|
Proglacial Lakes
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 of Ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lago Viedma 1997
__NOTOC__ Lago, which means "lake" in Italian, Portuguese, Spanish and Galician, 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 *Lagos, Nigeria, the largest city in Nigeria People *Anders Lago, Swedish politician *Ângela Lago (1945–2017), Brazilian children's writer and illustrator *Antonio Lago, Venice-born French motor vehicle manufacturer *Fábio Lago, Brazilian actor *Nais Lago, Italian actress *Virginia Lago (born 1946), Argentine actress Other uses *Lago (Madrid Metro), a station on Line 5 *Talbot-Lago, a type of car *''Lago'', a fictional western town depicted in the film, ''High Plains Drifter'' See also * Lagos (other) Lagos is the l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valley
A valley is an elongated low area often running between Hill, hills or Mountain, mountains, which will typically contain a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over a very long period. Some valleys are formed through erosion by glacier, glacial ice. These glaciers may remain present in valleys in high mountains or polar areas. At lower latitudes and altitudes, these glaciation, glacially formed valleys may have been created or enlarged during ice ages but now are ice-free and occupied by streams or rivers. In desert areas, valleys may be entirely dry or carry a watercourse only rarely. In karst, areas of limestone bedrock, dry valleys may also result from drainage now taking place cave, underground rather than at the surface. Rift valleys arise principally from tectonics, earth movements, rather than erosion. Many different types of valleys are described by geographers, using terms th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Missoula Floods
The Missoula floods (also known as the Spokane floods or the Bretz floods or Bretz's floods) were cataclysmic glacial lake outburst floods that swept periodically across eastern Washington and down the Columbia River Gorge at the end of the last ice age. These floods were the result of periodic sudden ruptures of the ice dam on the Clark Fork River that created Glacial Lake Missoula. After each ice dam rupture, the waters of the lake would rush down the Clark Fork and the Columbia River, flooding much of eastern Washington and the Willamette Valley in western Oregon. After the lake drained, the ice would reform, creating Glacial Lake Missoula again. These floods have been researched since the 1920s. During the last deglaciation that followed the end of the Last Glacial Maximum, geologists estimate that a cycle of flooding and reformation of the lake lasted an average of 55 years and that the floods occurred several times over the 2,000-year period between 15,000 and 13,000 year ... [...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 kilometres (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 a f ... [...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. 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 County, Montana along the Continental Divide. The Clark Fork is a Class I rive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Idaho Panhandle
The Idaho Panhandle—locally known as North Idaho—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. Maries and Bonners Ferry. East of Coeur d'Alene is th ... [...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 biggest freshwater lake in Argentina, with a surface area of (maximum width: ). It has an average depth of , and a maximum depth of . The lake lies within the Los Glaciares National Park in a landscape with numerous glaciers and is fed by the glacial meltwater of several rivers, the water from Lake Viedma brought by the La Leona River, and many mountain streams. Its drainage basin amounts to more than . Waters from Lake Argentino flow into the Atlantic Ocean through the Santa Cruz River. The glaciers, the nearby town of El Calafate and the lake itself are important tourist destinations. The lake in particular is appreciated for fishing. Perch, common galaxias ("puyen grande"), lake trout and rainbow trout — in both anadromous and Potamodromous forms — are all found. ''Lago Argentino'' was also the name of the airport that served the area until 2000. This airport is currently closed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Patagonia
Patagonia () refers to a geographical region that encompasses the southern end of South America, governed by Argentina and Chile. The region comprises the southern section of the Andes Mountains with lakes, fjords, temperate rainforests, and glaciers in the west and deserts, 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 Colorado and 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 included as part of Patagonia. Most geographers and historians locate the northern limit of Chilean Patagonia at Huincul Fault, in Araucanía Region.Manuel Enrique Schilling; Richard WalterCarlson; AndrésTassara; Rommulo Vieira Conceição; Gustavo Walter Bertotto; ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perito Moreno Glacier
The Perito Moreno Glacier () is a glacier located in Los Glaciares National Park in southwest Santa Cruz Province, Argentina. 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. 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 territory of Argentina in the conflict surrounding the international border dispute with Chile. Status Despite most of the innumerable glaciers worldwide retreating, one of the few unusual glaciers that maintains in a state of equilibrium is the Perito Moreno Glacier because it continues to accumulate mass at a rate similar to that of its loss. The reason remains debated by glac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Russell Fjord
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 was periodically blocked by the glacier and the Russell Fjord turned into a lake collecting freshwater run-off from the glacier. The entrance closed from May to October 1986, and again briefly in 200 Russell Fjord Wilderness The Russell Fjord Wilderness is a National Wilderness Preservation System, 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 of the U.S. Department of Agriculture that ... [...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 new lake ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
