(2012) Delta Landscape, Wave-dominated river deltas on coastalwiki.org, List of rivers that have reversed direction, A Directory of Important Wetlands in Australia, Bangladesh Haor and Wetland Development Board, https://en.wikipedia.org/w/index.php?title=River_delta&oldid=999851472, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License, The bottomset beds are created from the lightest suspended particles that settle farthest away from the active delta front, as the river flow diminishes into the standing body of water and loses energy. The city has a population of more than 11 million people, which is more than 26,000 people per .386 square mi (1 square km). Heike Jöns, Heidelberg [HJ] Cuspate Delta. Elliot, T. 1986. Prof. Dr. Rüdiger Glaser, Heidelberg [RGl] Human activities, such as the creation of dams for hydroelectric power or to create reservoirs can radically alter delta ecosystems. in R. G. Walker (ed) Facies Models. Along active margins, orogenic sequences cause tectonic activity to form over-steepened slopes, brecciated rocks, and volcanic activity resulting in delta formation to exist closer to the sediment source. Dr. Franz Köhler, Gotha [FK] The transition between river and ocean, bay or lake is known as a delta. 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Kuenzer 2012: The Mekong Delta System – Interdisciplinary Analyses of a River Delta, Springer, This page was last edited on 12 January 2021, at 07:45. From longshore drift, to climate and legends, as part of our revision series, Nicholas Reed Langen gives advice to … Check facts about coastlines here. Das Wetter bestimmt unseren Alltag. Delta - The area at the mouth of a river formed with deposits brought down the river, for example, the Ganges Delta in India. Deltabildung ist besonders häufig an gezeitenschwachen Binnenmeeren.  For deltas that form further upriver in an estuary, there are complex yet quantifiable linkages between winds, tides, river discharge, and delta water levels. https://www.worldatlas.com/articles/how-many-types-of-deltas-are-there.html In rare cases the river delta is located inside a large valley and is called an inverted river delta. This flow expansion results in a decrease in the flow velocity, which diminishes the ability of the flow to transport sediment. Dr. Hans Jürgen Böhmer, München [HJB] As humans have altered surface roughness, runoff, and groundwater storage, studies have shown river delta retreat. Manfred Eiblmaier, Köln [ME] This results in additional deposition on the upstream end of the mouth-bar, which splits the river into two distributary channels. Noted geographical features in Nigeria include the Adamawa highlands, Mambilla ... for example, Warri town in the southern part of Nigeria, records a maximum of 28 °C (82.4 °F) for its hottest month while its lowest temperature is 26 °C (78.8 °F) in its coldest month. Prof. Dr. Karl Hoheisel, Bonn [KH] The Ganges–Brahmaputra Delta, which spans most of Bangladesh and West Bengal, India empties into the Bay of Bengal, is the world's largest delta. delta. Michael Plattner, Marburg [MP] Diff (Showing top 20 results out of 315) Add the Codota plugin to your IDE and get smart completions How a River Delta Forms. Geographic Information Science (GIS) uses the power of location integrated with computing technologies to analyze large volumes of data to make informed decisions. A typical example of a bird’s foot delta is the Mississippi Delta. PD Dr. Paul Reuber, Münster [PR] Dr. Martin Coy, Tübingen [MC] Ancient deltas are a benefit to the economy due to their well sorted sand and gravel. ... Any change in the geography of the landscape that causes a river channel to bend or rise will slow the flow of water in a river. Robert Fischer M.A., Frankfurt a.M. [RF] Nahe Schanghai liegt Liangzhu. Ein Delta bildet immer einen oder mehrere zusammengesetzte, sehr flache Schwemmfächer, auf denen sich die Flüsse in verschiedene Mündungsarme aufspalten können (Bifurkation). Finding deltas is a major sign that Mars once had large amounts of water. Dipl.-Geogr. Prof. Dr. Dieter Kelletat, Essen [DK] Vom ewigen Eis zu schmelzenden Gletschern und Löchern in der Ozonschicht der Erde - die beiden Polargebiete gehören zu den Schlüsselstellen des Weltklimas. Delta Pictures. Prof. Dr. Patrick Armstrong, Perth (Australien) [PA] Prof. Dr. Hans Heinrich Blotevogel, Duisburg [HHB] Dipl.-Geol. Sometimes a river divides into multiple branches in an inland area, only to rejoin and continue to the sea. Prof. Dr. Karl-Heinz Pörtge, Göttingen [KHP] Bei sonst gleichen Faktoren würde ein steigender Meeresspiegel das Deltawachstum behindern, ein fallender würde es fördern. As the only Geography Masters in Silicon Valley, our program takes advantage of its location to emphasize urban and cultural geography, economic geography, and geospatial methods. Anke Strüver, Nijmwegen [ASt] Despite a popular legend, this use of the word delta was not coined by Herodotus. , The formation of a delta is complicated, multiple, and cross-cutting over time, but in a simple delta three main types of bedding may be distinguished: the bottomset beds, foreset/frontset beds, and topset beds. Gilbert himself first described this type of delta on Lake Bonneville in 1885. Prof. Dr. Wolfgang Haber, München [WHa] This piece of land in in triangle in shape which is similar to the greek letter delta therefore it is known as Delta. Wie wirkt Regen auf unser Gemüt? Construction, irrigation, and land alteration have impacted delta formation. Dafür gibt es gleich mehrere Systeme, die gewünschten Objekte ins Visier zu nehmen. Nicola Sekler, Tübingen [NSe] 250. At its widest, the delta is about 153 mi (250 km) wide along the Mediterranean. Martin Pöhler, Tübingen [MaP] This suspended load is deposited by, The foreset beds in turn are deposited in inclined layers over the bottomset beds as the active lobe advances. As soon as a river's speed decreases, it loses the ability to carry all of its load and a portion will be deposited, depending on how much the river slows down. There are many delta types, but the three ‘classics’ are: Arcuate Prof. Dr. Jürgen Deiters, Osnabrück [JD] Image in Margaritifer Sinus quadrangle. Prof. Dr. Arno Kleber, Bayreuth [AK] Farid El Kholi, Berlin [FE] Dinge am Himmel zu finden, ist manchmal nicht ganz einfach. Example: Hudson estuary. Dipl.-Geogr.  A good example of the result of this process is the Wax Lake Delta.  Active margin river deltas tend to be much smaller and less abundant but may transport similar amounts of sediment. Peter Neumann, Münster [PN] The Nile Delta is an example of an arcuate delta. The delta arms sometimes remain blocked with ice the whole year round. Geological Association of Canada, Hamilton, Ontario. Dr. Jörg Janzen, Berlin [JJa] The name was derived from Grove Karl Gilbert. Prof. Dr. Hubert Job, München [HJo]  However, the sediment is never piled up in thick sequences due to the sediment traveling and depositing in deep subduction trenches. Dr. Andreas Megerle, Tübingen [AM] , Erosion is also an important control in tide-dominated deltas, such as the Ganges Delta, which may be mainly submarine, with prominent sandbars and ridges. Prof. Dr. Jens Meincke, Hamburg [JM] Dipl.-Geogr. Beds in a hypocynal delta dip at a very shallow angle, around 1 degree. Shelf-Margin Deltas. Prof. Dr. Karl-Friedrich Schreiber, Münster [KFS] 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 are found at the mouth of large rivers - for example, the Mississippi. Prof. Dr. Wilhelm Steingrube, Greifswald [WSt]  Drowned coastal river valleys that were inundated by rising sea levels during the late Pleistocene and subsequent Holocene tend to have dendritic estuaries with many feeder tributaries. Eine zunehmende Sedimentbelastung der Flüsse infolge Rodung des Hinterlandes und Ausbreitung der Landwirtschaft vermag diesen Faktor jedoch oft überzukompensieren. [RG] Each tributary mimics this salinity gradient from their brackish junction with the mainstem estuary up to the fresh stream feeding the head of tidal propagation. Prof. Dr. Werner Mikus, Heidelberg [WM]  The size, geometry, and location of the receiving basin also plays an important role in delta evolution. A river delta is a landform created by deposition of sediment that is carried by a river as the flow leaves its mouth and enters slower-moving or stagnant water. Geomorphology and Sedimentology of Estuaries. The more often the flow changes course, the shape develops as closer to an ideal fan, because more rapid changes in channel position result in more uniform deposition of sediment on the delta front. 3) Birds foot Delta: Deposited material divides the river into smaller distributaries. Maren Ott, Frankfurt a.M. [MO] ta (dĕl′tə) An area of the south-central United States extending on either side of the Mississippi River from Memphis, Tennessee, to Vicksburg, Mississippi. Below are pictures of a few.. Wenn Sie inhaltliche Anmerkungen zu diesem Artikel haben, können Sie die Redaktion per E-Mail informieren. Prof. Dr. Georg Miehe, Marburg [GM] Slingerland, R. and N. D. Smith (1998), "Necessary conditions for a meandering-river avulsion,". Ebro), c) Fingerdelta (Bsp. Dr. Harald Leisch, Köln [HL] Sven Henschel, Berlin [SH] Dipl.-Geogr. By Thomas C. Chidsey, Thomas C. Chidsey, Jr (ed), Utah Geological Survey, 2002. Prof. Dr. Dietbert Thannheiser, Hamburg [DT] Dr. Volker Wrede, Krefeld [VW], Grafik: Delta: Delta: Deltatypen. Dr. Peter Schnell, Münster [PSch] Prof. Dr. Hans-Jürgen Klink, Bochum [HJK] Dipl.-Geogr. Dr. Karin Jehn, Karlsruhe [KJ] As the gradient of the river channel decreases, the amount of shear stress on the bed decreases, which results in the deposition of sediment within the channel and a rise in the channel bed relative to the floodplain. The rivers and creeks of the Sacramento and San Joaquin distributary networks meet in Suisun Bay, before flowing to the Pacific Ocean through a single gap in the Coast Range, the Carquinez Strait. PD Dr. Barbara Sponholz, Würzburg [BS]  They are also ecologically important, with different species' assemblages depending on their landscape position. Researchers have found a number of examples of deltas that formed in Martian lakes. Dr. Ingrid Stengel, Würzburg [IS] 2005.  When sediment does not travel far from the source, sediments that build up are coarser grained and more loosely consolidated, therefore making delta formation more difficult. Dr. Jürgen Ehlers, Hamburg [JE] Dipl.-Geogr. PD Dr. Eckhard Jedicke, Bad Arolsen [EJ] River deltas are important in human civilization, as they are major agricultural production centers and population centers. It is made up of deposits of soil which are formed after rivers and waters are emptied to the lake or sea. The generic term mega delta can be used to describe very large Asian river deltas, such as the Yangtze, Pearl, Red, Mekong, Irrawaddy, Ganges-Brahmaputra, and Indus. The latter characteristic distinguishes a marsh from a swamp, whose plant life is dominated by trees. Mississippi), d) Bogendelta (Bsp. Prof. Dr. Otto Richter, Braunschweig [OR] Warum war der letzte Winter so warm - oder kalt? an area of low, flat land, sometimes shaped like a triangle, where a river divides into several smaller rivers before flowing into the ocean: the Mississippi delta. Dr. Heinz Sander, Köln [HS] Dipl.-Geogr. Prof. Dr. Paul Gans, Mannheim [PG] Prof. Dr. Heiner Dürr, Bochum [HD] Sie können unsere Newsletter jederzeit wieder abbestellen. Prof. Dr. Martin Seger, Klagenfurt [MS] Dipl.-Geogr. Dr. Hubert Höfer, Karlsruhe [HH] Prof. Dr. Thomas Mosimann, Hannover [TM] Dorothee Bürkle, Köln [DBü] Prof. Dr. Hans Böhm, Bonn [HB] Prof. Dr. Christoph Kottmeier, Karlsruhe [CK] Dr. Klaus Kremling, Kiel [KKr] The most fertile soil is the alluvium of the' Delta, deposited during the overflows of the Mississippi. Dr. Arnold Scheuerbrandt, Heidelberg [AS] Dr. Klaus Sachs, Heidelberg [KS] Prof. Dr. Klaus Wolf, Frankfurt a.M. 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