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Döda Fallet
Döda fallet (English: ''dead fall'') is a former whitewater Rapids, rapid in of the river Indalsälven in Ragunda Municipality in the eastern part of the province of Jämtland in Sweden. Glacial debris had blocked the course of the Indalsälven at Döda fallet for thousands of years, creating a reservoir of glacial meltwater 25 km (16 mi) long known as Ragundasjön (English: ''Ragunda lake''), which overflowed over a natural spillway that bypassed this dam of debris, in a long high steep rapid known as Gedungsen or Storforsen (English: ''great whitewater rapid''). It was one of the most impressive rapids in Sweden with a total fall height of about 35 meters (115 feet) and a large water discharge. The lake disappeared and the falls went dry in the 1796 Ragunda lake burst disaster after a flood avulsion (river), rerouted the river through a small canal constructed to bypass the falls, carving a new channel and emptying the lake in four hours. Original situation The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Riksdag
The Riksdag ( , ; also or , ) is the parliament and the parliamentary sovereignty, supreme decision-making body of the Kingdom of Sweden. Since 1971, the Riksdag has been a unicameral parliament with 349 members (), elected proportional representation, proportionally and serving, since 1994, fixed four-year terms. The 2022 Swedish general election is the most recent general election. The constitutional mandates of the Riksdag are enumerated in the ''Basic Laws of Sweden#Instrument of Government, Instrument of Government'' (), and its internal workings are specified in greater detail in the Riksdag Act ().Instrument of Government as of 2012. Retrieved on 16 November 2012. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Varve
A varve is an annual layer of sediment or sedimentary rock. The word 'varve' derives from the Swedish word ''varv'' whose meanings and connotations include 'revolution', 'in layers', and 'circle'. Of the many rhythmites in the geological record, varves are one of the most important and illuminating in studies of past climate change. Varves are amongst the smallest-scale events recognised in stratigraphy. An annual layer can be highly visible because the particles washed into the layer in the spring when there is greater flow strength are much coarser than those deposited later in the year. This forms a pair of layers—one coarse and one fine—for each annual cycle. Varves form only in fresh or brackish water, because the high levels of salt in normal sea water coagulate the clay into coarse grains. Since the saline waters leave coarse particles all year, it is nearly impossible to distinguish the individual layers in salt waters. Indeed, clay flocculation occurs at high ioni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydroelectric Power Station
Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity, almost 4,210 TWh in 2023, which is more than all other renewable sources combined and also more than nuclear power. Hydropower can provide large amounts of low-carbon electricity on demand, making it a key element for creating secure and clean electricity supply systems. A hydroelectric power station that has a dam and reservoir is a flexible source, since the amount of electricity produced can be increased or decreased in seconds or minutes in response to varying electricity demand. Once a hydroelectric complex is constructed, it produces no direct waste, and almost always emits considerably less greenhouse gas than fossil fuel-powered energy plants. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hammarstrand
Hammarstrand is a locality and the seat of Ragunda Municipality in Jämtland County, Sweden with 1,052 inhabitants in 2010. The town is host to a bobsleigh and luge track. It was built on the dry bed of the former lake Ragundasjön, which drained suddenly and catastrophically in 1796. Bobsleigh and luge track Constructed in 1964, the track was 1045 meters longLuge at Hammarstrand. - accessed March 5, 2008 with 11 curves and a start height of 900 meters. - accessed March 5, 2008 Its last World Cup luge competition was held in 1990. Until the completion of the [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sundsvall–Timrå Airport
Sundsvall–Timrå Airport is about 21 km north of Sundsvall, 8 km east of Timrå and 32 km south of Härnösand, Sweden. The airport is also known as Midlanda, referring to its geographically central location in Sweden. It is Norrland's sixth-busiest airport and Sweden's fifteenth busiest. History The airport was built on delta land formed by much sediment and flood debris that washed down the Indalsälven river to the sea when the lake Ragundasjön drained suddenly and catastrophically in June 1796. The airport was inaugurated on 11 September 1944. The airport was known under the name ''Sundsvall–Härnösand Airport'' until the municipalities of Sundsvall and Timrå (but not Härnösand) obtained the ownership of the airport from Swedavia in June 2013. In 2016, Sundsvall airport had Sweden's first centre for remote control towers. Four airports have their ground movements controlled from an office building with camera view only. These four airports are Örns ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baltic Sea
The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by the countries of Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden, and the North European Plain, North and Central European Plain regions. It is the world's largest brackish water basin. The sea stretches from 53°N to 66°N latitude and from 10°E to 30°E longitude. It is a Continental shelf#Shelf seas, shelf sea and marginal sea of the Atlantic with limited water exchange between the two, making it an inland sea. The Baltic Sea drains through the Danish straits into the Kattegat by way of the Øresund, Great Belt and Little Belt. It includes the Gulf of Bothnia (divided into the Bothnian Bay and the Bothnian Sea), the Gulf of Finland, the Gulf of Riga and the Bay of Gdańsk. The "Baltic Proper" is bordered on its northern edge, at latitude 60°N, by Åland and the Gulf of Bothnia, on its northeastern edge by the Gulf of Finland, on its eastern edge by the Gulf of Riga, and in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Environmental Disaster
An environmental disaster or ecological disaster is defined as a catastrophic event regarding the natural environment that is due to human activity.Jared M. Diamond, '' Collapse: How Societies Choose to Fail or Succeed'', 2005 This point distinguishes environmental disasters from other disturbances such as natural disasters and intentional acts of war such as nuclear bombings. Environmental disasters show how the impact of humans' alteration of the land has led to widespread and/or long-lasting consequences. These disasters have included deaths of wildlife, humans and plants, or severe disruption of human life or health, possibly requiring migration. Some environmental disasters are the trigger source of more expansive environmental conflicts, where effected groups try to socially confront the actors responsible for the disaster. Environmental disasters Environmental disasters have historically affected agriculture, wildlife biodiversity, the economy, and human health. The most ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Erosion
Erosion is the action of surface processes (such as Surface runoff, water flow or wind) that removes soil, Rock (geology), rock, or dissolved material from one location on the Earth's crust#Crust, Earth's crust and then sediment transport, transports it to another location where it is deposit (geology), deposited. Erosion is distinct from weathering which involves no movement. Removal of rock or soil as clastic sediment is referred to as ''physical'' or ''mechanical'' erosion; this contrasts with ''chemical'' erosion, where soil or rock material is removed from an area by Solvation, dissolution. Eroded sediment or solutes may be transported just a few millimetres, or for thousands of kilometres. Agents of erosion include rainfall; bedrock wear in rivers; coastal erosion by the sea and Wind wave, waves; glacier, glacial Plucking (glaciation), plucking, Abrasion (geology), abrasion, and scour; areal flooding; Aeolian processes, wind abrasion; groundwater processes; and Mass wastin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porous
Porosity or void fraction is a measure of the void (i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and 100%. Strictly speaking, some tests measure the "accessible void", the total amount of void space accessible from the surface (cf. closed-cell foam). There are many ways to test porosity in a substance or part, such as industrial CT scanning. The term porosity is used in multiple fields including pharmaceutics, ceramics, metallurgy, materials, manufacturing, petrophysics, hydrology, earth sciences, soil mechanics, rock mechanics, and engineering. Void fraction in two-phase flow In gas-liquid two-phase flow, the void fraction is defined as the fraction of the flow-channel volume that is occupied by the gas phase or, alternatively, as the fraction of the cross-sectional area of the channel that is occupied by the gas phase. Void fraction usually varies from location to loca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
