina law has prohibited hardened structures on its beaches and inlets for more than two decades.

    Read More

    Use of Sand Bags on Beaches

    Use of sand bags on beaches

    February 28th, 2010

    Sand bags are used to stabilize buildings that are threatened by the ocean.

    Read More

    The Negative Impacts Of Groins

    The negative impact of groins

    February 12th, 2009

    The negative impact of groins on downdrift shorelines is well understood.

    Read More