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Spillway Icefall
Spillway Icefall () is an icefall descending northward through central Duncan Mountains to Amundsen Coast on the coast of Antarctica. The icefall cascades through the mountains giving the appearance of a turbulent spillway on a dam. The descriptive name was approved by Advisory Committee on Antarctic Names (US-ACAN) from a proposal by Edmund Stump, geologist, Arizona State University Arizona State University (Arizona State or ASU) is a public research university in the Phoenix metropolitan area. Founded in 1885 by the 13th Arizona Territorial Legislature, ASU is one of the largest public universities by enrollment in the ..., who worked in this area, 1974–75. Icefalls of the Ross Dependency Amundsen Coast {{RossDependency-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Icefall
An icefall is a portion of certain glaciers characterized by relatively rapid flow and chaotic crevassed surface, caused in part by gravity. The term ''icefall'' is formed by analogy with the word ''waterfall'', which is a similar phenomenon of the liquid phase but at a more spectacular speed. When ice movement of a glacier is faster than elsewhere, because the glacier bed steepens or narrows, and the flow cannot be accommodated by plastic deformation, the ice fractures, forming crevasses. Where two fractures meet, seracs (or ice towers) can be formed. When the movement of the ice slows down, the crevasses can coalesce, resulting in the surface of the glacier becoming smoother. Ice flow Perhaps the most conspicuous consequence of glacier flow, icefalls occur where the glacier bed steepens and/or narrows. Most glacier ice flows at speeds of a few hundred metres per year or less. However, the flow of ice in an icefall may be measured in kilometres per year. Such rapid flow cannot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Duncan Mountains
The Duncan Mountains () are a group of rugged coastal foothills, about long, extending from the mouth of Liv Glacier to the mouth of Strom Glacier at the head of the Ross Ice Shelf in Antarctica. They were discovered by the Byrd Antarctic Expedition in November 1929 and named for James Duncan, the Manager of Tapley Ltd, shipping agents for the Byrd expeditions at Dunedin, New Zealand. Features Wishbone Ridge Wishbone Ridge () is a Y-shaped ridge trending northeast from the main ridge of the Duncan Mountains. It is located between the Campbell and the Priestley glaciers and has granite outcrops. The feature is 2 nautical miles (3.7 km) east of Morris Peak and is unique among the series of ridges in the Duncan Mountains in that it bifurcates, giving an aerial view similar in shape to a "wishbone." The descriptive name was suggested by Edmund Stump of the United States Antarctic Research Program (USARP) Ohio State University The Ohio State University, commonl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amundsen Coast
Amundsen Coast is that portion of the coast to the south of the Ross Ice Shelf lying between Morris Peak, on the east side of Liv Glacier, and the west side of the Scott Glacier. Named by New Zealand Antarctic Place-Names Committee in 1961 for Captain Roald Amundsen, the Norwegian explorer who led his own expedition in 1910–12 to the Antarctic. Setting up a base at Framheim at the edge of the Ross Ice Shelf, he sledged southward across the shelf and discovered a route up the Axel Heiberg Glacier along this coast to reach the polar plateau. He was the first to reach the South Pole The South Pole, also known as the Geographic South Pole, Terrestrial South Pole or 90th Parallel South, is one of the two points where Earth's axis of rotation intersects its surface. It is the southernmost point on Earth and lies antipod ..., December 14, 1911. References * Coasts of the Ross Dependency {{RossDependency-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antarctica
Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean, it contains the geographic South Pole. Antarctica is the fifth-largest continent, being about 40% larger than Europe, and has an area of . Most of Antarctica is covered by the Antarctic ice sheet, with an average thickness of . Antarctica is, on average, the coldest, driest, and windiest of the continents, and it has the highest average elevation. It is mainly a polar desert, with annual precipitation of over along the coast and far less inland. About 70% of the world's freshwater reserves are frozen in Antarctica, which, if melted, would raise global sea levels by almost . Antarctica holds the record for the lowest measured temperature on Earth, . The coastal regions can reach temperatures over in summer. Native species of animals include mites, nematodes, penguins, seals and tardigrades. Where vegetation o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spillway
A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure that water does not damage parts of the structure not designed to convey water. Spillways can include floodgates and fuse plugs to regulate water flow and reservoir level. Such features enable a spillway to regulate downstream flow—by releasing water in a controlled manner before the reservoir is full, operators can prevent an unacceptably large release later. Other uses of the term "spillway" include bypasses of dams and outlets of channels used during high water, and outlet channels carved through natural dams such as moraines. Water normally flows over a spillway only during flood periods, when the reservoir has reached its capacity and water continues entering faster than it can be released. In contrast, an intake tower is a structure ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Advisory Committee On Antarctic Names
The Advisory Committee on Antarctic Names (ACAN or US-ACAN) is an advisory committee of the United States Board on Geographic Names responsible for recommending commemorative names for features in Antarctica. History The committee was established in 1943 as the Special Committee on Antarctic Names (SCAN). It became the Advisory Committee on Antarctic Names in 1947. Fred G. Alberts was Secretary of the Committee from 1949 to 1980. By 1959, a structured nomenclature was reached, allowing for further exploration, structured mapping of the region and a unique naming system. A 1990 ACAN gazeeter of Antarctica listed 16,000 names. Description The United States does not recognise territorial boundaries within Antarctica, so ACAN assigns names to features anywhere within the continent, in consultation with other national nomenclature bodies where appropriate, as defined by the Antarctic Treaty System. The research and staff support for the ACAN is provided by the United States Geologi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edmund Stump
Edmund is a masculine given name or surname in the English language. The name is derived from the Old English elements ''ēad'', meaning "prosperity" or "riches", and ''mund'', meaning "protector". Persons named Edmund include: People Kings and nobles *Edmund the Martyr (died 869 or 870), king of East Anglia *Edmund I (922–946), King of England from 939 to 946 *Edmund Ironside (989–1016), also known as Edmund II, King of England in 1016 *Edmund of Scotland (after 1070 – after 1097) *Edmund Crouchback (1245–1296), son of King Henry III of England and claimant to the Sicilian throne *Edmund, 2nd Earl of Cornwall (1249–1300), earl of Cornwall; English nobleman of royal descent *Edmund of Langley, 1st Duke of York (1341–1402), son of King Edward III of England * Edmund Tudor, earl of Richmond (1430–1456), English and Welsh nobleman *Edmund, Prince of Schwarzenberg (1803–1873), the last created Austrian field marshal of the 19th century In religion * Saint Edmund (dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arizona State University
Arizona State University (Arizona State or ASU) is a public research university in the Phoenix metropolitan area. Founded in 1885 by the 13th Arizona Territorial Legislature, ASU is one of the largest public universities by enrollment in the U.S. One of three universities governed by the Arizona Board of Regents, ASU is a member of the Universities Research Association and classified among "R1: Doctoral Universities – Very High Research Activity". ASU has nearly 150,000 students attending classes, with more than 38,000 students attending online, and 90,000 undergraduates and nearly 20,000 postgraduates across its five campuses and four regional learning centers throughout Arizona. ASU offers 350 degree options from its 17 colleges and more than 170 cross-discipline centers and institutes for undergraduates students, as well as more than 400 graduate degree and certificate programs. The Arizona State Sun Devils compete in 26 varsity-level sports in the NCAA Division I Pac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
