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Coastal Erosion Prevention

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by

Erica Hicks

on 3 December 2013

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Transcript of Coastal Erosion Prevention

Coastal Erosion Prevention
Hard Structural Stabilization
Man made structures used in order to prevent erosion. These structures reduce the energy produced by waves which causes erosion. It's main job is to add sediment back to the beach as it erodes away. Different types of hard stabilization are seawalls and breakwaters which are parallel to the shore and groins and jetties which are perpendicular.
Goal of Stabilization
The goal of stabilization is to slow the process and severity of beach erosion, so that future generations can enjoy the same beaches that we do!
Soft Structural Stabilization
Beach Nourishment: The addition of sand and sediment to a beach to replace the sand and sediment that has been eroded away.
Vegetation Control: The use of wetland or upland vegetation to control or prevent further erosion.
Nonstructural Stabilization
Nonstructural stabilization uses nature as a buffer against coastal erosion. Nonstructural strategies such as land-use restrictions, prohibiting development and mandating minimum setback from the coast have been used to slow the process of erosion naturally.
Pros
Cons
Pictures
Pros
Cons
Pictures
Cons
Pros
"Coastlines are the most geologically active zones on Earth, where atmosphere, geosphere, hydrosphere, and biosphere all affect the local environments."
Coastal erosion happens along the coast of every beach around the world, because it is a natural process. However, this natural process has accelerated and is currently causing many problems along our coastlines. In order to slow down the affects of coastal erosion certain types of stabilization are used: hard, soft, and nonstructural stabilization.

Doesn't cost as much as other methods
Creates natural buffer to protect shoreline from erosion
Minimizes property damage
Can trap sediment and allow for increased vegetation
Maintains natural habitat features and dynamics of shoreline
Not suitable for high energy environments
May require ongoing maintenance
google images
Above Right: The house with the red roof was sitting back a minimal distance from the shore, but the shoreline eroded causing the property damage.
Above Left: The diagram shows the importance of natural vegetation, and the need to move houses away from shorelines. Human activity, such as construction, can cause erosion because they harm natural processes that fight erosion.
Beach nourishment:
-restores and widens the recreational beaches
-Structures behind the beaches are better protected as long as the added sand remains.
-When erosion continues beach nourishment does not leave hazards on the beach
Control Vegetation:
-Environmentally friendly
-Low cost
Beach Nourishment:
-Very expensive, costing over one million dollars per mile of beach
-Ex: It cost over 17.5 million dollars per mile of beach in Miami to add sand.
Control Vegetation:
- Time required for vegetation to establish
The above left picture shows a ship depositing sand from another inland location .
The above right picture shows a before picture of a beach without much sand and an after picture where they added sand to replace the previously eroded sand.
Sources:
coastalmanagement.noaa.gov
Earth (Thompson/Turk) geology textbook
Images: Google Images
Protects Property
Blocks Wave Energy
Traps Sediment
Quick Fix
Increase Erosion at the End of the Wall
Limits Beach Access
Expensive
Requires Regular Maintenance
Above: These pictures were taken at Fort Fisher, where hard stabilization is allowed because of extreme erosion. Photos taken by: Michalea Cox
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