The most fertile soil is the alluvium of the' Delta, deposited during the overflows of the Mississippi. An important cotton-producing region, it is noted for its folk culture, especially as the home of some of the earliest blues music. Prof. Dr. Bärbel Leupolt, Hamburg [BL] Dr. Harald Leisch, Köln [HL] Prof. Dr. Hubert Job, München [HJo] Dipl.-Geogr. [26][27], 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. [15] However, the sediment is never piled up in thick sequences due to the sediment traveling and depositing in deep subduction trenches. Prof. Dr. Wolfgang Haber, München [WHa] In (eds. For example, a mountain river depositing sediment into a freshwater lake would form this kind of delta. Other rivers, particularly those on coasts with significant tidal range, do not form a delta but enter into the sea in the form of an estuary. Dr. Klaus Dodds, London [KD] Prof. Dr. Carl Beierkuhnlein, Rostock [CBe] [16] Active margin river deltas tend to be much smaller and less abundant but may transport similar amounts of sediment. Prof. Dr. Manfred Meurer (Physische Geographie) [13], A Gilbert delta (named after Grove Karl Gilbert) is a type of fluvial-dominated[22] delta formed from coarse sediments, as opposed to gently-sloping muddy deltas such as that of the Mississippi. Dr. Martina Fromhold-Eisebith, Seibersdorf [MFE] Human impacts of deltas Positive impacts • Deltas provide fertile land and are associated with good fishing grounds offshore, and with oil and gas deposits beneath the surface. Sind Wellenenergie, Tidenhub oder Strömungen zu stark, können Deltas auch gekappt werden und sind dann in einer geraden Küstenlinie zurückgeschnitten. Sometimes a river divides into multiple branches in an inland area, only to rejoin and continue to the sea. 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Because the sediment is laid down in this fashion, the shape of these deltas approximates a fan. [44] Making deltas a common location for civilizations to flourish due to access to flat land for farming, freshwater for sanitation and irrigation, and sea access for trade. "Geological and Petrophysical Characterization of the Ferron Sandstone for 3-D Simulation of a Fluvial-deltaic Reservoir". Wenn Sie inhaltliche Anmerkungen zu diesem Artikel haben, können Sie die Redaktion per E-Mail informieren. Dr. Franz Köhler, Gotha [FK] 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. River deltas form when a river carrying sediment reaches either (1) a body of 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. 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