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Alluvial Fan |
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alluvial fan [ə′lüv·ē·əl ′fan]
(geology) A fan-shaped deposit formed by a stream either where it issues from a narrow moutain valley onto a plain or broad valley, or where a tributary stream joins a main stream. Alluvial Fan a type of relief in the form of a slightly convex fan, formed through the accumulation of loose detrital material in the estuarine part of temporary streams and small rivers where they emerge from mountains onto piedmont plains or from gorges onto broader valleys. It forms as the result of the deposition of material suspended in water when the speed of the current of water decreases owing to a change in gradient. Populated areas are frequently situated on alluvial fans. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | The gully system shows four intervals where water-borne sediments were carried down the steep slopes of nearby alcoves and deposited in alluvial fans," said Samuel Schon, a Brown graduate student and the paper's lead author. 06 10:30 "DELTA"-BLUFF MARGIN ALLUVIAL FANS James Starnes Mississippi Office of Geology Lateral migration of the Mississippi River into the river's east valley wall creates an escarpment of Peorian loess, Early Pleistocene Pre-loess terrace deposits (coarse sand and gravels of the ancestral Mississippi River), and underlying Tertiary formations (which commonly form the toe of the escarpment). 00 Hardcover Special publications; 251 GB591 Two research groups of the Geological Society of London claim that they chose Sorbas, in southeastern Spain as the cite for 2003 a conference on alluvial fans because it is a tectonically active dry region with a wide range of Quaternary alluvial fans. |
Alluvial fans |
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