A valley is an elongated low area often running between hills or mountains and typically containing 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 glacial ice . These glaciers may remain present in valleys in high mountains or polar areas.
41-667: Setesdal ( Urban East Norwegian: [ˈsêːtəsdɑːɫ] ; older name: Sætersdal ) is a valley and a traditional district in Agder County in southern Norway . It consists of the municipalities of Bykle , Valle , Bygland , Iveland , and Evje og Hornnes . The Otra river flows through the valley of Setesdal into the sea near Kristiansand . It flows southward from the Hardangervidda plateau in Telemark . The historic Setesdal starts at Evje and extends as far as
82-406: A 14 bhp (10 kW) engine and was certified for up to 92 passengers. In 1897, the boat was extended by 6 feet (1.8 m) and in 1914 she was further extended by 10 feet (3.0 m). She had a new boiler installed and new engine that produced 42 bhp (31 kW). Today the boat is 21 metres (69 ft) long and weighs 26 tonnes (26 long tons; 29 short tons). She is certified for up to
123-414: A broader floodplain may result. Deposition dominates over erosion. A typical river basin or drainage basin will incorporate each of these different types of valleys. Some sections of a stream or river valleys may have vertically incised their course to such an extent that the valley they occupy is best described as a gorge , ravine , or canyon . Rapid down-cutting may result from localized uplift of
164-533: A cirque glacier. During glacial periods, for example, the Pleistocene ice ages, it is in these locations that glaciers initially form and then, as the ice age proceeds, extend downhill through valleys that have previously been shaped by water rather than ice. Abrasion by rock material embedded within the moving glacial ice causes the widening and deepening of the valley to produce the characteristic U or trough shape with relatively steep, even vertical sides and
205-551: A maximum of 55 passengers. In the early years Bjoren was in regular use at a place called Kilefjorden , a part of the river Otra . When the Setesdal Line , a narrow gauge railroad , was opened to Byglandsfjord Station in 1896 and as a direct cause of this she was moved to her present location in Byglandsfjord, about 30 kilometres (19 mi) north in the valley Setesdal where she was in service until 1957. In
246-594: A narrow valley with steep sides. Gill is used to describe a ravine containing a mountain stream in Cumbria and the Pennines . The term combe (also encountered as coombe ) is widespread in southern England and describes a short valley set into a hillside. Other terms for small valleys such as hope, dean, slade, slack and bottom are commonly encountered in place-names in various parts of England but are no longer in general use as synonyms for valley . The term vale
287-432: A relatively flat bottom. Interlocking spurs associated with the development of river valleys are preferentially eroded to produce truncated spurs , typical of glaciated mountain landscapes. The upper end of the trough below the ice-contributing cirques may be a trough-end . Valley steps (or 'rock steps') can result from differing erosion rates due to both the nature of the bedrock (hardness and jointing for example) and
328-465: A slower rate than that of the main valley floor; thus the difference in the two valleys' depth increases over time. The tributary valley, composed of more resistant rock, then hangs over the main valley. Trough-shaped valleys also form in regions of heavy topographic denudation . By contrast with glacial U-shaped valleys, there is less downward and sideways erosion. The severe downslope denudation results in gently sloping valley sides; their transition to
369-427: A valley between its sides is referred to as the valley floor. The valley floor is typically formed by river sediments and may have fluvial terraces . The development of a river valley is affected by the character of the bedrock over which the river or stream flows, the elevational difference between its top and bottom, and indeed the climate. Typically the flow will increase downstream and the gradient will decrease. In
410-510: A variety of transitional forms between V-, U- and plain valleys can form. The floor or bottom of these valleys can be broad or narrow, but all valleys have a shoulder. The broader a mountain valley, the lower its shoulders are located in most cases. An important exception is canyons where the shoulder almost is near the top of the valley's slope. In the Alps – e.g. the Tyrolean Inn valley –
451-670: A watercourse only rarely. In areas of limestone bedrock , dry valleys may also result from drainage now taking place underground rather than at the surface. Rift valleys arise principally from earth movements , rather than erosion. Many different types of valleys are described by geographers, using terms that may be global in use or else applied only locally. Valleys may arise through several different processes. Most commonly, they arise from erosion over long periods by moving water and are known as river valleys. Typically small valleys containing streams feed into larger valleys which in turn feed into larger valleys again, eventually reaching
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#1732776492188492-405: Is a tributary valley that is higher than the main valley. They are most commonly associated with U-shaped valleys, where a tributary glacier flows into a glacier of larger volume. The main glacier erodes a deep U-shaped valley with nearly vertical sides, while the tributary glacier, with a smaller volume of ice, makes a shallower U-shaped valley. Since the surfaces of the glaciers were originally at
533-841: Is a railroad between Kristiansand and Byglandsfjord in southern Norway . It was opened to Hægeland in 1895, and to Byglandsfjord in 1896. This railroad was closed down in 1962 but parts of it exist today as a hobby railroad and it is in regular tourist use during the summer months. The SS Bjoren is an old steamboat that is in regular tourist use on a lake in the river Otra called Byglandsfjord . [REDACTED] Media related to Setesdal at Wikimedia Commons 58°55′13″N 7°43′14″E / 58.92025°N 7.72064°E / 58.92025; 7.72064 Valley At lower latitudes and altitudes, these 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
574-501: Is only 50 meters (160 ft) deep while the main fjord is around 1,300 meters (4,300 ft) at the same point. Glaciated terrain is not the only site of hanging streams and valleys. Hanging valleys are also simply the product of varying rates of erosion of the main valley and the tributary valleys. The varying rates of erosion are associated with the composition of the adjacent rocks in the different valley locations. The tributary valleys are eroded and deepened by glaciers or erosion at
615-488: Is the word cwm borrowed from Welsh . The word dale occurs widely in place names in the north of England and, to a lesser extent, in southern Scotland. As a generic name for a type of valley, the term typically refers to a wide valley, though there are many much smaller stream valleys within the Yorkshire Dales which are named "(specific name) Dale". Clough is a word in common use in northern England for
656-629: Is used in England and Wales to describe a wide river valley, usually with a particularly wide flood plain or flat valley bottom. In Southern England, vales commonly occur between the outcrops of different relatively erosion-resistant rock formations, where less resistant rock, often claystone has been eroded. An example is the Vale of White Horse in Oxfordshire. Some of the first human complex societies originated in river valleys, such as that of
697-520: The Latin terms for 'valley, 'gorge' and 'ditch' respectively. The German term ' rille ' or Latin term 'rima' (signifying 'cleft') is used for certain other elongate depressions on the Moon. See also: SS Bjoren SS Bjoren is a wood-fuelled steamboat that travels the route between Bygland- Byglandsfjord , Bygland and Bygland- Ose on the lake Byglandsfjorden in the municipality of Bygland in
738-504: The Nile , Tigris-Euphrates , Indus , Ganges , Yangtze , Yellow River , Mississippi , and arguably the Amazon . In prehistory , the rivers were used as a source of fresh water and food (fish and game), as well as a place to wash and a sewer. The proximity of water moderated temperature extremes and provided a source for irrigation , stimulating the development of agriculture . Most of
779-505: The Setesdal valley. She runs on Sundays in July. Using wood as fuel is a natural choice as there was, and still is, good local access to it. Using wood to fuel the steam engine contributes to make Bjoren a unique part of Norway's cultural heritage and a floating technical museum. The steamer Bjoren was built at Akers Mekaniske Verksted in 1866. She was 52 feet (16 m) long, had
820-668: The first civilizations developed from these river valley communities. Siting of settlements within valleys is influenced by many factors, including the need to avoid flooding and the location of river crossing points. Numerous elongate depressions have been identified on the surface of Mars , Venus , the Moon , and other planets and their satellites and are known as valles (singular: 'vallis'). Deeper valleys with steeper sides (akin to canyons) on certain of these bodies are known as chasmata (singular: 'chasma'). Long narrow depressions are referred to as fossae (singular: 'fossa'). These are
861-938: The 13th century in Setesdal, was demolished in the 17th century. Its portal, with several carved scenes illustrating the legend of Sigurd Fåvnesbane (Sigurd the Dragon-slayer), is on display at the University Museum of National Antiquities in Oslo ( Universitetets Oldsaksamling, Historisk Museum, Oslo ). Sigurd's slaying of Fafnir is described in the Prose Edda of Snorri Sturluson and the Völsungasaga as well as alluded to in Beowulf and Njáls saga . The Setesdal Line ( Norwegian : Setesdalsbanen )
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#1732776492188902-437: The 1920s, buses took most of the traffic in the valley and eventually, when a new road was built in the 1950s, the traffic reasons for the steamer was gone. The boat was put in storage, deterioration started and eventually she sank. In the 1970s, a group of local enthusiasts decided to make an attempt to preserve the boat. As the boat was counted as part of Norwegian history, the government saw its interests and they helped with
943-524: The Scandinavian ice sheet during the various ice ages advanced slightly uphill against the lie of the land. As a result, its meltwaters flowed parallel to the ice margin to reach the North Sea basin, forming huge, flat valleys known as Urstromtäler . Unlike the other forms of glacial valleys, these were formed by glacial meltwaters. Depending on the topography , the rock types , and the climate ,
984-511: The actual valley bottom is unclear. Trough-shaped valleys occur mainly in periglacial regions and in tropical regions of variable wetness. Both climates are dominated by heavy denudation. Box valleys have wide, relatively level floors and steep sides. They are common in periglacial areas and occur in mid-latitudes, but also occur in tropical and arid regions. Rift valleys, such as the Albertine Rift and Gregory Rift are formed by
1025-612: The expansion of the Earth 's crust due to tectonic activity beneath the Earth's surface. There are many terms used for different sorts of valleys. They include: Similar geographical features such as gullies , chines , and kloofs , are not usually referred to as valleys. The terms corrie , glen , and strath are all Anglicisations of Gaelic terms and are commonly encountered in place-names in Scotland and other areas where Gaelic
1066-536: The farm Bjåen, at the edge of the traditional region of Telemark. Øvre (Upper) Setesdal is in the municipality of Bykle. The municipalities of Iveland, Evje & Hornes and Bygland comprise the Nedre (Lower) Setesdal. Valle municipality is in the middle of the Setesdal valley. Norwegian National Road 9 runs through Setesdal. The oldest Norse form of the name was just Setr , and this was later replaced by Setrsdalr ('the dale/valley of Setr'). The common word setr has
1107-443: The flow slower and both erosion and deposition may take place. More lateral erosion takes place in the middle section of a river's course, as strong currents on the outside of its curve erode the bank. Conversely, deposition may take place on the inside of curves where the current is much slacker, the process leading to the river assuming a meandering character. In the lower valley, gradients are lowest, meanders may be much broader and
1148-524: The funding. The boat was restored at Drammen Shiprepairs A/S and in 1994 was once again ready to be used. Today, Bjoren is owned by the Bygland municipality and run by the company Bjoren AS . In addition, the local group called Bjorens venner (Friends of Bjoren) put a lot of effort into preserving the technical values of the boat. Bjoren is still receiving government funding and, as the world's only existing wood-fuelled steamboat still in service, she
1189-427: The land surface or rejuvenation of the watercourse as a result for example of a reduction in the base level to which the river is eroded, e.g. lowered global sea level during an ice age . Such rejuvenation may also result in the production of river terraces . There are various forms of valleys associated with glaciation. True glacial valleys are those that have been cut by a glacier which may or may not still occupy
1230-522: The law district " Telemark with Råbyggelag ". A Raabygger or Råbygger is one who lives in a corner; this is an apt description for the valley of Setesdal, which runs like a wedge into the heights of the mountain called Haukelifjell. Ascending the Otra valley from Evje , one reaches the lake Byglandsfjord . At this point one historically found one of the more pronounced cultural transitions in Norway; there
1271-399: The meaning 'homestead, farm' – and Setr was probably originally the name of an old, large farm in the central part of Valle . The old farm was then later divided into a lot of smaller parts, but the name survived as the name of the district. The Historia Norwegiæ , a short history of Norway written by a monk in the second half of the 12th century, reports that Setesdal was then part of
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1312-463: The ocean or perhaps an internal drainage basin . In polar areas and at high altitudes, valleys may be eroded by glaciers ; these typically have a U-shaped profile in cross-section, in contrast to river valleys, which tend to have a V-shaped profile. Other valleys may arise principally through tectonic processes such as rifting . All three processes can contribute to the development of a valley over geological time. The flat (or relatively flat) portion of
1353-436: The power of the moving ice. In places, a rock basin may be excavated which may later be filled with water to form a ribbon lake or else by sediments. Such features are found in coastal areas as fjords . The shape of the valley which results from all of these influences may only become visible upon the recession of the glacier that forms it. A river or stream may remain in the valley; if it is smaller than one would expect given
1394-446: The same elevation , the shallower valley appears to be 'hanging' above the main valley. Often, waterfalls form at or near the outlet of the upper valley. Hanging valleys also occur in fjord systems underwater. The branches of Sognefjord are much shallower than the main fjord. The mouth of Fjærlandsfjord is about 400 meters (1,300 ft) deep while the main fjord nearby is 1,200 meters (3,900 ft) deep. The mouth of Ikjefjord
1435-550: The shoulders are quite low (100–200 meters above the bottom). Many villages are located here (esp. on the sunny side) because the climate is very mild: even in winter when the valley's floor is filled with fog, these villages are in sunshine . In some stress-tectonic regions of the Rocky Mountains or the Alps (e.g. Salzburg ), the side valleys are parallel to each other, and are hanging . Smaller streams flow into rivers as deep canyons or waterfalls . A hanging valley
1476-849: The size of its valley, it can be considered an example of a misfit stream . Other interesting glacially carved valleys include: A tunnel valley is a large, long, U-shaped valley originally cut under the glacial ice near the margin of continental ice sheets such as that now covering Antarctica and formerly covering portions of all continents during past glacial ages. Such valleys can be up to 100 km (62 mi) long, 4 km (2.5 mi) wide, and 400 m (1,300 ft) deep (its depth may vary along its length). Tunnel valleys were formed by subglacial water erosion . They once served as subglacial drainage pathways carrying large volumes of meltwater. Their cross-sections exhibit steep-sided flanks similar to fjord walls, and their flat bottoms are typical of subglacial glacial erosion. In northern Central Europe,
1517-407: The upper valley, the stream will most effectively erode its bed through corrasion to produce a steep-sided V-shaped valley. The presence of more resistant rock bands, of geological faults , fractures , and folds may determine the course of the stream and result in a twisting course with interlocking spurs . In the middle valley, as numerous streams have coalesced, the valley is typically wider,
1558-407: The valley at the present day. Such valleys may also be known as glacial troughs. They typically have a U-shaped cross-section and are characteristic landforms of mountain areas where glaciation has occurred or continues to take place. The uppermost part of a glacial valley frequently consists of one or more 'armchair-shaped' hollows, or ' cirques ', excavated by the rotational movement downslope of
1599-526: The west than to those people down the valley. Between Valle in Setesdal on the western side of the mountains and Fyresdal on the eastern side, one finds a medieval trail that priests and bishops used to get between the counties of Agder and Telemark. This trail is named "The Bishop's Road"( Bispevegen ) and every year a march called "The Bishop's Road March" ( Bispevegmarsjen ) starts at Kleivgrend in Fyresdal . The Hylestad stave church , constructed in
1640-518: Was a radical change in racial characteristics, dress (folk costumes or Bunad ), architecture, dialect, folk music, dance (e.g., the ganger, a form of Bygdedans ), customs, and cuisine. Particularly obvious north of the mountain pass of Byklestigen , the people of upper Setesdal were observed to be more closely related in blood and speech to their eastern neighbours in Telemark, as well as their immediate neighbours in adjoining districts of Rogaland to
1681-414: Was once widespread. Strath signifies a wide valley between hills, the floor of which is either level or slopes gently. A glen is a river valley which is steeper and narrower than a strath. A corrie is a basin-shaped hollow in a mountain. Each of these terms also occurs in parts of the world formerly colonized by Britain . Corrie is used more widely by geographers as a synonym for (glacial) cirque , as