97-558: The Beipan River Guanxing Highway Bridge or Beipanjiang River 2003 Bridge is a 366-metre-high suspension bridge on the Guanxing Highway near Xingbei Town (Xinbeizhen), Zhenfeng County , Guizhou Province, China . The bridge has a span length of 388 metres. When it opened in 2003, it was the world's highest bridge , and it held that title until the opening of the Hegigio Gorge Pipeline Bridge in 2005. When
194-410: A cable-stayed bridge in which the deck is in compression. Cable-stayed bridges and suspension bridges may appear to be similar, but are quite different in principle and in their construction. In suspension bridges, large main cables (normally two) hang between the towers and are anchored at each end to the ground. The main cables, which are free to move on bearings in the towers, bear the load of
291-456: A 200 feet span (also termed Beose Bridge) was constructed near Sagar, India during 1828–1830 by Duncan Presgrave, Mint and Assay Master. The Clifton Suspension Bridge (designed in 1831, completed in 1864 with a 214 m central span), is similar to the Sagar bridge. It is one of the longest of the parabolic arc chain type. The current Marlow suspension bridge was designed by William Tierney Clark and
388-492: A bridge has a tendency to collapse simply because of the gravitational forces acting on the materials of which the bridge is made. Live load refers to traffic that moves across the bridge as well as normal environmental factors such as changes in temperature, precipitation, and winds. Dynamic load refers to environmental factors that go beyond normal weather conditions, factors such as sudden gusts of wind and earthquakes. All three factors must be taken into consideration when building
485-468: A bridge. Silver Bridge (USA) was an eyebar chain highway bridge, built in 1928, that collapsed in late 1967, killing forty-six people. The bridge had a low-redundancy design that was difficult to inspect. The collapse inspired legislation to ensure that older bridges were regularly inspected and maintained. Following the collapse a bridge of similar design was immediately closed and eventually demolished. A second similarly-designed bridge had been built with
582-757: A bridge. The principles of suspension used on a large scale also appear in contexts less dramatic than road or rail bridges. Light cable suspension may prove less expensive and seem more elegant for a cycle or footbridge than strong girder supports. An example of this is the Nescio Bridge in the Netherlands, and the Roebling designed 1904 Riegelsville suspension pedestrian bridge across the Delaware River in Pennsylvania. The longest pedestrian suspension bridge, which spans
679-556: A census in southern Bhutan to guard against illegal immigration, a constant issue in the south where borders with India are porous. Each family was required to present census workers with a tax receipt from the year 1958—no earlier, no later—or with a certificate of origin, which had to be obtained from one's place of birth, to prove that they were indeed Bhutanese citizens. Previously issued citizenship cards were no longer accepted as proof of citizenship. Alarmed by these measures, many began to protest for civil and cultural rights and demanded
776-452: A code of traditional Drukpa dress and etiquette called Driglam Namzhag . The dress element of this code required all citizens to wear the gho (a knee-length robe for men) and the kira (an ankle-length dress for women). A central plank of the Bhutanese government's policy since the late 1960s has been to modernise the use of Dzongkha language. This began with abandoning the use of Hindi ,
873-451: A forest cover of 64% as of October 2005. Bhutan's climate varies with elevation, from subtropical in the south to temperate in the highlands and polar-type climate with year-round snow in the north. Bhutan experiences five distinct seasons: summer, monsoon , autumn, winter and spring. Western Bhutan has the heavier monsoon rains; southern Bhutan has hot humid summers and cool winters; central and eastern Bhutan are temperate and drier than
970-492: A global biodiversity hotspot and counted among the 234 globally outstanding ecoregions of the world in a comprehensive analysis of global biodiversity undertaken by WWF between 1995 and 1997. According to the Swiss-based International Union for Conservation of Nature , Bhutan is viewed as a model for proactive conservation initiatives. The Kingdom has received international acclaim for its commitment to
1067-483: A government in Bumthang at Chakhar Gutho Palace. Much of early Bhutanese history is unclear because most of the records were destroyed when fire ravaged the ancient capital, Punakha , in 1827. By the 10th century, Bhutan's religious history had a significant impact on its political development. Various subsects of Buddhism emerged that were patronized by the various Mongol warlords. Bhutan may have been influenced by
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#17328586016871164-403: A higher margin of safety and remained in service until 1991. The Tacoma Narrows Bridge , (USA), 1940, was vulnerable to structural vibration in sustained and moderately strong winds due to its plate-girder deck structure. Wind caused a phenomenon called aeroelastic fluttering that led to its collapse only months after completion. The collapse was captured on film. There were no human deaths in
1261-448: A language that was adopted to help start formal secular education in the country, in 1964. As a result, at the beginning of the school year in March 1990, the teaching of Nepali language (which share similarities with Hindi) spoken by ethnic Lhotshampas in southern Bhutan was discontinued and all Nepali curricular materials were discontinued from Bhutanese schools. In 1988, Bhutan conducted
1358-505: A more democratic form of governance. In 1965, he set up a Royal Advisory Council, and in 1968 he formed a Cabinet. In 1971, Bhutan was admitted to the United Nations , having held observer status for three years. In July 1972, Jigme Singye Wangchuck ascended to the throne at the age of sixteen after the death of his father, Dorji Wangchuck. Bhutan's sixth Five-Year Plan (1987–92) included a policy of 'one nation, one people' and introduced
1455-688: A network of swift rivers that form deep valleys before draining into the Indian plains. In fact, 98.8% of Bhutan is covered by mountains, which makes it the most mountainous country in the world. Elevation rises from 200 m (660 ft) in the southern foothills to more than 7,000 m (23,000 ft). This great geographical diversity combined with equally diverse climate conditions contributes to Bhutan's outstanding range of biodiversity and ecosystems. Bhutan's northern region consists of an arc of Eastern Himalayan alpine shrub and meadows reaching up to glaciated mountain peaks with an extremely cold climate at
1552-581: A number of progressive environmental policies that have caused the head of the UNFCCC to call it an "inspiration and role model for the world on how economies and different countries can address climate change while at the same time improving the life of the citizen." For example, electric cars have been pushed in the country and as of 2014 make up a tenth of all cars. Because the country gets most of its energy from hydroelectric power , it does not emit significant greenhouse gases for energy production. In practice,
1649-696: A pedestrian suspension bridge over the Machchhu River in the city of Morbi, Gujarat, India collapsed, leading to the deaths of at least 141 people. Bhutan Bhutan , officially the Kingdom of Bhutan , is a landlocked country in South Asia situated in the Eastern Himalayas between China in the north and India in the south, with the Indian state of Sikkim separating it from neighbouring Nepal . With
1746-419: A population of over 727,145 and a territory of 38,394 square kilometres (14,824 sq mi), Bhutan ranks 133rd in land area and 160th in population. Bhutan is a constitutional monarchy with a Druk Gyalpo (king) as the head of state and a prime minister as the head of government . The Je Khenpo is the head of the state religion , Vajrayana Buddhism. The subalpine Himalayan mountains in
1843-641: A proposal by Robert Stevenson for a bridge over the River Almond near Edinburgh . Roebling's Delaware Aqueduct (begun 1847) consists of three sections supported by cables. The timber structure essentially hides the cables; and from a quick view, it is not immediately apparent that it is even a suspension bridge. The main suspension cables in older bridges were often made from a chain or linked bars, but modern bridge cables are made from multiple strands of wire. This not only adds strength but improves reliability (often called redundancy in engineering terms) because
1940-538: A sequence generally described as follows. Depending on length and size, construction may take anywhere between a year and a half (construction on the original Tacoma Narrows Bridge took only 19 months) up to as long as a decade (the Akashi-Kaikyō Bridge's construction began in May 1986 and was opened in May 1998 – a total of twelve years). Suspension bridges are typically ranked by the length of their main span. These are
2037-722: A single state. Namgyal defeated three Tibetan invasions, subjugated rival religious schools, codified the Tsa Yig legal system, and established a government of theocratic and civil administrators. Namgyal became the first Zhabdrung Rinpoche and his successors acted as the spiritual leaders of Bhutan, like the Dalai Lama in Tibet. During the 17th century, Bhutan controlled large parts of northeast India , Sikkim and Nepal ; it also wielded significant influence in Cooch Behar State . Bhutan ceded
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#17328586016872134-784: A sparse population of migratory shepherds. The Black Mountains in Bhutan's central region form a watershed between two major river systems: the Mo Chhu and the Drangme Chhu. Peaks in the Black Mountains range between 1,500 and 4,925 m (4,921 and 16,158 ft) above sea level, and fast-flowing rivers have carved out deep gorges in the lower mountain areas. The forests of the central Bhutan mountains consist of Eastern Himalayan subalpine conifer forests in higher elevations and Eastern Himalayan broadleaf forests in lower elevations. The Woodlands of
2231-570: A telescope, and offered him their services in the war against Tibet, but the Zhabdrung declined the offer. After a stay of nearly eight months Cacella wrote a long letter from the Chagri Monastery reporting on his travels. This is a rare extant report of the Zhabdrung. When Ngawang Namgyal died in 1651, his passing was kept secret for 54 years. After a period of consolidation, Bhutan lapsed into internal conflict. In 1711, Bhutan went to war against
2328-499: A temporary walkway. Poured sockets are used to make a high strength, permanent cable termination. They are created by inserting the suspender wire rope (at the bridge deck supports) into the narrow end of a conical cavity which is oriented in-line with the intended direction of strain. The individual wires are splayed out inside the cone or 'capel', and the cone is then filled with molten lead-antimony-tin (Pb80Sb15Sn5) solder. Most suspension bridges have open truss structures to support
2425-404: A total change to be brought to the political system that existed since 1907. As protests and related violence swept across southern Bhutan, the government in turn increased its resistance. People present at protests were labeled "anti-national terrorists". After the demonstrations, the Bhutanese army and police began the task of identifying participants and supporters engaged in the violence against
2522-617: A two-dose shot of AstraZeneca vaccines. On 13 December 2023, Bhutan was officially delisted as a least developed country . Bhutan is on the southern slopes of the eastern Himalayas , landlocked between the Tibet Autonomous Region of China to the north and the Indian states of Sikkim , West Bengal , Assam to the west and south, and the Indian state of Arunachal Pradesh to the east. It lies between latitudes 26°N and 29°N , and longitudes 88°E and 93°E . The land consists mostly of steep and high mountains crisscrossed by
2619-589: Is Jigme Khesar Namgyel Wangchuck . The current Prime Minister of Bhutan is Tshering Tobgay , leader of the People's Democratic Party . Bhutan's democratic transition in 2008 is seen as an evolution of its social contract with the monarchy since 1907. In 2019, Bhutan was classified in the Democracy Index as a hybrid regime alongside regional neighbours Nepal and Bangladesh . Minorities have been increasingly represented in Bhutan's government since 2008, including in
2716-504: Is Thimphu , with close to 15% of the population. Bhutan and neighbouring Tibet experienced the spread of Buddhism , which originated in the Indian subcontinent during the lifetime of the Buddha . In the first millennium, the Vajrayana school of Buddhism spread to Bhutan from the southern Pala Empire of Bengal. During the 16th century, Ngawang Namgyal unified the valleys of Bhutan into
2813-550: Is a type of bridge in which the deck is hung below suspension cables on vertical suspenders. The first modern examples of this type of bridge were built in the early 1800s. Simple suspension bridges , which lack vertical suspenders, have a long history in many mountainous parts of the world. Besides the bridge type most commonly called suspension bridges, covered in this article, there are other types of suspension bridges . The type covered here has cables suspended between towers , with vertical suspender cables that transfer
2910-440: Is around 71% of the total land area, equivalent to 2,725,080 hectares (ha) of forest in 2020, up from 2,506,720 hectares (ha) in 1990. In 2020, naturally regenerating forest covered 2,704,260 hectares (ha) and planted forest covered 20,820 hectares (ha). Of the naturally regenerating forest 15% was reported to be primary forest (consisting of native tree species with no clearly visible indications of human activity) and around 41% of
3007-410: Is connected to one another through a vast network of biological corridors, allowing animals to migrate freely throughout the country. Environmental conservation has been placed at the core of the nation's development strategy, the middle path. It is not treated as a sector but rather as a set of concerns that must be mainstreamed in Bhutan's overall approach to development planning and to be buttressed by
Beipan River Guanxing Highway Bridge - Misplaced Pages Continue
3104-627: Is considered the last remaining Inca rope bridge and is rebuilt annually. The first iron chain suspension bridge in the Western world was the Jacob's Creek Bridge (1801) in Westmoreland County, Pennsylvania , designed by inventor James Finley . Finley's bridge was the first to incorporate all of the necessary components of a modern suspension bridge, including a suspended deck which hung by trusses. Finley patented his design in 1808, and published it in
3201-481: The Ophiocordyceps sinensis fungus crop collected from the wild has also resulted in unsustainable exploitation which is proving very difficult to regulate. Bhutan has enforced a plastic ban rule from 1 April 2019, where plastic bags were replaced by alternative bags made of jute and other biodegradable material. Bhutan is a constitutional monarchy with a parliamentary form of government. The reigning monarch
3298-567: The Bengal Duars to British India during the Duar War in the 19th century. The Wangchuck dynasty emerged as the monarchy and pursued closer ties with Britain in the subcontinent. In 1910, a treaty guaranteed British advice in foreign policy in exchange for internal autonomy in Bhutan. The arrangement continued under a new treaty with India in 1949 (signed at Darjeeling) in which both countries recognised each other's sovereignty. Bhutan joined
3395-715: The Himalayan black bear , red panda , squirrel , sambar , wild pig and barking deer . The alpine habitats of the great Himalayan range in the north are home to the snow leopard , blue sheep , Himalayan marmot , Tibetan wolf , antelope , Himalayan musk deer and the Bhutan takin , Bhutan's national animal . The endangered wild water buffalo occurs in southern Bhutan, although in small numbers. More than 770 species of bird have been recorded in Bhutan. The globally endangered white-winged duck has been added recently in 2006 to Bhutan's bird list. The 2010 BBC documentary Lost Land of
3492-797: The Mahakam River , located in Kutai Kartanegara Regency , East Kalimantan district on the Indonesia island of Borneo , was built in 1995, completed in 2001 and collapsed in 2011. Dozens of vehicles on the bridge fell into the Mahakam River . As a result of this incident, 24 people died and dozens of others were injured and were treated at the Aji Muhammad Parikesit Regional Hospital. Meanwhile, 12 people were reported missing, 31 people were seriously injured, and 8 people had minor injuries. Research findings indicate that
3589-1097: The Maldives in the Human Development Index , and 21st on the Global Peace Index as the most peaceful country in South Asia as of 2024, as well as the only South Asian country in the list's first quartile. Bhutan is also a member of the Climate Vulnerable Forum , the Non-Aligned Movement , BIMSTEC , the IMF , the World Bank , UNESCO and the World Health Organization (WHO). Bhutan ranked first in SAARC in economic freedom , ease of doing business , peace and lack of corruption in 2016. Bhutan has one of
3686-623: The Raja of the kingdom of Koch Bihar in the south. During the chaos that followed, the Tibetans unsuccessfully attacked Bhutan in 1714. In the 18th century, the Bhutanese invaded and occupied the kingdom of Koch Bihar. In 1772, the Maharaja of Koch Bihar appealed to the British East India Company which assisted by ousting the Bhutanese and later attacking Bhutan itself in 1774. A peace treaty
3783-517: The United Nations in 1971. It has since expanded relations with 55 countries. While dependent on the Indian military , Bhutan maintains its own military units . The 2008 Constitution established a parliamentary government with an elected National Assembly and a National Council . Bhutan is a founding member of the South Asian Association for Regional Cooperation (SAARC). In 2020, Bhutan ranked third in South Asia after Sri Lanka and
3880-512: The Yuan dynasty with which it shares various cultural and religious similarities. After the decline of the Yuan dynasty in the 14th century, these subsects vied with each other for supremacy in the political and religious landscape, eventually leading to the ascendancy of the Drukpa Lineage by the 16th century. Locally, Bhutan has been known by many names. The earliest Western record of Bhutan,
3977-460: The golden langur . A variant Assamese macaque has also been recorded, which is regarded by some authorities as a new species, Macaca munzala . The Bengal tiger , clouded leopard , hispid hare and the sloth bear live in the tropical lowland and hardwood forests in the south. In the temperate zone, grey langur , tiger, goral and serow are found in mixed conifer, broadleaf and pine forests. Fruit-bearing trees and bamboo provide habitat for
Beipan River Guanxing Highway Bridge - Misplaced Pages Continue
4074-448: The live and dead loads of the deck below, upon which traffic crosses. This arrangement allows the deck to be level or to arc upward for additional clearance. Like other suspension bridge types, this type often is constructed without the use of falsework . The suspension cables must be anchored at each end of the bridge, since any load applied to the bridge is transformed into tension in these main cables. The main cables continue beyond
4171-584: The war reparations , the Duars were ceded to the United Kingdom in exchange for a rent of ₹50,000 . The treaty ended all hostilities between British India and Bhutan. During the 1870s, power struggles between the rival valleys of Paro and Tongsa led to civil war in Bhutan, eventually leading to the ascendancy of Ugyen Wangchuck , the penlop (governor) of Trongsa . From his power base in central Bhutan, Ugyen Wangchuck defeated his political enemies and united
4268-541: The 1,000-foot (300 m) and 300-metre height thresholds (the Liuguanghe Bridge also passes these thresholds but is a beam bridge) as well as the first suspension bridge in the world to surpass the height of Colorado ’s Royal Gorge Bridge after a 74-year reign. The bridge is also the second of three Beipan River crossings to have been among the world's ten highest. The first was the 902-foot-high (275 m) Beipanjiang River Railway Bridge , which opened in 2001 and
4365-621: The 1627 Relação of the Portuguese Jesuits Estêvão Cacella and João Cabral , records its name variously as Cambirasi (among the Koch Biharis ), Potente , and Mon (an endonym for southern Tibet). Until the early 17th century, Bhutan existed as a patchwork of minor warring fiefdoms , when the area was unified by the Tibetan lama and military leader Ngawang Namgyal , who had fled religious persecution in Tibet. To defend
4462-467: The Bhutanese endonym Drukpa , "Dragon people," are similarly derived. Names similar to Bhutan—including Bohtan, Buhtan, Bottanthis, Bottan and Bottanter—began to appear in Europe around the 1580s. Jean-Baptiste Tavernier 's 1676 Six Voyages is the first to record the name Boutan . However, these names seem to have referred not to modern Bhutan but to the Kingdom of Tibet . The modern distinction between
4559-619: The Himalayan foothills, have rugged, sloping terrain and dry, porous soil with dense vegetation and abundant wildlife. The southern Duars have moderately fertile soil, heavy savanna grass, dense, mixed jungle, and freshwater springs. Mountain rivers, fed by melting snow or monsoon rains, empty into the Brahmaputra River in India. Data released by the Ministry of Agriculture showed that the country had
4656-741: The Philadelphia journal, The Port Folio , in 1810. Early British chain bridges included the Dryburgh Abbey Bridge (1817) and 137 m Union Bridge (1820), with spans rapidly increasing to 176 m with the Menai Bridge (1826), "the first important modern suspension bridge". The first chain bridge on the German speaking territories was the Chain Bridge in Nuremberg . The Sagar Iron Suspension Bridge with
4753-542: The River Paiva, Arouca Geopark , Portugal, opened in April 2021. The 516 metres bridge hangs 175 meters above the river. Where such a bridge spans a gap between two buildings, there is no need to construct towers, as the buildings can anchor the cables. Cable suspension may also be augmented by the inherent stiffness of a structure that has much in common with a tubular bridge . Typical suspension bridges are constructed using
4850-599: The Tiger follows an expedition to Bhutan. The expedition is notable for claiming to obtain the first footage of tigers living at 4,000 metres (13,000 ft) in the high Himalayas. The BBC footage shows a female tiger lactating and scent-marking, followed a few days later by a male tiger responding, suggesting that the cats could be breeding at this elevation. Camera traps also recorded footage of other rarely seen forest creatures, including dhole (or Indian wild dog), Asian elephants, leopards and leopard cats. In Bhutan forest cover
4947-432: The bridge deck. Before the deck is installed, the cables are under tension from their own weight. Along the main cables smaller cables or rods connect to the bridge deck, which is lifted in sections. As this is done, the tension in the cables increases, as it does with the live load of traffic crossing the bridge. The tension on the main cables is transferred to the ground at the anchorages and by downwards compression on
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#17328586016875044-528: The bridge was completed in 2003 it was the highest in the world, sitting 366 metres above the Beipan River . The bridge became the second Chinese span in two years to take the record. The first was the Liuguanghe Bridge in 2001. In 2009 a dam was constructed downstream from the bridge, reducing the drop to the water slightly. The Beipan River Guanxing Highway Bridge was the first suspension bridge to break
5141-507: The central region provide most of Bhutan's forest production. The Torsa , Raidāk , Sankosh , and Manas are Bhutan's main rivers, flowing through this region. Most of the population lives in the central highlands. In the south, the Sivalik Hills are covered with dense Himalayan subtropical broadleaf forests , alluvial lowland river valleys, and mountains up to around 1,500 m (4,900 ft) above sea level. The foothills descend into
5238-517: The ceremony. The British government promptly recognized the new monarchy. In 1910, Bhutan signed the Treaty of Punakha , a subsidiary alliance that gave the British control of Bhutan's foreign affairs and meant that Bhutan was treated as an Indian princely state . This had little real effect, given Bhutan's historical reticence, and also did not appear to affect Bhutan's traditional relations with Tibet. After
5335-484: The chains are not attached to abutments as is usual, but instead are attached to the main girders, which are thus in compression. Here, the chains are made from flat wrought iron plates, eight inches (203 mm) wide by an inch and a half (38 mm) thick, rivetted together. The first wire-cable suspension bridge was the Spider Bridge at Falls of Schuylkill (1816), a modest and temporary footbridge built following
5432-623: The collapse of James Finley's nearby Chain Bridge at Falls of Schuylkill (1808). The footbridge's span was 124 m, although its deck was only 0.45 m wide. Development of wire-cable suspension bridges dates to the temporary simple suspension bridge at Annonay built by Marc Seguin and his brothers in 1822. It spanned only 18 m. The first permanent wire cable suspension bridge was Guillaume Henri Dufour 's Saint Antoine Bridge in Geneva of 1823, with two 40 m spans. The first with cables assembled in mid-air in
5529-519: The collapse was largely caused by the construction failure of the vertical hanging clamp. It was also found that poor maintenance, fatigue in the cable hanger construction materials, material quality, and bridge loads that exceed vehicle capacity, can also have an impact on bridge collapse. In 2013 the Kutai Kartanegara Bridge rebuilt the same location and completed in 2015 with a Through arch bridge design. On 30 October 2022, Jhulto Pul ,
5626-517: The collapse; several drivers escaped their cars on foot and reached the anchorages before the span dropped. Yarmouth suspension bridge (England) was built in 1829 and collapsed in 1845, killing 79 people. Peace River Suspension Bridge (Canada), which was completed in 1943, collapsed when the north anchor's soil support for the suspension bridge failed in October 1957. The entire bridge subsequently collapsed. Kutai Kartanegara Bridge (Indonesia) over
5723-584: The country against intermittent Tibetan forays, Namgyal built a network of impregnable dzongs or fortresses, and promulgated the Tsa Yig , a code of law that helped to bring local lords under centralised control. Many such dzong still exist and are active centres of religion and district administration. Portuguese Jesuits Estêvão Cacella and João Cabral were the first recorded Europeans to visit Bhutan in 1627, on their way to Tibet. They met Zhabdrung Ngawang Namgyal, presented him with firearms, gunpowder and
5820-484: The country following several civil wars and rebellions during 1882–85. In 1907, an epochal year for the country, Ugyen Wangchuck was unanimously chosen as the hereditary king of the country by the Lhengye Tshog of leading Buddhist monks, government officials, and heads of important families, with the firm petition made by Gongzim Ugyen Dorji . John Claude White , British Political Agent in Bhutan, took photographs of
5917-619: The distinction between it and Greater Tibet . The first time a separate Kingdom of Bhutan appeared on a western map, it did so under its local name "Broukpa". Others include Lho Mon ("Dark Southland"), Lho Tsendenjong ("Southland of the Cypress "), Lhomen Khazhi ("Southland of the Four Approaches") and Lho Menjong ("Southland of the Herbs "). Stone tools, weapons, elephants, and remnants of large stone structures provide evidence that Bhutan
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#17328586016876014-464: The failure of a few flawed strands in the hundreds used pose very little threat of failure, whereas a single bad link or eyebar can cause failure of an entire bridge. (The failure of a single eyebar was found to be the cause of the collapse of the Silver Bridge over the Ohio River .) Another reason is that as spans increased, engineers were unable to lift larger chains into position, whereas wire strand cables can be formulated one by one in mid-air from
6111-616: The force of law. The country's constitution mentions environmental standards in multiple sections. Although Bhutan's natural heritage is still largely intact, the government has said that it cannot be taken for granted and that conservation of the natural environment must be considered one of the challenges that will need to be addressed in the years ahead. Nearly 56.3% of all Bhutanese are involved with agriculture, forestry or conservation. The government aims to promote conservation as part of its plan to target Gross National Happiness. It currently has net negative greenhouse gas emissions because
6208-528: The forest area was found within protected areas. For the year 2015, 100% of the forest area was reported to be under public ownership . More than 5,400 species of plants are found in Bhutan, including Pedicularis cacuminidenta . Fungi form a key part of Bhutanese ecosystems, with mycorrhizal species providing forest trees with mineral nutrients necessary for growth, and with wood decay and litter decomposing species playing an important role in natural recycling. The Eastern Himalayas has been identified as
6305-490: The highest elevations. Most peaks in the north are over 7,000 m (23,000 ft) above sea level; the highest point is 7,570-metre (24,840 ft)-tall Gangkhar Puensum , which has the distinction of being the highest unclimbed mountain in the world. The lowest point, at 98 m (322 ft), is in the valley of Drangme Chhu , where the river crosses the border with India. Watered by snow-fed rivers, alpine valleys in this region provide pasture for livestock, tended by
6402-432: The highway, which may be supported by suspender cables or their own trusswork . In cases where trusswork supports the spans, there will be very little arc in the outboard main cables. The earliest suspension bridges were ropes slung across a chasm, with a deck possibly at the same level or hung below the ropes such that the rope had a catenary shape. The Tibetan siddha and bridge-builder Thangtong Gyalpo originated
6499-415: The largest water reserves for hydropower in the world. Melting glaciers caused by climate change are a growing concern in Bhutan. The precise etymology of "Bhutan" is unknown, although it is likely to derive from the Tibetan endonym "Böd" for Tibet . Traditionally, it is taken to be a transcription of the Sanskrit Bhoṭa-anta ( भोट-अन्त ) "end of Tibet ", a reference to Bhutan's position as
6596-422: The last countries to introduce television. In his speech, the King said that television was a critical step to the modernisation of Bhutan as well as a major contributor to the country's gross national happiness , but warned that the "misuse" of this new technology could erode traditional Bhutanese values. A new constitution was presented in early 2005. In December 2005, Wangchuck announced that he would abdicate
6693-483: The live loads. In an underspanned suspension bridge, also called under-deck cable-stayed bridge, the main cables hang entirely below the bridge deck, but are still anchored into the ground in a similar way to the conventional type. Very few bridges of this nature have been built, as the deck is inherently less stable than when suspended below the cables. Examples include the Pont des Bergues of 1834 designed by Guillaume Henri Dufour ; James Smith's Micklewood Bridge; and
6790-400: The maintenance of its biodiversity. This is reflected in the decision to maintain at least sixty per cent of the land area under forest cover, to designate more than 40% of its territory as national parks, reserves and other protected areas, and most recently to identify a further nine per cent of land area as biodiversity corridors linking the protected areas. All of Bhutan's protected land
6887-446: The majority of the Lhotshampa refugees. Bhutan's political system has recently changed from an absolute monarchy to a constitutional monarchy . King Jigme Singye Wangchuck transferred most of his administrative powers to the Council of Cabinet Ministers and allowed for impeachment of the King by a two-thirds majority of the National Assembly. In 1999, the government lifted a ban on television and internet, making Bhutan one of
6984-684: The modern method was Joseph Chaley 's Grand Pont Suspendu in Fribourg , in 1834. In the United States, the first major wire-cable suspension bridge was the Wire Bridge at Fairmount in Philadelphia, Pennsylvania. Designed by Charles Ellet Jr. and completed in 1842, it had a span of 109 m. Ellet's Niagara Falls suspension bridge (1847–48) was abandoned before completion. It was used as scaffolding for John A. Roebling 's double decker railroad and carriage bridge (1855). The Otto Beit Bridge (1938–1939)
7081-509: The new Union of India gained independence from the United Kingdom on 15 August 1947, Bhutan became one of the first countries to recognise India's independence. On 8 August 1949, a treaty similar to that of 1910, in which Britain had gained power over Bhutan's foreign relations, was signed with the newly independent India. In 1953, King Jigme Dorji Wangchuck established the country's legislature—a 130-member National Assembly —to promote
7178-478: The north rise from the country's lush subtropical plains in the south. In the Bhutanese Himalayas , there are peaks higher than 7,000 metres (23,000 ft) above sea level . Gangkhar Puensum is Bhutan's highest peak and is the highest unclimbed mountain in the world. The wildlife of Bhutan is notable for its diversity, including the Himalayan takin and golden langur . The capital and largest city
7275-467: The overlap of these extensive protected lands with populated areas has led to mutual habitat encroachment. Protected wildlife has entered agricultural areas, trampling crops and killing livestock. In response, Bhutan has implemented an insurance scheme, begun constructing solar powered alarm fences, watch towers, and search lights, and has provided fodder and salt licks outside human settlement areas to encourage animals to stay away. The huge market value of
7372-406: The pillars to deck-level supports, and further continue to connections with anchors in the ground. The roadway is supported by vertical suspender cables or rods, called hangers. In some circumstances, the towers may sit on a bluff or canyon edge where the road may proceed directly to the main span. Otherwise, the bridge will typically have two smaller spans, running between either pair of pillars and
7469-413: The railing and the walking layer of Gyalpo's bridges used wires. The stress points that carried the screed were reinforced by the iron chains. Before the use of iron chains it is thought that Gyalpo used ropes from twisted willows or yak skins. He may have also used tightly bound cloth. The Inca used rope bridges , documented as early as 1615. It is not known when they were first made. Queshuachaca
7566-592: The roadbed, particularly owing to the unfavorable effects of using plate girders, discovered from the Tacoma Narrows Bridge (1940) bridge collapse. In the 1960s, developments in bridge aerodynamics allowed the re-introduction of plate structures as shallow box girders , first seen on the Severn bridge , built 1961–1966. In the picture of the Yichang Bridge , note the very sharp entry edge and sloping undergirders in
7663-517: The small amount of pollution it creates is absorbed by the forests that cover most of the country. While the entire country collectively produces 2,200,000 metric tons (2,200,000 long tons; 2,400,000 short tons) of carbon dioxide a year, the immense forest covering 72% of the country acts as a carbon sink , absorbing more than four million tons of carbon dioxide every year. Bhutan had a 2018 Forest Landscape Integrity Index mean score of 8.85/10, ranking it 16th globally out of 172 countries. Bhutan has
7760-616: The southern extremity of the Tibetan plateau and culture. Since the 17th century, Bhutan's official name has been Druk yul (literally, "country of the Drukpa Lineage " or "the Land of the Thunder Dragon," a reference to the country's dominant Buddhist sect); "Bhutan" appears only in English-language official correspondence. The terms for the Kings of Bhutan, Druk Gyalpo ("Dragon King"), and
7857-407: The state and people. They were arrested and held for months without trial. Soon the Bhutanese government arbitrarily reported that its census operations had detected the presence in southern Bhutan of over 100,000 "illegal immigrants" although this number is often debated. The census operations, thus, were used as a tool for the identification, eviction and banishment of dissidents who were involved in
7954-485: The subtropical Duars Plain, which is the eponymous gateway to strategic mountain passes (also known as dwars or dooars; literally, "doors" in Assamese , Bengali , Maithili , Bhojpuri , and Magahi languages). Most of the Duars is in India, but a 10 to 15 km (6.2 to 9.3 mi)-wide strip extends into Bhutan. The Bhutan Duars is divided into two parts, the northern and southern Duars. The northern Duars, which abut
8051-401: The suspension bridge shown. This enables this type of construction to be used without the danger of vortex shedding and consequent aeroelastic effects, such as those that destroyed the original Tacoma Narrows bridge. Three kinds of forces operate on any bridge: the dead load, the live load, and the dynamic load. Dead load refers to the weight of the bridge itself. Like any other structure,
8148-508: The ten bridges with the longest spans, followed by the length of the span and the year the bridge opened for traffic: (Chronological) Broughton Suspension Bridge (England) was an iron chain bridge built in 1826. One of Europe's first suspension bridges, it collapsed in 1831 due to mechanical resonance induced by troops marching in step. As a result of the incident, the British Army issued an order that troops should "break step" when crossing
8245-551: The throne in his son's favour in 2008. On 9 December 2006, he announced that he would abdicate immediately. This was followed by the first national parliamentary elections in December 2007 and March 2008 . On 6 November 2008, 28-year-old Jigme Khesar Namgyel Wangchuck was crowned king. In July 2021 during the COVID-19 pandemic , Bhutan became the first world-leading nation in its role of vaccinating 470,000 out of 770,000 people with
8342-489: The towers. In cable-stayed bridges, the towers are the primary load-bearing structures that transmit the bridge loads to the ground. A cantilever approach is often used to support the bridge deck near the towers, but lengths further from them are supported by cables running directly to the towers. By design, all static horizontal forces of the cable-stayed bridge are balanced so that the supporting towers do not tend to tilt or slide and so must only resist horizontal forces from
8439-691: The two did not begin until well into the Scottish explorer George Bogle 's 1774 expedition. Realising the differences between the two regions, cultures, and states, his final report to the East India Company formally proposed calling the Druk Desi 's kingdom "Boutan" and the Panchen Lama 's kingdom "Tibet". The EIC's surveyor general James Rennell first anglicised the French name as "Bootan," and then popularised
8536-440: The uprising against the state. Military and other security forces were deployed for forceful deportations of between 80,000 and 100,000 Lhotshampas and were accused of using widespread violence, torture, rape and killing. The evicted Lhotshampas became refugees in camps in southern Nepal. Since 2008, many Western countries, such as Canada, Norway, the United Kingdom, Australia, and the United States, have allowed resettlement of
8633-554: The use of iron chains in his version of simple suspension bridges . In 1433, Gyalpo built eight bridges in eastern Bhutan . The last surviving chain-linked bridge of Gyalpo's was the Thangtong Gyalpo Bridge in Duksum en route to Trashi Yangtse , which was finally washed away in 2004. Gyalpo's iron chain bridges did not include a suspended-deck bridge , which is the standard on all modern suspension bridges today. Instead, both
8730-423: The weight of the cables is small compared to the weight of the deck. One can see the shape from the constant increase of the gradient of the cable with linear (deck) distance, this increase in gradient at each connection with the deck providing a net upward support force. Combined with the relatively simple constraints placed upon the actual deck, that makes the suspension bridge much simpler to design and analyze than
8827-474: The west with warm summers and cool winters. Bhutan signed the Rio Convention on Biological Diversity on 11 June 1992, and became a party to the convention on 25 August 1995. It has subsequently produced a National Biodiversity Strategy and Action Plan , with two revisions, the most recent of which was received by the convention on 4 February 2010. Bhutan has a rich primate life, with rare species such as
8924-643: Was built between 1829 and 1832, replacing a wooden bridge further downstream which collapsed in 1828. It is the only suspension bridge across the non-tidal Thames. The Széchenyi Chain Bridge , (designed in 1840, opened in 1849), spanning the River Danube in Budapest, was also designed by William Clark and it is a larger-scale version of Marlow Bridge. An interesting variation is Thornewill and Warham 's Ferry Bridge in Burton-on-Trent , Staffordshire (1889), where
9021-578: Was first introduced to Bhutan in the 7th century AD. The Tibetan king Songtsen Gampo (reigned 627–649), a Buddhist convert, extended the Tibetan Empire into Sikkim and Bhutan. He ordered the construction of two Buddhist temples, Bumthang in central Bhutan and Kyichu (near Paro ) in the Paro Valley . Buddhism was propagated in earnest in 746 under King Sindhu Rāja ( also Künjom; Sendha Gyab; Chakhar Gyalpo), an exiled Indian king who had established
9118-588: Was inhabited as early as 2000 BC, although there are no existing records from that time. Historians have theorised that the state of Lhomon ( lit. ' southern darkness ' ), or Monyul ("Dark Land", a reference to the Monpa , an ethnic group in Bhutan and Arunachal Pradesh , India), may have existed between 500 BC and AD 600. The names Lhomon Tsendenjong ( Sandalwood Country) and Lhomon Khashi , or Southern Mon (country of four approaches), have been found in ancient Bhutanese and Tibetan chronicles. Buddhism
9215-511: Was signed in which Bhutan agreed to retreat to its pre-1730 borders. However, the peace was tenuous, and border skirmishes with the British were to continue for the next hundred years. The skirmishes eventually led to the Duar War (1864–65), a confrontation to control of the Bengal Duars . After Bhutan lost the war, the Treaty of Sinchula was signed between British India and Bhutan. As part of
9312-404: Was the first modern suspension bridge outside the United States built with parallel wire cables. Two towers/pillars, two suspension cables, four suspension cable anchors, multiple suspender cables, the bridge deck. The main cables of a suspension bridge will form a catenary when hanging under their own weight only. When supporting the deck, the cables will instead form a parabola , assuming
9409-523: Was the highest train bridge in the world until 2016 when China's Najiehe Railway Bridge and Qinglong Railway Bridge were opened. The Beipan River Hukun Expressway Bridge , the third bridge to cross high above the Beipanjiang, opened in 2009 on the Guiyang-to-Kunming Highway with a suspension span 1,083 feet (330 m) above the river. Suspension bridge A suspension bridge
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