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| White Sands |
White SandsWhite Sands can refer to the
missile range, the monument, a film or a location in New Mexico. The dunes of the White Sands and the monument are not co-extensive.
White Sands Missile RangeWhite Sands Missile Range (WSMR), formerly known as the White Sands Proving Grounds, is located in Otero County, New Mexico, in the Tularosa Basin, a valley between the Organ Mountains, San Andres Mountains and the Sacramento Mountains of New Mexico.
The White Sands are actually gypsum crystals which have leached out of the surrounding mountains. A distinctive ecology survives in this desert. Visitors may explore the dunes in the White Sands National Monument, located in the range.
The range was sufficiently desolate to house the Trinity site, and become named Jornada del Muerto. After the V-2 rockets of Peenemünde were captured in World War II, the rockets and the rocket scientists were taken to WSMR for reverse engineering. Today, seventy miles to the south, the US Army Air Defense Center, in Fort Bliss, Texas and WSMR form a contiguous swath of territory devoted to the art. Fort Bliss has an outdoor museum display of rocket-propelled missiles.
The German connection lives on as well, in El Paso Deutsche Schule, and Alamogordo Deutsche Schule, to teach the German children of the soldiers who will later return to Germany after their tours of duty in New Mexico and Texas.
At Change of Command ceremonies on November 30, 2005, a civilian, Tom Bernard, was named director of WSMR upon the retirement of Brig. Gen. Robert J. Reese from the Army, after 35 years of service. Brig. Gen. Michael J. Combest, Commander of the U.S. Army Developmental Test Command emphasized that Tom Bernard is in charge of WSMR. There have been 6 general officers in command at WSMR since 1994; Reese's tenure has been the longest, at 28 months, during that period. Bernard had been the highest-ranking civilian at the Range. Officials at the Department of the Army have said that as soon as the Army can get enough generals to staff all the command positions, the Army will appoint a general officer to lead WSMR. The appointment is expected to take at least six months and could take longer.
2005.]]
WSMR is located on U.S. 70 between Alamogordo and Las Cruces; the highway is sometimes closed for safety reasons while tests are conducted on the missile range.
On just one occasion, STS-3, the NASA space shuttle made a landing at Northrup Strip, 45 miles due north of WSMR Headquarters, when both Kennedy Space Center in Florida and Edwards Air Force Base in California were unable to accommodate a landing due to weather. In the movie SpaceCamp, the shuttle is depicted as landing here after missing a chance to land at Edwards.
Espionage
There have been a number of spies at White Sands over the years, and not all of them were caught. For example, the true identity of the post-WWII Soviet spy code-named Perseus is still unknown.
Note
1. Steve Ramirez, Las Cruces Sun-News reprinted as "Director now leads missile range", in the El Paso Times, December 1, 2005 p.6A.
External links
- [http://www.wsmr.army.mil/ WSMR (US Army)]
- [http://www.wsmr-history.org/ WSMR Museum]
-
Category:Rocket launch sites
Category:Otero County, New Mexico
Category:United States Army
Category:United States Army facilities
White Sands (film): This article is about a film, for the location in New Mexico, see monument .
: For the weapons testing facility and spaceport, see missile range .
White Sands is a 1992 movie directed by Roger Donaldson and written by Daniel Pyne for Warner Bros. The movie is about a small U.S. southwestern town sheriff who finds a body in the White Sands desert with a suitcase and $500,000. He impersonates the man and stumbles into an FBI investigation. It stars Mickey Rourke, Willem Dafoe and Mary Elizabeth Mastrantonio.
External link
- [http://www.imdb.com/title/tt0105813/ IMDb entry for White Sands]
Category:1992 films
Dune:This article is about the sand formations, for other meanings see Dune (disambiguation).
Dune (disambiguation)]
In physical geography, a dune is a hill of sand built by eolian (wind-related) processes. Bare dunes are subject to shifting location and size based on their interaction with the wind. The "valley" or trough between dunes is called a slack.
Some coastal areas have one or more sets of dunes running parallel to the shoreline directly inland from the beach. In most such 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 also form under the action of water flow (Alluvial processes), on sand or gravel beds of rivers, estuaries and the sea-bed.
Types of dune
Crescentic
The most common dune form on Earth (and on Mars) is the crescentic. Crescent-shaped mounds generally are wider than long. The slipface is on the dune's concave side. These dunes form under winds that blow from one direction, and they also are known as barchans, or transverse dunes. Some types of crescentic dunes move faster over desert surfaces than any other type of dune. A group of dunes moved more than 100 meters per year between 1954 and 1959 in China's Ningxia Province; similar rates have been recorded in the Western Desert of Egypt. The largest crescentic dunes on Earth, with mean crest-to-crest widths of more than 3 kilometers, are in China's Taklamakan Desert.
Linear
Straight or slightly sinuous sand ridges typically much longer than they are wide are known as linear dunes. They may be more than 160 kilometers long. Linear dunes may occur as isolated ridges, but they generally form sets of parallel ridges separated by miles of sand, gravel, or rocky interdune corridors. Some linear dunes merge to form Y-shaped compound dunes. Many form in bidirectional wind regimes. The long axes of these dunes extend in the resultant direction of sand movement.
Star
Radially symmetrical, star dunes are pyramidal sand mounds with slipfaces on three or more arms that radiate from the high center of the mound. They tend to accumulate in areas with multidirectional wind regimes. Star dunes grow upward rather than laterally. They dominate the Grand Erg Oriental of the Sahara. In other deserts, they occur around the margins of the sand seas, particularly near topographic barriers. In the southeast Badain Jaran Desert of China, the star dunes are up to 500 meters tall and may be the tallest dunes on Earth.
Dome
Oval or circular mounds that generally lack a slipface, dome dunes are rare and occur at the far upwind margins of sand seas.
Badain Jaran Desert]
Parabolic
U-shaped mounds of sand with convex noses trailed by elongated arms are parabolic dunes. Sometimes these dunes are called U-shaped, blowout, or hairpin dunes, and they are well known in coastal deserts. Unlike crescentic dunes, their crests point upwind. The elongated arms of parabolic dunes follow rather than lead because they have been fixed by vegetation, while the bulk of the sand in the dune migrates forward.
;
Combined types
Badain Jaran Desert, one of the tallest in the world.]]
Occurring wherever winds periodically reverse direction, reversing dunes are varieties of any of the above types. These dunes typically have major and minor slipfaces oriented in opposite directions.
All these dune types may occur in three forms: simple, compound, and complex. Simple dunes are basic forms with a minimum number of slipfaces that define the geometric type. Compound dunes are large dunes on which smaller dunes of similar type and slipface orientation are superimposed, and complex dunes are combinations of two or more dune types. A crescentic dune with a star dune superimposed on its crest is the most common complex dune. Simple dunes represent a wind regime that has not changed in intensity or direction since the formation of the dune, while compound and complex dunes suggest that the intensity and direction of the wind has changed.
Coastal dunes
Dunes form on coasts where the backshore can support and onshore winds encourage the accumulation of sand blown inland from off a beach. Any part of the upper beach, once dry, can lose sand to the wind, especially if the sand is fine, and dune formation proceeds in the direction towards which the predominant wind direction is blowing.
Dunes provide privacy and shelter from the wind.
Succession on coastal dunes
wind]]
As a dune forms, plant succession occurs. The conditions on an embryo dune are harsh, with salt spray from the sea carried on strong winds. The dune is well drained and often dry. Rotting sea weed brought in by storm waves adds enough nutrients to allow pioneer species to colonise the dune. These pioneer species are marram grass, sea wort grass and other sea grasses in England. These plants are well adapted to the harsh conditions of the fore dune, typically having deep roots which reach the water table, root nodules that produce nitrogen compounds, and protected stoma, reducing transpiration. The deep roots also bind the sand together, and the dune grows into a fore dune as more sand is blown over the grasses. The grasses add nitrogen to the soil, meaning other, less hardy plants can then colonise the dunes. Typically these are heathers and gorses. These too are adapted to the low soil water content and have small, prickley leaves which reduce transpiration. Heathers add humus to the soil, but have a pH of lower than 7, so make the soil slightly acidic. Heathers are usually replaced by coniferous trees which can tolerate the low pH. Coniferous forests and heathland are common climax communities for sand dune systems.
Young dunes are called yellow dunes, dunes which have high humus content are called grey dunes. Leaching occurs on the dunes, washing humus into the slacks, and the slacks may be much more developed than the exposed tops of the dunes.
For the snow analogue to a sand dune see sastruga.
Sub-Aqueous dunes
Sub-Aqueous (underwater) dunes form on a bed of sand or gravel under the actions of water flow. They are ubiquitous in natural channels such as rivers and estuaries, and also form in engineered canals and pipelines. Dunes move downstream as the upstream slope is eroded and the sediment deposited on the downstream or lee slope.
These dunes most often form as a continuous 'train' of dunes, showing remarkable similarity in wavelength and height.
Dunes on the bed of a channel significantly increase flow resistance, their presence and growth playing a major part in river flooding.
Longitudinal and Transverse Dunes
Longitudinal dunes, also called Seif dunes, elongate parallel to the prevailent wind, possibly caused by a larger dune having its smaller sides blown away. Seif dunes are sharp-crested and are common in the Sahara. They range up to 300 m (900 ft) in height and 300 km (200 mi) in length.
Seif dunes are thought to develop from barchans if a change of wind direction occurs. The new wind direction will lead to the development of a new wing and the overdevelopment of one of the original wings. If the prevailing wind then becomes dominant for a lengthy period of time the dune will revert to its barchan form, with one exaggerated wing. Should the strong wind then return the exaggerated wing will further extend so that eventually it will be supplied with sand when the prevailing wind returns. The wing will continue to grow under both wind conditions, thus producing a seif dune. On a seif dune the slip face develops on the side facing away from the strong wind, while the slip face of a barchan faces the direction of movement. In the sheltered troughs between highly developed seif dunes barchans may be formed because the wind is unidirectional.
A transverse dune is horizontal to the prevailing wind, probably caused by a steady buildup of sand on an already existing minuscule mound.
Also, the tranversional altitude of the stratosphere exceeds expectations of the previously identifiedj
Lithified dunes
A lithified (consolidated) sand dune is a type of sandstone that is formed when a marine or eolian sand dune becomes compacted and hardened. Once in this form, water passing through the rock can carry and deposit minerals, which can alter the hue of the rock. Cross-bedded layers of stacks of lithified dunes can produce the cross-hatching patterns, such as those seen in Zion National Park.
A local slang term used for these consolidated dunes is "slickrock", a name that was introduced by pioneers of the old west because their steel-rimmed wagon wheels could not gain purchase on the rock.
References & Links
- The Physics of Blown Sand (1941) by Ralph Bagnold
Examples
- The Kelso Dunes, in the Mojave desert of California.
Sand dune plains
:(large expanses of dunes)
- Great Sand Dunes National Park
- Mesquite Flat Dunes, USA
- Western Sahara
- White Sands National Monument
- Rig-e Jenn in the Central Desert of Iran
- The Great Sand Dunes of southwest Saskatchewan
- Southeastern Shore of Lake Michigan
- Imperial Sand Dunes near Brawley, California
- Guadalupe-Nipomo Dunes, Central Coast California, see Dunes Center, Guadalupe, CA
Sand dune systems
:(coastal dunes featuring succession)
- Studland, Dorset, England
- Murlough Sand Dunes, Newcastle, Co Down, Northern Ireland
- Morfa Harlech Sand Dunes, Snowdonia, North West Wales
External Links
- [http://www.geographyinaction.co.uk/Magilligan/Mag_intro.html Magilligan Dunes, Northern Ireland]
See also
- Earth science
- List of landforms
- Singing Sand Dunes
- Dune (novel)
Category:Landforms
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