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Daemon
Posted: Thursday, October 12, 2017 12:00:00 AM
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Joined: 3/7/2009
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Dunes

Dunes are mounds or ridges of wind-blown sand that form in arid regions and along coasts, areas where there is plenty of sand, strong winds, low rainfall, and some vegetation or obstructions to trap the sand. The shape of a dune—crescent, linear, star, dome, or parabolic, to name a few—is dictated by the prevailing wind pattern. Dunes that are not stabilized by vegetation often migrate, driven by the wind, and may cause damage as they move. What are some techniques for halting their migration? More...
raghd muhi al-deen
Posted: Thursday, October 12, 2017 8:25:29 AM

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Joined: 4/19/2017
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Location: Baghdad, Mayorality of Baghdad, Iraq
dune
Also found in: Dictionary, Thesaurus, Medical, Legal, Acronyms, Encyclopedia.
For other uses, see Dune (disambiguation).
Erg Chebbi, Morocco

In physical geography, a dune is a hill of loose sand built by wind or the flow of water.[1] Dunes occur in different shapes and sizes, formed by interaction with the flow of air or water. Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind. The valley or trough between dunes is called a slack. A "dune field" is an area covered by extensive sand dunes. Dunes occur, for example, in some deserts and along some coasts.

Some coastal areas have one or more sets of dunes running parallel to the shoreline directly inland from the beach. In most cases, the dunes are important in protecting the land against potential ravages by storm waves from the sea. Although the most widely distributed dunes are those associated with coastal regions, the largest complexes of dunes are found inland in dry regions and associated with ancient lake or sea beds.

Dunes can form under the action of water flow (fluvial processes), and on sand or gravel beds of rivers, estuaries and the sea-bed.

The modern word "dune" came into English from French c. 1790,[2] which in turn came from Middle Dutch dūne.[1]

with my pleasure
randy max malm
Posted: Thursday, October 12, 2017 12:02:36 PM

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Location: Redding, California, United States
always moving ,on the
orgon coast they move all the time
monamagda
Posted: Thursday, October 12, 2017 12:10:10 PM

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Location: Bogotá, Bogota D.C., Colombia

Sand dune fixation techniques

PRIMARY FIXATION

Mechanical dune stabilization
The initial phase in combating sand encroachment consists of halting or slowing the
movement of sand by erecting fences 1 to 1.5 m high to cause a buildup of sand, leading
to the formation of an artificial dune.

Mulch or protective screen
The mulch technique consists of covering the dune uniformly with a natural or artificial
protective screen to prevent saltation and is adopted especially on flat or reasonably
even surfaces.

Aerodynamic method
This method aims at using the wind’s speed and carrying capacity


BIOLOGICAL FIXATION
After dunes have been mechanically stabilized, they can then be permanently fixed by
planting trees and perennial vegetation.
Choice of woody and grassy species
Planting techniques



http://www.fao.org/docrep/012/i1488e/i1488e04.pdf
ChristopherJohnson
Posted: Thursday, October 12, 2017 2:32:42 PM

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Location: Tbilisi, T'bilisi, Georgia
They seem to be practically unstoppable.
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