Nile River delta, as seen from Earth orbit. The Nile is an example of a wave-dominated delta that has the classic Greek delta (Δ) shape after which river deltas were named.

A delta is a landform that is formed at the mouth of a river, where that river flows into an ocean, sea, estuary, lake, or reservoir. Deltas are formed from the deposition of the sediment carried by the river as the flow leaves the mouth of the river. Over long periods of time, this deposition builds the characteristic geographic pattern of a river delta.

Contrary to popular belief, the term delta was not coined by Herodotus^[1].

Formation[link]

River deltas form when a river carrying sediment reaches either (1) a body of standing water, such as a lake, ocean, or reservoir, (2) another river that cannot remove the sediment quickly enough to stop delta formation, or (3) an inland region where the water spreads out and deposits sediments. When the flow enters the standing water, it is no longer confined to its channel and expands in width. This flow expansion results in a decrease in the flow velocity, which diminishes the ability of the flow to transport sediment. As a result, sediment drops out of the flow and deposits. Over time, this single channel will build a deltaic lobe (such as the bird's-foot of the Mississippi or Ural River deltas), pushing its mouth further into the standing water. As the deltaic lobe advances, the gradient of the river channel becomes lower because the river channel is longer but has the same change in elevation (see slope). As the slope of the river channel decreases, it becomes unstable for two reasons. First, the water under the force of gravity will tend to flow in the most direct course down slope. If the river breaches its natural leaves (i.e., during a flood), it will spill out onto a new course with a shorter route to the ocean, thereby obtaining a more stable steeper slope.^[2] Second, as its slope gets lower, the amount of sheer stress on the bed will decrease, which will result in deposition of sediment within the channel and a rise in the channel bed relative to the floodplain. This will make it easier for the river to breach its levees and cut a new channel that enters the body of standing water at a steeper slope. Often when the channel does this, some of its flow can remain in the abandoned channel. When these channel switching events occur a mature delta will gain a distributary network.

Another way in which these distributary networks may form is from the deposition of mouth bars (mid-channel sand and/or gravel bars at the mouth of a river). When this mid-channel bar is deposited at the mouth of a river, the flow is routed around it. This results in additional deposition on the upstream end of the mouth-bar, which splits the river into two distributary channels. A good example of the result of this process is the Wax Lake Delta in Louisiana.

In both of these cases, depositional processes force redistribution of deposition from areas of high deposition to areas of low deposition. This results in the smoothing of the planform (or map-view) shape of the delta as the channels move across its surface and deposit sediment. Because the sediment is laid down in this fashion, the shape of these deltas approximates a fan. It is closer to an ideal fan the more often the flow changes course because more rapid changes in channel position results in more uniform deposition of sediment on the delta front. The Mississippi and Ural River deltas, with their bird's-feet, are examples of rivers that do not avulse often enough to form a symmetrical fan shape. Alluvial fan deltas, as seen in their name, avulse frequently and more closely approximate an ideal fan shape.

Types of deltas[link]

Lower Mississippi River landloss over time

Delta lobe switching in the Mississippi Delta,  4600 yrs BP,  3500 yrs BP,  2800 yrs BP,  1000 yrs BP,  300 yrs BP,  500 yrs BP,  current

Deltas are typically classified according to the main control on deposition, which is usually either a river, waves, or tides.^[3] These controls have a large effect on the shape of the resulting delta.

Wave-dominated deltas[link]

In wave dominated deltas, wave erosion controls the shape of the delta, although deposition still outweighs the amount of erosion and the delta is able to advance into the sea. Deltas of this form, such as the Nile Delta, tend to have a characteristic Greek-capital-delta shape Failed to parse (Missing texvc executable; please see math/README to configure.): \left(\Delta\right) .

The Ganges Delta in India and Bangladesh is the largest delta in the world and it is also one of the most fertile regions in the world.

Tide-dominated deltas[link]

Erosion is also an important control in tide dominated deltas, such as the Ganges Delta, which may be mainly submarine, with prominent sand bars and ridges. This tends to produce a "dendritic" structure.^[3] Tidal deltas behave differently from river- and wave-dominated deltas, which tend to have a few main distributaries. Once a wave- or river- distributary silts up, it is abandoned, and a new channel forms elsewhere. In a tidal delta, new distributaries are formed during times when there's a lot of water around – such as floods or storm surges. These distributaries slowly silt up at a pretty constant rate until they fizzle out.^[3]

Gilbert deltas[link]

A Gilbert delta (named after Grove Karl Gilbert) is a specific type of delta that is formed by coarse sediments, as opposed to gently-sloping muddy deltas such as that of the Mississippi. For example, a mountain river depositing sediment into a freshwater lake would form this kind of delta.^{[4] [5]} While some authors describe both lacustrine and marine locations of Gilbert deltas,^[4] others note that their formation is more characteristic of the freshwater lakes, where it is easier for the river water to mix with the lakewater faster (as opposed to the case of a river falling into the sea or a salt lake, where less dense fresh water brought by the river stays on top longer).^[6]

G.K. Gilbert himself first described this type of delta on Lake Bonneville in 1885.^[6] Elsewhere, similar structures can be found e.g. at the mouths of several creeks flowing into Okanagan Lake in British Columbia and forming prominent peninsulas at Naramata (49°35′30″N 119°35′30″W / 49.59167°N 119.59167°W / 49.59167; -119.59167), Summerland (49°34′23″N 119°37′45″W / 49.57306°N 119.62917°W / 49.57306; -119.62917), or Peachland (49°47′00″N 119°42′45″W / 49.7833333°N 119.7125°W / 49.7833333; -119.7125)

Estuaries[link]

Other rivers, particularly those located on coasts with significant tidal range, do not form a delta but enter into the sea in the form of an estuary. Notable examples include the Saint Lawrence River and the Tagus estuary.

Inland deltas[link]

Okavango Delta

In rare cases the river delta is located inside a large valley and is called an inverted river delta. Sometimes a river will divide into multiple branches in an inland area, only to rejoin and continue to the sea; such an area is known as an inland delta, and often occur on former lake beds. The Inner Niger Delta and Peace–Athabasca Delta are notable examples. The Amazon has also an inland delta before the island of Marajó.

In some cases a river flowing into a flat arid area splits into channels which then evaporate as it progresses into the desert. Okavango Delta in Botswana is one well-known example.

Sedimentary structure[link]

The formation of a delta consists of three main forms: the topset, foreset/frontset, and bottomset.^[4]

• The bottomset beds are created from the suspended sediment that settles out of the water as the river flows into the body of water and loses energy. The suspended load is carried out the furthest into the body of water than all other types of sediment creating a turbidite. These beds are laid down in horizontal layers and consist of smaller grains.
• The foreset beds in turn build over the bottomset beds as the main delta form advances. The foreset beds consist of the bed load that the river is moving along which consists of larger sediments that roll along the main channel. When it reaches the edge of the form, the bed load rolls over the edge, and builds up in steeply angled layers over the top of the bottomset beds. The angle of the outermost edge of the delta is created by the sediments angle of repose. As the foresets build outward (which make up the majority of the delta) they pile up and miniature landslides occur. This slope is created in this fashion as the bedload continues to be deposited and the delta moves outward. In cross section, one would see the foresets lying in angled, parallel bands, showing each stage of the creation of the delta.
• The topset beds in turn overlay the foresets, and are horizontal layers of smaller sediment size that form as the main channel of the river shifts elsewhere and the larger particles of the bed load no longer are deposited. As the channels move across the top of the delta, the suspended load settles out in horizontal beds over the top. The topset bed is subdivided into two regions: the upper delta plain and the lower delta plain. The upper delta plain is unaffected by the tide, while the boundary with the lower delta plain is defined by the upper limit of tidal influence. ^[7]

Deltas and alluvial fans[link]

Deltas are differentiated from alluvial fans in that deltas have a shallow slope, contain fine-grained sediment (sand and mud), and always flow into a body of water. Alluvial fans, on the other hand, are steep, have coarse-grained sediments (including boulders), and are dominated by debris flows and large floods; these floods are often flash floods. They can either flow onto a land surface, or into a body of water; in the latter case, they are called alluvial fan deltas.

Examples of notable deltas[link]

The most famous delta is that of the Nile River, and it is this delta from which the term is derived. The Ganges/Brahmaputra combination delta spans most of Bangladesh and West Bengal, empties into the Bay of Bengal and is the world's largest delta. Other rivers with notable deltas include, the Fly River, the Cauvery, the Niger River, the Tigris-Euphrates, the Rhine, the Po, the Rhône, the Danube, the Ebro, the Volga, the Lena, the Indus, the Ayeyarwady (Irrawaddy), the Mekong, the Huanghe, the Yangtze, the Sacramento-San Joaquin, the Mississippi, the Orinoco, and the Paraná.

Ecological threats to deltas[link]

Human activities, including diversion of water and the creation of dams for hydroelectric power or to create reservoirs can radically alter delta ecosystems. Dams block sedimentation which can cause the delta to erode away. The use of water upstream can greatly increase salinity levels as less fresh water flows to meet the salty ocean water. While nearly all deltas have been impacted to some degree by humans, the Nile Delta and Colorado River Delta are some of the most extreme examples of the ecological devastation caused to deltas by damming and diversion of water.

Deltas in the economy[link]

Ancient deltas are a benefit to the economy due to their well sorted sand and gravel. Sand and gravel is often quarried from these old deltas and used in concrete for highways, buildings, sidewalks, and even landscaping. More than 1 billion tons of sand and gravel are produced in the United States alone.^[8] Not all sand and gravel quarries are former deltas, but for ones that are, a lot of the sorting is already done by the power of water.

Deltas on Mars[link]

Researchers have found a number of examples of deltas that formed in Martian lakes. Finding deltas is a major sign that Mars once had a lot of water. Deltas have been found over a wide geographical range. Below are pictures of a few.^[9]

• 

  Delta in Ismenius Lacus quadrangle, as seen by THEMIS.

• 

  Delta in Lunae Palus quadrangle, as seen by THEMIS.

• 

  Delta in Margaritifer Sinus quadrangle as seen by THEMIS.

• Distributary fan-delta.jpg

  Probable delta in a crater to the NE of Holden Crater, as seen by Mars Global Surveyor. Image in Margaritifer Sinus quadrangle.

See also[link]

• Alluvial fan
• Avulsion (river)
• Estuary
• Formation of delta-shaped river basin
• Mega delta
• Regressive delta

References[link]

Wikimedia Commons has media related to: River deltas

External links[link]

• Louisiana State University Geology – World Deltas

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Alexandra Marguerite Clémentine Cousteau (born March 21, 1976) is the daughter of Philippe Cousteau and the granddaughter of world famous French explorer and filmmaker Jacques-Yves Cousteau.^[2][3] A dedicated environmentalist, Cousteau advocates the importance of conservation, restoration and sustainable management of water resources for a healthy planet and productive societies.^[2]

A member of the third generation of the Cousteau family to devote their lives to exploring and explaining the natural world, Cousteau first went on expedition with her father, Philippe Cousteau, when she was four months old, and learned to scuba dive with her grandfather, Jacques-Yves Cousteau, when she was seven.^[1][4] She grew up traveling the globe, developed a passion for adventure and learned firsthand the value of conserving the natural world. Of her father and grandfather, Cousteau says, "The best example they gave me was the importance of living a life of consequence, value, and meaning. I honor their memories by creating a legacy of my own in speaking out for the preservation of our blue planet and all its waters."^[2]

Born in California, Cousteau grew up in France and the United States. She earned her Bachelor of Science degree in Political Science (International Relations) from Georgetown University in Washington DC. In 2000, Alexandra co-founded EarthEcho International with her brother Philippe Cousteau Jr. to further her family’s legacy in science, advocacy, and education.^[5][6][7]

Alexandra was selected as a National Geographic Emerging Explorer for the Class of 2008.^[8] She has spoken to audiences at the United Nations, UNESCO, Harvard University, Smithsonian Institution and Sea Rovers, among numerous other institutions, film festivals, and other events internationally. Cousteau is also a published author whose articles and/or columns have appeared in the Woodrow Wilson Center journal, Washington Life magazine, VSD (France), and Elle magazine(Spain) among others. She sits on the Board of Directors of EarthEcho International and the Global Water Challenge, Science Advosory Board for George Mason University and the steering committee of the Pew sponsored Shark Alliance. She is also a PADI-certified Divemaster. Alexandra is fluent in English, French and Spanish. She has served as a keynote speaker on environmental issues for the United Nations, National Geographic, Harvard University, the Smithsonian, the National Press Club, Bioneers and the Telluride Film Festival. Alexandra is regularly featured on CNN International as a Principal Voice.

In 2008, Alexandra was named with Tyra Banks as a 2008 Fun Fearless Phenom by Cosmopolitan magazine.

In 2008, Cousteau established the Blue Legacy organization to continue her family's work in protecting the Earth's oceans.^[2][4] Since its inception, Blue Legacy has been on a mission to explore crucial water issues across the globe. Blue Legacy's mission takes form in three ventures; Expedition: Blue Planet, Blue Action Dialogues and Alexandra's upcoming book, "This Blue Planet."

Over the past year the Expedition: Blue Planet has been on a 100 day journey across 5 continents telling 8 critical water stories. Alexandra and Expedition: Blue Planet have filmed in India, Botswana, Cambodia, Australia, the Middle East, the Mississippi River and the Anacostia River in Southeast Washington, D.C. The films from Expedition: Blue Planet were nominated at the 2009 Jackson Hole Wildlife Film Festival in the categories of "Best Web Presence" and "Best Use of Web 2.0/ New Media." The inaugural Blue Action Dialogues will take place October 2009. The sessions will bring together some of the world's leading water scientists, policy experts and innovators to develop an annual platform for Blue Legacy. Slated for a 2010 release, Alexandra is currently working on her first book titled, " This Blue Planet," with Penguin Publishing.

In 2009, Alexandra and her brother Philippe were honored with the legacy award at the South Carolina Aquarium's annual Environmental Stewardship Awards banquet.

In 2009, Alexandra joined the Discovery Channel line-up, co-hosting “Blue August” with her brother Philippe, Jr also serving as a Chief Correspondent on Water Issues for Discovery's Planet Green. In 2009, Alexandra was named a Revo Ambassador, partnering with Revo to become the face of the eyewear company.

Alexandra will be involved with Live Earth 2010, founded by Kevin Wall. This global event will take place on Earth Day 2010.

On May 4, 2011, Alexandra was awarded the 2011 Human Security Award at University of California, Irvine to recognize Cousteau's accomplishments and to raise awareness of the global water crisis.

References[link]

External links[link]

• Blue Legacy, Alexandra Cousteau
• Alexandra's bio
• EarthEcho International
• Alexandra Cousteau at the Internet Movie Database
• El Mundo interview (Spanish)
• Alexandra Cousteau as Revo Ambassador

The PS22 Chorus is an elementary school chorus from Public School 22 in Graniteville, Staten Island (New York). It is composed of 60-70 fifth-graders, and is directed by Gregg Breinberg. Students are assigned to the chorus after an annual auditioning process at the beginning of each school year. PS22 is the largest elementary school in Staten Island which draws students from a wide cross section of ethnic groups and socio-economic levels. The chorus meets twice a week during school hours to practice, and performs throughout the year at school functions, local events, and on special requests.^[1] It has been featured on several major national news and music networks after its videos had gained international attention within the popular video-sharing site YouTube. To date, the chorus’s videos have been watched more than 45,000,000 times.^[2]

History[link]

The PS22 chorus was founded in 2000 by the school's music teacher, Gregg Breinberg, who started blogging about it in September 2006 following requests on a Tori Amos fan page, where he had shared some of his videos. Since then the chorus has become an Internet phenomenon. In 2009 New York magazine called it "the best-known elementary-school chorus on the planet".^[3]

Chorus of 2006/2007

• The chorus performs for singer-songwriter Tori Amos at the Sony Atrium in New York City. (May 4, 2007)^[4]
• Celebrity gossip blogger Perez Hilton starts blogging about the PS22 chorus and becomes an influential supporter.^[4]

Chorus of 2007/2008

• Neil Finn, lead singer of the New Zealand band Crowded House invites the chorus to sing at the band’s sold-out concert in New York. (April 30, 2008)^[4]
• Former student Andrew Canlon composes a song specifically for the PS22 chorus entitled "All My Life".
• Members of the PS22 chorus of 2007/2008 are featured in several videos of the 2009 television series The Electric Company^[5]

Chorus of 2008/2009

• The electronic band Passion Pit invites the PS22 chorus to sing background vocals on three tracks ("The Reeling", "Little Secrets", "Let Your Love Grow Tall") of their debut album Manners. (2009-01-16)^[6] "The Reeling" is later nominated for an MTV Video Music Award as best breakthrough video.^[7]
• The chorus performs with country singer Cooper Boone at a DKMS charity Gala and meets Chelsea Clinton and R&B singer Rihanna. (May 7, 2009)^[3]
• Nightline features an in-depth look at the PS22 Chorus. (June 10, 2009)
• Stevie Nicks (Fleetwood Mac) invites the chorus to sing for her at Madison Square Garden. (June 11, 2009)^[4]
• The chorus performs on Good Morning America (ABC) (June 22, 2009)^[8]
• The chorus appears on It's On with Alexa Chung (MTV). (August 3, 2009)^[9]
• The chorus is featured on the nationally televised VH1 Divas Special 2009 (September 17, 2009)^[10]

Chorus of 2009/2010

• The newly formed chorus of 2009/2010 is visited by the cast (Naturi Naughton, Anna Maria Perez de Tagle, Kherington Payne, Asher Book) and director Kevin Tancharoen of the new 2009 movie Fame. The school is presented a $30,000 check for a new keyboard lab by VH1 Save The Music Foundation Executive Director Paul Cothran, and Director Of Music for New York City Department of Education Barbara Murray. (September 14, 2009)^[11]
• Billboard magazine invites the chorus to perform at an award ceremony for Beyoncé and Lady Gaga. (October 2, 2009) ^[12]
• The chorus performs alongside the Cross Border Orchestra of Ireland at the Cross Cultural Youth Festival held at The Armory, Washington Heights for 2500 children from all five boroughs of New York. The event is covered by Fox5 New York. (October 27, 2009) [1]
• Paul Rieckhoff, founder of IAVA, invites the chorus to sing at the Third Annual Heroes Gala at Gotham Hall in New York, hosted by NBC's Brian Williams. (November 10, 2009)^[13]
• The chorus performs with rapper Common at the National Tree Lighting ceremony at the White House with President Barack Obama and Vice President Joe Biden attending. (December 3, 2009)^[14]
• During their "Songs From the Heart" tour, Celtic Woman visits PS22 and invites the chorus to join them on two songs at their Radio City Music Hall concert. (February 26, 2010)^[15]
• After hearing the chorus's interpretation of his song "One Day", Chasidic reggae artist Matisyahu visits PS22 and invites the chorus to perform two songs at his concert at New York City's 92nd Street Y. (March 16, 2010)^[16]

Chorus of 2010/2011

• The students perform at the charity organization "New Yorkers for Children". (September 22, 2010)
• At the ONEXONE Gala supported by Matt Damon, the children sing with Matisyahu. (October 27, 2010)
• The chorus perform at Iraq and Afghanistan Veterans of America in Manhattan hosted by NBC Anchor Brian Williams. (November 10, 2010)
• The children are visited by Kylie Minogue and perform with her, including the first ever live performance of "Put Your Hands Up (If You Feel Love)". (November 29, 2010)
• The chorus is visited by Bruce Cohen and Anne Hathaway at their 11th Annual Winter Concert and invited to perform at the 83rd Academy Awards. (December 16, 2010)
• The students perform at the 83rd Academy Awards on February 27, 2011.^[17]
• The children perform with Katy Perry on the Oprah Winfrey show post Oscar show at the Kodak Theatre. (February 28, 2011)
• The chorus perform together with The Bangles at the Tribeca Film Festival (April 20, 2011)
• David Cook visits PS22 and performs several songs including "The Last Goodbye" and "Rolling in the Deep" with the chorus. (June 10, 2011)
• The group reunites to perform a 40 minute set at the Newport Folk Festival in Rhode Island. (July 30, 2011)
• PS22 Chorus appears on Sesame Street in a video singing the iconic Sesame song "Somebody Come and Play." (October 21, 2011)

Chorus of 2011/2012

• The children are visited by artist V V Brown who performs several songs with the chorus. (November 16, 2011)
• The chorus performed with 30 Seconds to Mars for the songs "Closer to the Edge" and "Kings and Queens" in what was most likely their final concert at Saint Peter's Church in Chelsea, New York. (December 10, 2011)
• The children are visited by artist Susan Justice and film several songs with her. (January 27, 2012)
• PS22 Chorus alumnus Denise Bestman appears in a commercial for Target singing the song "Rolling In The Deep" by Adele which airs during the 2012 Grammys. (February 12, 2012)
• The students perform a tribute to Whitney Houston singing "The Greatest Love of All" on the Piers Morgan Tonight show on CNN. (February 17, 2012)
• Sinéad O'Connor invites PS22 to open up her show at the Highline Ballroom in NYC, and joins the chorus onstage to perform her song "Jackie." (February 24, 2012)
• The kids sing "Bridge Over Troubled Water" to legendary singer-songwriter,Paul Simon, at 2012 New Yorker for New York Gala (February 27, 2012)
• PS22 Chorus performs at NEA's (National Education Association) Read Across America Event at New York Public Library featuring Zac Efron & Danny DeVito in honor of the birthday of Dr. Seuss (March 2, 2012)
• Celtic Woman returns to PS22 and records several songs with the chorus (March 12, 2012)
• PS22 Chorus records a video promo to save music education with Ingrid Michaelson for DoSomething.org in conjunction with Vh1's Save The Music Foundation (March 9, 2012)
• Gym Class Heroes invites PS22 Chorus to take the stage with them at their concert at Wagner College to perform "The Fighter" (April 21, 2012)
• The chorus performed "Good Girl" and "So Small" with Grammy Award-winning artist, Carrie Underwood, when she visits the kids at their school. (April 27, 2012)

Media coverage[link]

TV appearances

• ABC News Nightline (ABC)^[1]
• Good Day New York (Fox 5)^[18]
• MTV News with Sway Calloway (MTV)^[19]
• NBC Nightly News;; (msnbc)^[20]
• Hollywood 411 (TV Guide Network)^[21]
• The Bonnie Hunt Show^[22]
• Anderson Cooper 360° (CNN)^[23]
• RTL Television (German television station)
• 83rd Academy Awards
• The Oprah Winfrey Show (CBS)

Radio appearances

• All Things Considered (NPR)^[24]
• Chris Evans (BBC)^[25]
• Q (CBC)^[26]
• The Howard Stern Show^[27]
• Joan Hamburg (WOR-2)^[28]
• Rubrik 'Musik' (detektor.fm) ^[29]
• Akustischer Adventskalender (detektor.fm) ^[30]

Newspaper/Online Newspaper articles

• The New York Times^[31]
• New York Magazine^[3]
• In June 2009 an Associated Press article by Verena Dobnik brought worldwide attention to the chorus. The article ran in prominent newspapers and on websites like The Guardian,^[32] The Boston Globe,^[33] The Seattle Times,^[34] The Huffington Post^[4] and many more.
• Dein Spiegel (German magazine for children)
• Time (magazine)
• Daily News (New York)
• Los Angeles Times

Visit By Walk The Moon!

Awards[link]

• COAHSi (Council on the Arts & Humanities for Staten Island) Award 2003 and 2009 ^[35]
• Tribeca Disruptive Innovation Award 2010 ^[36]
• Webby Artist of the Year Award 2010 ^[37]
• Common Sense Media Award 2011

References[link]

External links[link]

• Blogspot Homepage
• Official YouTube channel