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Landslide Dam
A landslide dam or barrier lake is the natural damming of a river by some kind of landslide, such as a debris flow, rock avalanche or volcanic eruption. If the damming landslide is caused by an earthquake, it may also be called a quake lake. Some landslide dams are as high as the largest existing artificial dam.Robert B. Jansen (1988) "Advanced Dam Engineering for Design, Construction, and Rehabilitation", Causes The major causes for landslide dams investigated by 1986 are landslides from excessive precipitation and earthquakes, which account for 84%. Volcanic eruptions account for a further 7% of dams. Other causes of landslides account for the remaining 9%. Consequences The water impounded by a landslide dam may create a dam reservoir (lake) that may last for a short time, to several thousand years. Because of their rather loose nature and absence of controlled spillway, landslide dams frequently fail catastrophically and lead to downstream flooding, often with high casualti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
River
A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as Stream#Creek, creek, Stream#Brook, brook, rivulet, and rill. There are no official definitions for the generic term river as applied to Geographical feature, geographic features, although in some countries or communities a stream is defined by its size. Many names for small rivers are specific to geographic location; examples are "run" in some parts of the United States, "Burn (landform), burn" in Scotland and northeast England, and "beck" in northern England. Sometimes a river is defined as being larger than a creek, but not always: the language is vague. Rivers are part of the water cycle. Water generally collects in a river from Precipitation (meteorology), precipitation through a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Falling River Level Causing Landslide 1
Falling or fallin' may refer to: *Falling (physics), movement due to gravity *Falling (accident) *Falling (execution) *Falling (sensation) People *Christine Falling (born 1963), American serial killer who murdered six children Books * ''Falling'' (Provoost novel), a 1994 novel by Anne Provoost * ''Falling'' (Howard novel), a 1999 novel by Elizabeth Jane Howard *"Falling", a 1967 poem by James Dickey Film and television * ''Falling'' (2008 film), a film by Richard Dutcher * ''Falling'' (2015 film), starring Adesua Etomi and Blossom Chukwujekwu * ''Falling'' (2020 film), an American-British-Canadian drama film * ''The Falling'' (1987 film), an American film by Deran Sarafian * ''The Falling'' (2014 film), a British film by Carol Morley *''Falling'' (Dutch: ''Vallen''), a 2001 film by Hans Herbots based on the novel by Anne Provoost *''Falling'', a 2005 ITV adaptation of the novel by Elizabeth Jane Howard *"Falling", an episode of the Adult Swim television series ''Off the Air' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Zealand
New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island country by area, covering . New Zealand is about east of Australia across the Tasman Sea and south of the islands of New Caledonia, Fiji, and Tonga. The country's varied topography and sharp mountain peaks, including the Southern Alps, owe much to tectonic uplift and volcanic eruptions. New Zealand's capital city is Wellington, and its most populous city is Auckland. The islands of New Zealand were the last large habitable land to be settled by humans. Between about 1280 and 1350, Polynesians began to settle in the islands and then developed a distinctive Māori culture. In 1642, the Dutch explorer Abel Tasman became the first European to sight and record New Zealand. In 1840, representatives of the United Kingdom and Māori chiefs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Waikaremoana
Lake Waikaremoana is located in Te Urewera in the North Island of New Zealand, 60 kilometres northwest of Wairoa and 80 kilometres west-southwest of Gisborne. It covers an area of . From the Maori Waikaremoana translates as 'sea of rippling waters'. The lake lies in the heart of Tuhoe country. The hamlet of Aniwaniwa and the Waikaremoana Holiday Park are located on the lakeshore, along SH38 (from Wai-O-Tapu via Murupara to Wairoa), which connects the lake to the central North Island (Rotorua) and Gisborne. There is a Department of Conservation office at Aniwaniwa. Several walks start here, including a short stroll to Aniwaniwa Falls. The village of Onepoto is located on the lake's southern shores, close to the lake's old overflow channel and the intake of the Waikaremoana hydroelectric power scheme. The name Onepoto means short beach , and refers to the small bay to the north of the village with a beach only 60 metres long.Wises New Zealand Guide, 7th edition 1979 Lake Wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sarez Lake
Sarez Lake (russian: Сарезское озеро; tg, Сарез кӯл, Sarez Kūl) is a lake in Rushon District of Gorno-Badakhshan province, Tajikistan. Length about , depth few hundred meters, water surface elevation about above sea level and volume of water is more than . The mountains around rise more than above the lake level. The lake formed in 1911, after a great earthquake, when the Murghab River (Tajikistan), Murghab River was blocked by a big landslide. Scientists believe that the landslide dam formed by the earthquake, known as the Usoi Dam, is unstable given local seismicity, and that the terrain below the lake is in danger of catastrophic flood if the dam were to fail during a future earthquake. The Usoi Dam wall survived a localised 7.2 magnitude earthquake, the 2015 Tajikistan earthquake, on the 7th December 2015 with no visible signs of deterioration. Shadau Lake is a small water body southwest of the Usoi Dam and west of Sarez Lake. Formation The format ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Murghab River (Tajikistan)
The Bartang (Russian and Tajik: Бартанг) is a river of Central Asia, tributary to the Panj and consequently to the Amu Darya. In its upper reaches, it is also known as the Murghab and Aksu; it flows through the Wakhan in Afghanistan, then through the Rushon District of the Gorno-Badakhshan autonomous region, Tajikistan. The river is long (133 km excluding Aksu and Murghab) and has a basin area of .Бартанг Course The river rises in Chaqmaqtin Lake in the |
Tajikistan
Tajikistan (, ; tg, Тоҷикистон, Tojikiston; russian: Таджикистан, Tadzhikistan), officially the Republic of Tajikistan ( tg, Ҷумҳурии Тоҷикистон, Jumhurii Tojikiston), is a landlocked country in Central Asia. It has an area of and an estimated population of 9,749,625 people. Its capital and largest city is Dushanbe. It is bordered by Afghanistan to the south, Uzbekistan to the west, Kyrgyzstan to the north, and China to the east. It is separated narrowly from Pakistan by Afghanistan's Wakhan Corridor. The traditional homelands of the Tajiks include present-day Tajikistan as well as parts of Afghanistan and Uzbekistan. The territory that now constitutes Tajikistan was previously home to several ancient cultures, including the city of Sarazm of the Neolithic and the Bronze Age and was later home to kingdoms ruled by people of different faiths and cultures, including the Oxus civilization, Andronovo culture, Buddhism, Nestorian Ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Usoi Dam
The Usoi Dam is a natural landslide dam along the Murghab River (Tajikistan), Murghab River in Tajikistan. At high, it is the tallest dam in the world, either natural or man-made. The dam was created on February 18, 1911, when the 7.4-Surface wave magnitude, Ms 1911 Sarez earthquake, Sarez earthquake caused a massive landslide that blocked the flow of the river. The dam is formed of approximately of rock dislodged from the steeply sloped river valley of the Murghab River, Murghab, which cuts from east to west through the high and rough Pamir Mountains. It is named after the village of Usoi, which was completely buried by the 1911 landslide. The dam rises to a height of from the original valley floor. The basin formed by Usoi Dam now holds Sarez Lake, a -long lake holding of water. Water does not flow over the top of the dam, which would quickly cause it to erode away; instead, water seeps out of the base of the dam at a rate which approximately matches the rate of inflow, mai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
River Regime
The river regime generally describes the character of the typical fluctuations of flow of a river, but can also refer to the mathematical relationship between the river discharge and its width, depth and slope. Thus, "river regime" can describe one of two characteristics of a reach of an alluvial river: * The variability in its discharge throughout the course of a year in response to precipitation, temperature, evapotranspiration and drainage basin characteristics (Beckinsale, 1969) * A series of characteristic power-law relationships between discharge and width, depth and slope The latter is described by the fact that the discharge through a river of an approximate rectangular cross-section must, through conservation of mass, equal :Q = \bar b h where Q is the volumetric discharge, \bar is the mean flow velocity, b is the channel width (breadth) and h is the channel depth. Because of this relationship, as discharge increases, depth, width, and/or mean velocity must increase as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aggradation
Aggradation (or alluviation) is the term used in geology for the increase in land elevation, typically in a river system, due to the deposition of sediment. Aggradation occurs in areas in which the supply of sediment is greater than the amount of material that the system is able to transport. The mass balance between sediment being transported and sediment in the bed is described by the Exner equation. Typical aggradational environments include lowland alluvial rivers, river deltas, and alluvial fans. Aggradational environments are often undergoing slow subsidence which balances the increase in land surface elevation due to aggradation. After millions of years, an aggradational environment will become a sedimentary basin, which contains the deposited sediment, including paleochannels and ancient floodplains. Aggradation can be caused by changes in climate, land use, and geologic activity, such as volcanic eruption, earthquakes, and faulting. For example, volcanic eruptions may 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] |
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