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Topic: River delta


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  River delta - Wikipedia, the free encyclopedia
A delta is a triangular shaped landform where the mouth of a river flows into an ocean, sea, desert or lake, building outwards (as a deltaic deposit) from sediment carried by the river and deposited as the water current is dissipated.
Deltaic deposits of larger, heavily-laden rivers are characterised by the river channel dividing into multiple streams (distributaries), these divide and come together again to form a maze of active and inactive channels.
Other rivers with notable deltas include the Ganges/Brahmaputra combination (this delta spans most of Bangladesh and West Bengal), the Niger, the Amazon, the Mississippi, the Sacramento-San Joaquin, the Rhine, the Rhône, the Danube, the Ebro, the Volga, the Lena, the Tigris-Euphrates, the Indus, the Krishna-Godavari, the Kaveri, the Ayeyarwady, and the Mekong.
en.wikipedia.org /wiki/River_delta   (436 words)

  
 Mississippi River Delta - Wikipedia, the free encyclopedia
The Mississippi River Delta is the modern area of land (the river delta) built up by alluvium deposited by the Mississippi River as it slows down and enters the Gulf of Mexico.
Each Mississippi River deltaic cycle was initiated by a gradual capture of the Mississippi River by a distributary which offered a shorter and steeper route to the Gulf of Mexico.
They did so by building the Old River Control Structure which consisted of massive floodgates that could be opened and closed as needed at the entrance to the Old River.
en.wikipedia.org /wiki/Mississippi_River_Delta   (871 words)

  
 Indus River Delta - Wikipedia, the free encyclopedia
The delta covers an area of about 16,000 square miles (41,440 sq km), and is approximately 130 miles across where it meets the sea.
Unlike many other deltas, the Indus River Delta consists of clay and other infertile soils, and is very swampy.
The Indus River Delta is an important region for migrating water birds, and is an area rich in freshwater fauna.
en.wikipedia.org /wiki/Indus_River_Delta   (225 words)

  
 Sacramento's Delta History
Though the Delta is most commonly enjoyed for its waterways and related activities, it can also be appreciated for its historical value, having many fine, old houses and buildings.
Steam-powered dredges began to be used to move the large volume of alluvial soils from the river channels to construct the large levees.
Delta Atlas provides information for readers who wish to understand the complex interrelationships within the Delta and grasp its significance to the State.
www.sacdelta.com /hist.html   (1736 words)

  
 Pearl_River_Delta
The Pearl River Delta (PRD, Chinese: 珠江三角洲; Mandarin Pinyin: Zhū Jiāng Sānjiǎozhōu; Cantonese IPA: /tsy
Although the Pearl River Delta Economic Zone encompasses only 0.4 percent of the land area and only 3.2 percent of the 2000 Census population of mainland China, it accounted for 8.7 percent of GDP, 32.8 percent of total trade, and 29.2 percent of utilised foreign capital in 2001.
The Pearl river delta is notoriously polluted, with sewage and industrial waste facilities failing to keep pace with the growth in population and industry in the area.
www.brainyencyclopedia.com /encyclopedia/p/pe/pearl_river_delta.html   (1231 words)

  
 GORP - Delta River, Alaska
Elevation at the Tangle Lakes is approximately 2,800 feet; the drainage falls 650 feet in 51 river miles for an average gradient of 12.7 feet/mile.
From this point, the river portion of the trip is 20 miles to the takeout point at MP 212.5 on the Richardson Highway.
Salmon are not found in the Delta due to the 15-foot high Delta River Falls and the heavy silt load entering from Eureka Creek.
gorp.away.com /gorp/resource/us_river/ak_delta.htm   (1363 words)

  
 Mississippi River: mississippi river delta
Confluence of the Mississippi and Ohio Rivers at Cairo, Illinois.
The river is divided into the upper Mississippi, from its source south to the Ohio River, and the lower Mississippi, from the Ohio to its mouth near New Orleans.
Louis; and the middle Mississippi, a relatively free-flowing river downstream of the confluence with the Missouri River at St. Louis.
winelib.com /wiki/Mississippi_River   (3994 words)

  
 Colorado River Delta | about the delta
Godfrey Sykes, engineer, cowboy, explorer, and author of several early studies of the Colorado River Delta in the first half of the century, opened one paper with the statement "It can truly be said of the Colorado that it is the most seen but least known of all the great Western rivers" (Sykes, 1937).
However, the enigmatic quality attributed to the river by Sykes is still applicable to the river's delta.
In an age of increasing access to, and knowledge of, much of the Earth's surface, the Colorado River Delta remains an area that is visited by few, and understood by still fewer.
www.ag.arizona.edu /colorado_river_delta/delta/background.html   (672 words)

  
 Uniformitarianism in the Mississippi River Delta   (Site not responding. Last check: 2007-10-22)
For the Mississippi, the river mouth is the point where the seaward flowing water leaves the confines of the river channel and flows into the Gulf of Mexico.
At the river mouth, current velocity is reduced, resulting in the deposition of coarse-grained sediments near the river mouth and deposition of the fine-grained particles further offshore.
In conclusion, the Mississippi River Delta is the result of sequences of channel meanders and migrations, river mouth progradations, and delta platform growths followed by river channel and delta abandonment.
www.cox-internet.com /coop/deltawebpage.html   (1657 words)

  
 Find out the geography of the Arkansas Delta & Mississippi River Flood of 1927 history
The most recent of the deltaic lobes is also referred to as the "delta" or sometimes the "modern" or "bird's foot" delta and is the area below New Orleans at the present mouth of the river where the channel forks into the various passes.
The dynamic character of the Delta's ever-changing natural processes are found in a variety of fascinating events-the New Madrid earthquakes of 1811-1812, the devastating flood of 1927, and the geologic curiosity of Crowley's Ridge.
The southeastern lowlands are comprised of the Gulf Coastal Plain, the Mississippi Alluvial Plain (the Delta), and Crowley's Ridge.
www.deltaculturalcenter.com /geography   (1525 words)

  
 BLM-Alaska River Management Plan - Delta River, Part 2   (Site not responding. Last check: 2007-10-22)
The recreational stretch of river is paralleled by the Richardson Highway at a distance of 50 feet to one mile.
Aircraft are currently used within the river corridor to get to mining claims and hunting and fishing areas by landing at the Tangle Lakes, or on a slow stretch of the Delta River upstream from the Eureka Creek confluence, or on one airstrip that is used for a group of mining claims.
The clearwater stretch of the river corridor including Tangle Lakes, Tangle River, and the Delta River downstream to its confluence with Eureka Creek is clear and free of debris and objectionable odor or colors.
www.blm.gov /ak/gdo/delta/part2.html   (3238 words)

  
 Myanmar River Cruise : Delta Queen   (Site not responding. Last check: 2007-10-22)
The steel hulled vessel is 148 ft. long with a beam of 28 ft and a draft of 5 ft. Purpose built for plying the waters in the Delta region of the mighty Ayeyarwaddy (Irrawaddy) River.
The Irrawaddy or Ayeyarwady Delta itself is a vast basin stretching from the coast of the Bay of Bengal across to the Bago Range.
The delta is populated by fairy large towns of Pathein, Myaung Mya, Wakhema, Ma U Bin and Twente, of which the most interesting places are Twente and Pathein.
www.myanmar-rivercruises.com   (947 words)

  
 State of the Environment Norway - Cultural and natural landscapes
River deltas are valuable as nesting and feeding sites for numerous species of birds, in addition to being resting places during spring and autumn migrations.
River deltas are vulnerable to human encroachment like harbors, industrial installations, land reclamataion, aquaculture, hydropower, cultivation, sewage and oil pollution.
The development of the delta in the river Orkla, Sør-Trøndelag County 1962-1992 represents a development typical for larger river deltas in Norway in this period.
www.grida.no /soeno98/landscap/r-delta.htm   (180 words)

  
 Mississippi River Delta Basin
Each Mississippi River deltaic cycle was initiated by a gradual capture of the Mississippi River by a distributary which offered a shorter route to the Gulf of Mexico.
The Mississippi River Delta Basin comprises approximately 521,000 acres of land and shallow estuarine water area in the active Mississippi River delta.
Since the river is no longer free to alter its course and leave its banks to inundate vast coastal areas, the effects of human and natural forces which promote wetland deterioration are compounded.
www.lacoast.gov /geography/basins/mr   (956 words)

  
 Environmental Defense - The Colorado River Delta
On the map the Delta was bisected by the river, but in fact the river was nowhere and everywhere, for he could not decide which of a hundred green lagoons offered the most pleasant and least speedy path to the Gulf.
Even in its diminished state, the delta continues to provide the most important wetland habitat in the southwestern desert of North America and more native riparian habitat than on the rest of the lower Colorado River.
The positive effects this water has had on an otherwise beleaguered and forgotten, but highly capable ecosystem suggest the water should be committed to the region, where it is invaluable to a host of plants and wildlife and to the continued way of life of the native peoples.
www.environmentaldefense.org /article.cfm?ContentID=2641   (540 words)

  
 NOW with Bill Moyers. Science & Health. Losing Ground - Delta Overview | PBS
NOW presents the story of the disappearing delta in two parts: "Losing Ground," uncovers how one of the biggest civil engineering projects in U.S. history — the leveeing of the Mississippi River — has brought Louisiana and the nation to the brink of what could be the most costly environmental disaster in history.
The vast river system of the Mississippi and its tributaries carries with it tons of sediment, and it is this alluvial system that created the wetlands in southern Louisiana.
The construction of an extensive levee system along the Mississippi River from the 1950s to the 1970s, with the goal of maintaining navigation and reducing the flooding of adjacent homes and businesses, has prevented the coastal wetlands from receiving their regular nourishment of riverine water, nutrients, and sediment, a diet critical to wetland survival.
www.pbs.org /now/science/delta.html   (1267 words)

  
 Gulf Coast's Mississippi Delta
The coastal wetlands associated with the Mississippi River delta make up nearly 40 percent of the total coastal salt marsh in the lower 48 states of the U.S. These wetlands are disappearing at an average rate of 25 square miles per year, about 50 acres each day.
Although subsidence is a natural process, human interference with river and sediment flow and withdrawal of groundwater have exacerbated it.
River channelization for flood control and navigation has shunted fresh water to the continental shelf.
www.ucsusa.org /gulf/gcplacesmis.html   (536 words)

  
 Articles - River delta   (Site not responding. Last check: 2007-10-22)
A delta is the mouth of a river where it flows into an ocean, sea, desert or lake, building outwards (as a deltaic deposit) from sediment carried by the river and deposited as the water current is dissipated.
At the final course of a river, when it enters the sea, it mixes with the surrounding water, and its velocity of flow is checked, causing it to deposit its load of gravel, sand, silt and clay.
The Okavango Delta is an example of a delta with no outlet to the sea.
www.dotwater.com /articles/River_delta   (474 words)

  
 Coast & Ocean Winter 20001-2002 Colorado River Delta
Before the dams were built, the Colorado River delta extended over two million acres, an area almost the size of Rhode Island, rich with nutrients brought downriver with tons of silt.
By the 1930s the demand for Colorado River water to sustain farms and cities in the expanding western U.S. seemed to be sounding the death knell for this aquatic wilderness.
As the river was dammed and its water diverted, the riverside forests, green lagoons, and cattail wetlands receded.
ceres.ca.gov /coastalconservancy/coast&ocean/winter2002/pages/six.htm   (2610 words)

  
 The Colorado River Delta: Costs and Compromises
The wonderful grass on Isla Montague was adapted to saltwater and a spring flood of freshwater from the river.
Paddling through the Colorado River Delta in 1922, Aldo Leopold was entranced by a vast, flourishing world beyond the tip of his canoe.
He needed to determine the value of habitats in the entire lower Colorado River area, how much of the delta was originally floodplain, how many acres were mixed saltwater/freshwater areas called estuaries, and how much of the area had been desert.
www.uagrad.org /Alumnus/Fall04/delta.html   (1730 words)

  
 Anderson River Delta   (Site not responding. Last check: 2007-10-22)
The sanctuary consists of 1083 km² of the Anderson River, a delta-estuary, and the adjoining portion of Wood Bay.
The land of the inner delta is flat and dotted with shallow lakes and lush marshy meadows.
The inner delta is used by approximately 150 breeding and 1,200 non-breeding Tundra Swans for nesting purposes.
collections.ic.gc.ca /sanctuaries/nwt/anderson.htm   (611 words)

  
 DOI: BLM: Glennallen Field Office Home Page   (Site not responding. Last check: 2007-10-22)
To explore the Upper Tangle Lakes, use the boat launch at the Delta National Wild and Scenic River Wayside at mile 21.5 of the Denali Highway.
Waterfowl are hunted on the Tangle Lakes in autumn and ptarmigan are hunted among the low hills and valleys of the area in autumn and late winter.
Salmon are not found in the Delta due to the 15-foot-high falls and the heavy silt load entering from Eureka Creek.
www.blm.gov /ak/gdo/delta1.html   (1319 words)

  
 WHOI : Oceanus : The Once and Future Danube River Delta
The history of the 6,000-year-old river delta is written in the sand and soil buried beneath the wetlands.
The Danube Delta is also a great place for a geologist to study how the coast stretches, contracts, and undulates with time and human interference.
The traditional understanding of deltas holds that the river carries all the mud and sand deposited at the river mouth.
www.whoi.edu /oceanus/viewArticle.do?id=5470&archives=true&sortBy=printed   (1209 words)

  
 Float Guide Delta Clearwater River
The Delta Clearwater River is the largest spring-fed tributary of the Tanana.
This crystal clear river is 20 miles long and flows into the Tanana River 20 miles upstream of the Richardson Highway Bridge.
Avoid sweepers (trees in the river, especially those still attached to riverbanks and islands), try to stay on the main channel, and always wear life vests.
www.dnr.state.ak.us /parks/units/deltajct/floatgde.htm   (449 words)

  
 EO Newsroom: New Images - Ebro River Delta, Northeastern Spain   (Site not responding. Last check: 2007-10-22)
The Ebro delta has grown rapidly—the historical rate of growth of the delta is demonstrated by the city of Amposta.
The rounded form of the delta attests to the balance between sediment deposition by the Ebro River and removal of this material by wave erosion.
The modern delta is in intensive agricultural use for rice, fruit, and vegetables.
earth.jsc.nasa.gov /EarthObservatory/EbroRiverDeltaNortheasternSpain.htm   (366 words)

  
 WWF - Danube River Delta - A Global Ecoregion
The Danube delta, one of the largest wetlands in Europe is a unique habitat of canals, reed beds, lakes, and ponds.
The delta is an important site for breeding populations of a number of rare or imperiled waterbirds, including the Dalmatian pelican (Pelecanus crispus), White pelican (Pelecanus onocrotalus), Water rail (Rallus aquaticus), Pygmy cormorant (Phalacrocorax pygmeus), and Collared pratincole (Glareola pranticola).
Pollution, damming, industrialisation, agriculture, livestock, and urban settlements disrupt the fragile ecology of the delta.
www.panda.org /about_wwf/where_we_work/ecoregions/danube_river_delta.cfm   (321 words)

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