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Difference between revisions of "Mrauscher/sandbox"

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[[File:Bigbeach.jpg|thumb|390px|Beach fill project under construction]]
 
[[File:Bigbeach.jpg|thumb|390px|Beach fill project under construction]]
 
The majority of beach fill projects involve mining or dredging sand from an offshore source, transporting it to the beach and bulldozing the fill from 100 to 250 ft out into the water. It is an intensive construction project and each part of this process can harm the local environment. This section will briefly describe each part of the process and highlight the potential environmental effects.
 
The majority of beach fill projects involve mining or dredging sand from an offshore source, transporting it to the beach and bulldozing the fill from 100 to 250 ft out into the water. It is an intensive construction project and each part of this process can harm the local environment. This section will briefly describe each part of the process and highlight the potential environmental effects.
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'''Dredging and Mining'''
 
'''Dredging and Mining'''
[[File:Dredge at oceanside harbor 2006-04-12.JPG|390px|thumb|right|This cutterhead suction dredge is used for channel maintenance at Oceanside, CA Harbor.  Sediments from the channel are pumped onto nearby beaches.]]
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[[File:Dredge at oceanside harbor 2006-04-12.JPG|200px|thumb|right|This cutterhead suction dredge is used for channel maintenance at Oceanside, CA Harbor.  Sediments from the channel are pumped onto nearby beaches.]]
 
Approximately 95% of beach fill sand comes from offshore deposits<ref name="NRC">Beach Nourishment and Protection.  National Research Council.  National Academy Press.  1995.</ref>. Sand from these offshore “borrow sites” is usually dredged and piped from the source site to the beach and bulldozed into place. Sand dredged from beyond the 3-mile state limit on the Outer Continental Shelf (OCS) is managed by the [http://www.boem.gov/Non-Energy-Minerals/Marine-Minerals-Program.aspx Marine Minerals Program] of the US Bureau of Ocean Energy Management. Sand is also dredged from inlets, estuaries, lagoons and adjacent beaches where sand accretes. Some of these sources are less common because they sometimes cost more and contain sand that is too fine to use as “beach quality” sand. Other potential sources on land are sand from inland quarries and sand cleaned out of debris basins that trap sediment from floods. Sand dredging and mining have many potential environmental impacts, which a subsequent section will describe in detail.
 
Approximately 95% of beach fill sand comes from offshore deposits<ref name="NRC">Beach Nourishment and Protection.  National Research Council.  National Academy Press.  1995.</ref>. Sand from these offshore “borrow sites” is usually dredged and piped from the source site to the beach and bulldozed into place. Sand dredged from beyond the 3-mile state limit on the Outer Continental Shelf (OCS) is managed by the [http://www.boem.gov/Non-Energy-Minerals/Marine-Minerals-Program.aspx Marine Minerals Program] of the US Bureau of Ocean Energy Management. Sand is also dredged from inlets, estuaries, lagoons and adjacent beaches where sand accretes. Some of these sources are less common because they sometimes cost more and contain sand that is too fine to use as “beach quality” sand. Other potential sources on land are sand from inland quarries and sand cleaned out of debris basins that trap sediment from floods. Sand dredging and mining have many potential environmental impacts, which a subsequent section will describe in detail.
  
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After dredging or mining sand, the beach fill is transported by truck or pipeline and then pumped as a slurry into large piles on the beach. Bulldozers then push the fill out into the planned artificial profile. Some beach fill projects deposit most sand into nearshore sandbars (berms) under the assumption that currents will move sand onto the beach. These activities also have many environmental effects associated with them that will be discussed below.
 
After dredging or mining sand, the beach fill is transported by truck or pipeline and then pumped as a slurry into large piles on the beach. Bulldozers then push the fill out into the planned artificial profile. Some beach fill projects deposit most sand into nearshore sandbars (berms) under the assumption that currents will move sand onto the beach. These activities also have many environmental effects associated with them that will be discussed below.
 
 
  
 
'''Other variations'''
 
'''Other variations'''

Revision as of 13:53, 9 July 2013

How do you fill a beach?

Beach fill project under construction

The majority of beach fill projects involve mining or dredging sand from an offshore source, transporting it to the beach and bulldozing the fill from 100 to 250 ft out into the water. It is an intensive construction project and each part of this process can harm the local environment. This section will briefly describe each part of the process and highlight the potential environmental effects.


Dredging and Mining

This cutterhead suction dredge is used for channel maintenance at Oceanside, CA Harbor. Sediments from the channel are pumped onto nearby beaches.

Approximately 95% of beach fill sand comes from offshore deposits[1]. Sand from these offshore “borrow sites” is usually dredged and piped from the source site to the beach and bulldozed into place. Sand dredged from beyond the 3-mile state limit on the Outer Continental Shelf (OCS) is managed by the Marine Minerals Program of the US Bureau of Ocean Energy Management. Sand is also dredged from inlets, estuaries, lagoons and adjacent beaches where sand accretes. Some of these sources are less common because they sometimes cost more and contain sand that is too fine to use as “beach quality” sand. Other potential sources on land are sand from inland quarries and sand cleaned out of debris basins that trap sediment from floods. Sand dredging and mining have many potential environmental impacts, which a subsequent section will describe in detail.


Sand Fill <html> <iframe src="http://player.vimeo.com/video/14653210" width="400" height="300" frameborder="0" align="right"></iframe> </html>

After dredging or mining sand, the beach fill is transported by truck or pipeline and then pumped as a slurry into large piles on the beach. Bulldozers then push the fill out into the planned artificial profile. Some beach fill projects deposit most sand into nearshore sandbars (berms) under the assumption that currents will move sand onto the beach. These activities also have many environmental effects associated with them that will be discussed below.

Other variations

Some beach fill projects are referred to under names such as sand recycling or sand bypass. Sand recycling projects dredge sand from an area where it accumulates and move it to “refill” the area that eroded. Sand bypass systems move sand past a structure that restricts the flow of sand along the coast, commonly a jetty. Sand is dredged on one side of the structure and then pumped onto on the other side. Some sand recycling or sand bypass systems are permanently installed on the beach and are designed to replace the natural sand flow.

  1. Beach Nourishment and Protection. National Research Council. National Academy Press. 1995.