|
Proglacial Lake
In geology, a proglacial lake is a lake formed either by the damming action of a moraine during the retreat of a melting glacier, a glacial ice dam, or by meltwater trapped against an ice sheet due to isostatic depression of the crust around the ice. At the end of the last ice age about 10,000 years ago, large proglacial lakes were a widespread feature in the northern hemisphere. Moraine-dammed The receding glaciers of the tropical Andes have formed a number of proglacial lakes, especially in the Cordillera Blanca of Peru, where 70% of all tropical glaciers are. Several such lakes have formed rapidly during the 20th century. These lakes may burst, creating a hazard for zones below. Many natural dams (usually moraines) containing the lake water have been reinforced with safety dams. Some 34 such dams have been built in the Cordillera Blanca to contain proglacial lakes. Several proglacial lakes have also formed in recent decades at the end of glaciers on the eastern side ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lago Viedma 1997
__NOTOC__ Lago, which means "lake" in several languages, may refer to: Places *Lago, Calabria, a ''comune'' in the Province of Cosenza, Italy *Lago, Mexico, a municipality zone in the State of Mexico *Lago District, a ''distrito'' in Niassa Province, Mozambique *Lago, Portugal, a ''freguesia'' in the District of Braga *Lago, Asturias, a ''parroquia'' in the ''municipio'' of Allande, Spain *Lago, Texas, a census-designated place People *Anders Lago (born 1956), Swedish politician *Ângela Lago (1945–2017), Brazilian children's writer and illustrator *Antonio Lago (1893–1960), Venice-born French motor vehicle manufacturer *Enrique Lago, Chilean Anglican bishop *Fábio Lago (born 1970), Brazilian actor *Mario Lago (1878–1950), Italian statesman and diplomat *Mário Lago (1911–2002), Brazilian lawyer, poet, broadcaster, composer and actor *Nais Lago (born 1914), Italian actress *Virginia Lago (born 1946), Argentine actress Other uses *Lago (Madrid Metro), a statio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glacial Motion
Glacial motion is the motion of glaciers, which can be likened to rivers of ice. It has played an important role in sculpting many landscapes. Most lakes in the world occupy basins scoured out by glaciers. Glacial motion can be fast (up to , observed on Jakobshavn Isbræ in Greenland) or slow ( on small glaciers or in the center of ice sheets), but is typically around . Processes of motion Glacier motion occurs from four processes, all driven by gravity: basal sliding, glacial quakes generating fractional movements of large sections of ice, bed deformation, and internal deformation. * In the case of basal sliding, the entire glacier slides over its bed. This type of motion is enhanced if the bed is soft sediment, if the glacier bed is thawed and if meltwater is prevalent. * Bed deformation is thus usually limited to areas of sliding. Seasonal melt ponding and penetrating under glaciers shows seasonal acceleration and deceleration of ice flows affecting whole icesheets. * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glacial Lake Missoula
Lake Missoula was a prehistoric proglacial lake in western Montana that existed periodically at the end of the last ice age between 15,000 and 13,000 years ago. The lake measured about and contained about of water, half the volume of Lake Michigan. The ''Glacial Lake Missoula National Natural Landmark'' is located about 110 kilometers (68 mi) northwest of Missoula, Montana, at the north end of the Camas Prairie Valley, just east of Montana Highway 382 and Macfarlane Ranch. It was designated as a National Natural Landmark in 1966 because it contains the great ripples (often measuring high and long) that served as a strong supporting element for J Harlen Bretz's contention that Washington State's Channeled Scablands were formed by repeated cataclysmic floods over only about 2,000 years, rather than through the millions of years of erosion that had been previously assumed. The lake was the result of an ice dam on the Clark Fork caused by the southern encroachment of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clark Fork River
The Clark Fork, or the Clark Fork of the Columbia River, is a river in the U.S. states of Montana and Idaho, approximately long. It is named after William Clark of the 1806 Lewis and Clark Expedition. The largest river by volume in Montana, it drains an extensive region of the Rocky Mountains in western Montana and northern Idaho in the watershed of the Columbia River. The river flows northwest through a long valley at the base of the Cabinet Mountains and empties into Lake Pend Oreille in the Idaho Panhandle. The Pend Oreille River in Idaho, Washington, and British Columbia, Canada which drains the lake to the Columbia in Washington, is sometimes included as part of the Clark Fork, giving it a total length of , with a drainage area of . In its upper in Montana near Butte, it is known as Silver Bow Creek. Interstate 90 follows much of the upper course of the river from Butte to Saint Regis. The highest point within the river's watershed is Mount Evans at in Deer Lodge Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Idaho Panhandle
The Idaho panhandle—locally known as North Idaho, Northern Idaho, or simply the Panhandle—is a salient region of the U.S. state of Idaho encompassing the state's 10 northernmost counties: Benewah, Bonner, Boundary, Clearwater, Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone (though the southern part of the region is sometimes referred to as North Central Idaho). The panhandle is bordered by the state of Washington to the west, Montana to the east, and the Canadian province of British Columbia to the north. The Idaho panhandle, along with Eastern Washington, makes up the region known as the Inland Northwest, headed by its largest city, Spokane, Washington. Coeur d'Alene is the largest city within the Idaho panhandle. Spokane is around west of Coeur d'Alene, and its Spokane International Airport is the region's main air hub. Other important cities in the region include Lewiston, Moscow, Post Falls, Hayden, Sandpoint, and the smaller towns of St ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lago Argentino
Lago Argentino is a lake in the Patagonian province of Santa Cruz, Argentina, at . It is the largest freshwater lake in Argentina, with a surface area of and a maximum width of . The lake's waters have an average depth of , with a maximum depth of . The deepest point of the lake is situated in the end of its narrow north-northwestern arm, in front of the retreating Upsala Glacier. This depth was discovered during a survey in 2001. The south-southwestern arm ends in front of the Perito Moreno Glacier. The glaciers debouche into the lake at these sites, making "trenches" in the bedrock. The lake reaches an astonishing below mean sea level. Lago Argentino lies within Los Glaciares National Park in a landscape accented by numerous glaciers, and the lakes of the area are fed by the glacial meltwater of several rivers. For example, the waters of Lake Viedma are fed by the La Leona River, and many other smaller mountain streams. Lago Argentino's drainage basin amounts to more tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Patagonia
Patagonia () is a geographical region that includes parts of Argentina and Chile at the southern end of South America. The region includes the southern section of the Andes mountain chain with lakes, fjords, temperate rainforests, and glaciers in the west and Patagonian Desert, deserts, Plateaus, tablelands, and steppes to the east. Patagonia is bounded by the Pacific Ocean on the west, the Atlantic Ocean to the east, and many bodies of water that connect them, such as the Strait of Magellan, the Beagle Channel, and the Drake Passage to the south. The northern limit of the region is not precisely defined; the Colorado River, Argentina, Colorado and Barrancas River, Barrancas rivers, which run from the Andes to the Atlantic, are commonly considered the northern limit of Argentine Patagonia. The archipelago of Tierra del Fuego is sometimes considered part of Patagonia. Most geographers and historians locate the northern limit of Chilean Patagonia at Huincul Fault, in Araucanía R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perito Moreno Glacier
The Perito Moreno (), Francisco Gormaz or Bismarck Glacier is a glacier located in Los Glaciares National Park in southwest Santa Cruz Province, Argentina, and originated in the Magallanes Region in Chile, being also part of the Bernardo O'Higgins National Park. It is one of the most important tourist attractions in the Argentine Patagonia. The ice formation, in length, is one of 48 glaciers fed by the Southern Patagonian Ice Field located in the Andes system shared with Chile which has a small part of the origins of the glacier. This ice field is the world's third largest reserve of fresh water. The Perito Moreno Glacier, located from El Calafate, was named after the explorer Francisco Moreno, a pioneer who studied the region in the 19th century and played a major role in defending the Argentinian thesis in the 1902 Arbitral award of the Andes between Argentina and Chile. Status Since 2020 the glacier has been retreating on its northern front, possibly due to clim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Russell Fjord
Russell Fiord, also spelled Russell Fjord, is a fjord in the U.S. state of Alaska. It extends north to Disenchantment Bay, the terminus of Hubbard Glacier, at the head of Yakutat Bay. The fjord was named in 1901 by Marcus Baker of the U.S. Geological Survey for explorer Israel Russell, who discovered the estuary in 1891 while exploring the Yakutat region. The opening into Disenchantment Bay has been periodically blocked by Hubbard Glacier, turning Russell Fiord into a lake collecting freshwater run-off from the glacier. The entrance closed from May to October 1986, and again briefly in 2002. Russell Fiord Wilderness The Russell Fiord Wilderness is a wilderness area within the Tongass National Forest, protecting surrounding the fjord. The wilderness was established by the Alaska National Interest Lands Conservation Act in 1980 and is managed by the U.S. Forest Service The United States Forest Service (USFS) is an agency within the U.S. Department of Agriculture. It admin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hubbard Glacier
__NOTOC__ Hubbard Glacier ( Lingít: ''Sít' Tlein'') is a glacier located in Wrangell–St. Elias National Park and Preserve in eastern Alaska and Kluane National Park and Reserve in Yukon, Canada, and named after Gardiner Hubbard. Geography The longest source for Hubbard Glacier originates from its snout and is located at about , approximately west of Mount Walsh with an elevation around . A shorter tributary glacier begins at the easternmost summit on the Mount Logan ridge at about at about . Before it reaches the sea, Hubbard is joined by the Valerie Glacier to the west, which, through forward surges of its own ice, has contributed to the advance of the ice flow that experts believe will eventually dam the Russell Fjord from Disenchantment Bay waters. The Hubbard Glacier ice margin has continued to advance for about a century. In May 1986, the Hubbard Glacier surged forward, blocking the outlet of Russell Fjord and creating Russell Lake. All that summer, the n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Agassiz
Lake Agassiz ( ) was a large proglacial lake that existed in central North America during the late Pleistocene, fed by meltwater from the retreating Laurentide Ice Sheet at the end of the last glacial period. At its peak, the lake's area was larger than all of the modern Great Lakes combined. It eventually drained into what is now Hudson Bay, leaving behind Lake Winnipeg, Lake Winnipegosis, Lake Manitoba, and Lake of the Woods. First postulated in 1823 by William H. Keating, it was named by Warren Upham in 1879 after Louis Agassiz, the then recently deceased (1873) founder of glaciology, when Upham recognized that the lake was formed by glacial action. Geological progression During the last glacial maximum, northern North America was covered by an ice sheet, which alternately advanced and retreated with variations in the climate. This continental ice sheet formed during the period now known as the Wisconsin glaciation, and covered much of central North America betw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
