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Thursday, 29 November 2012

Volga River

The Volga (Russian: Во́лга; IPA: [ˈvolɡə] ( listen)) is the longest river in Europe; it is also Europe's largest river in terms of discharge and watershed. It flows through central Russia, and is widely viewed as the national river of Russia. Eleven of the twenty largest cities of Russia, including the capital, Moscow, are situated in the Volga's drainage basin. Some of the largest reservoirs in the world can be found along the Volga. The river has a symbolic meaning in Russian culture and is often referred to as Volga-Matushka (Volga-mother) in Russian literature and folklore

Nomenclature

The Russian hydronym Volga (Волга) derives from Proto-Slavic *vòlga "wetness, moisture", which is preserved in many Slavic languages, including Ukrainian vológa (воло́га) "moisture", Russian vlaga (влага) "moisture", Bulgarian vlaga (влага) "moisture", Czech vláha "dampness", and Serbo-Croatian vlȁga "moisture", among others.[2]
The Slavic name is a loan translation of earlier Scythian (Ῥᾶ) "Volga",[3] literally "wetness", seen also in Avestan Raŋhā "mythical stream" and Sogdian r’k "vein, blood vessel" (< *raha-ka),[4] and cognate with Sanskrit rasā́h "liquid, juice; mythical river".[5] The Scythian name survives in modern Mordvin Rav (Рав) "Volga".
The Turkic peoples living along the river formerly referred to it as Itil or Atil "big river". In modern Turkic languages, the Volga is known as İdel (Идел) in Tatar, Атăл (Atăl) in Chuvash, Idhel in Bashkir, Edil in Kazakh, and İdil in Turkish. The Turkic peoples associated the Itil's origin with the Kama River. Thus, a left tributary to the Kama River was named the Aq Itil "White Itil" which unites with the Kara Itil "Black Itil" at the modern city of Ufa.The name Indyl (Indɨl) is used in Adyge (Cherkess) language.
Among Asians the river was known by its other Turkic name Sarı-su "yellow water", but Mongols also used their own name: Ijil mörön "adaptation river". Presently the Mari, another Ugric group, call the river Юл (Jul), meaning "way" in Tatar. Formerly, they called the river Volgydo, a borrowing from Old Russian.

Description

The Volga is the longest river in Europe. It belongs to the closed basin of the Caspian Sea. Rising in the Valdai Hills 225 meters (738 ft) above sea level northwest of Moscow and about 320 kilometers (200 mi) southeast of Saint Petersburg, the Volga heads east past Lake Sterzh, Tver, Dubna, Rybinsk, Yaroslavl, Nizhny Novgorod, and Kazan. From there it turns south, flows past Ulyanovsk, Tolyatti, Samara, Saratov and Volgograd, and discharges into the Caspian Sea below Astrakhan at 28 meters (92 ft) below sea level. At its most strategic point, it bends toward the Don ("the big bend"). Volgograd, formerly Stalingrad, is located there.
The Saratov Bridge, running across the Volga, used to be the longest in Europe
The Volga has many tributaries, most importantly the Kama, the Oka, the Vetluga, and the Sura rivers. The Volga and its tributaries form the Volga river system, which flows through an area of about 1.35 million square kilometers in the most heavily populated part of Russia. The Volga Delta has a length of about 160 kilometres and includes as many as 500 channels and smaller rivers. The largest estuary in Europe, it is the only place in Russia where pelicans, flamingos, and lotuses may be found. The Volga freezes for most of its length for three months each year.
The Volga drains most of Western Russia. Its many large reservoirs provide irrigation and hydroelectric power. The Moscow Canal, the Volga–Don Canal, and the Volga–Baltic Waterway form navigable waterways connecting Moscow to the White Sea, the Baltic Sea, the Caspian Sea, the Sea of Azov and the Black Sea. High levels of chemical pollution have adversely affected the river and its habitats.
The fertile river valley provides large quantities of wheat, and also has many mineral riches. A substantial petroleum industry centers on the Volga valley. Other resources include natural gas, salt, and potash. The Volga Delta and the nearby Caspian Sea offer superb fishing grounds. Astrakhan, at the delta, is the center of the caviar industry.

Human history

Many Orthodox shrines and monasteries are strewn along the banks of the Volga
The downstream of the Volga, widely believed to have been a cradle of the Proto-Indo-European civilization, was settled by Huns and other Turkic peoples in the first millennium AD, replacing Scythians. The ancient scholar Ptolemy of Alexandria mentions the lower Volga in his Geography (Book 5, Chapter 8, 2nd Map of Asia). He calls it the Rha, which was the Scythian name for the river. Ptolemy believed the Don and the Volga shared the same upper branch, which flowed from the Hyperborean Mountains.
Subsequently, the river basin played an important role in the movements of peoples from Asia to Europe. A powerful polity of Volga Bulgaria once flourished where the Kama river joins the Volga, while Khazaria controlled the lower stretches of the river. Such Volga cities as Atil, Saqsin, or Sarai were among the largest in the medieval world. The river served as an important trade route connecting Scandinavia, Rus', and Volga Bulgaria with Khazaria and Persia.
Khazars were replaced by Kipchaks, Kimeks and Mongols, who founded the Golden Horde in the lower reaches of the Volga. Later their empire divided into the Khanate of Kazan and Khanate of Astrakhan, both of which were conquered by the Russians in the course of the 16th century Russo-Kazan Wars. The Russian people's deep feeling for the Volga echoes in national culture and literature, starting from the 12th-century Lay of Igor's Campaign.[6] The Volga Boatman's Song is one of many songs devoted to the national river of Russia.
Construction of Soviet dams often involved enforced resettlement of huge numbers of people, as well as destruction of their historical heritage. For instance, the town of Mologa was flooded for the purpose of constructing the Rybinsk Reservoir (then the largest artificial lake in the world). The construction of the Uglich Reservoir caused the flooding of several monasteries with buildings dating from the 15th and 16th centuries. In such cases the ecological and cultural damage often outbalanced any economical advantage.[7]

20th-century conflicts

Soviet Marines charge the Volga river bank.
During the Russian Civil War, both sides fielded warships on the Volga. In 1918, the Red Volga Flotilla participated in driving the Whites eastward, from the Middle Volga at Kazan to the Kama and eventually to Ufa on the Belaya River.[8]
In modern times, the city on the big bend of the Volga, currently known as Volgograd, witnessed the Battle of Stalingrad, possibly the bloodiest battle in human history, in which the Soviet Union and the German forces were deadlocked in a stalemate battle for access to the river. The Volga was (and still is) a vital transport route between central Russia and the Caspian Sea, which provides access to the oil fields of the Apsheron Peninsula. Hitler planned to use access to the oil fields of Azerbaijan to fuel future German conquests. Apart from that, whoever held both sides of the river could move valuable troops and war machines, across the river, to defeat the enemy's fortifications beyond the river.[9] By taking the river, Hitler's Germany would have been able to move supplies, guns, and men into the northern part of Russia.
For this reason, many amphibious military assaults were brought about in an attempt to remove the other side from the banks of the river. In these battles, the Soviet Union was the main offensive side, while the German troops used a more defensive stance, though most of the fighting was close quarters combat, with no clear offensive or defensive side.

Ethnic groups

Volga river at Kazan.
The first recorded people along the upper Volga were the Mari (Мари) and their west ethnic group named Merya (Мäрӹ). In the 8th and 9th centuries Slavic colonization began from Kievan Rus'. The Slavs brought Christianity, and a part of local people took Christianity and gradually became East Slavs; the remainder of Mari people migrated to the west far inland. In the course of several centuries they assimilated the indigenous Finnic population which included Merya and Meshchera peoples. The surviving peoples of Volga Finnic ethnicity include the Maris and Mordvins of the middle Volga.
Apart from the Huns, the earliest Turkic tribes arrived in the 7th century and assimilated some Finnic and Indo-European population on the middle and lower Volga. The Christian Chuvash and Muslim Tatars are descendants of the population of medieval Volga Bulgaria. Another Turkic group, the Nogais, formerly inhabited the lower Volga steppes.
The Volga region is home to a German minority group, the Volga Germans. Catherine the Great had issued a Manifesto in 1763 inviting all foreigners to come and populate the region, offering them numerous incentives to do so. This was partly to develop the region but also to provide a buffer zone between the Russians and the Mongol hordes to the East. Because of conditions in German territories, Germans responded in the largest numbers. Under the Soviet Union a slice of the region was turned into the Volga German Autonomous Soviet Socialist Republic. Others were executed or dispersed throughout the Soviet Union prior to and after World War II.

Navigation

The Volga has a rocky right bank
The Volga, widened for navigation purposes with construction of huge dams during the years of Joseph Stalin's industrialization, is of great importance to inland shipping and transport in Russia: all the dams in the river have been equipped with large (double) ship locks, so that vessels of considerable dimensions can actually travel from the Caspian Sea almost to the upstream end of the river.
Connections with the Don River and the Black Sea are possible through the Volga–Don Canal. Connections with the lakes of the North (Lake Ladoga, Lake Onega), Saint Petersburg and the Baltic Sea are possible through the Volga–Baltic Waterway; and a liaison with Moscow has been realised by the Moscow Canal connecting the Volga and the Moskva rivers.
This infrastructure has been designed for vessels of a relatively large scale (lock dimensions of 290 x 30 meters on the Volga, slightly smaller on some of the other rivers and canals) and it spans many thousands of kilometers. A number of formerly state-run, now mostly privatized, companies operate passenger and cargo vessels on the river; Volgotanker, with over 200 petroleum tankers, is one of them.
In the later Soviet era, up to the modern times, grain and oil have been among the largest cargo exports transported on the Volga.[10] Until recently access to the Russian waterways was granted to foreign vessels on a very limited scale. The increasing contacts between the European Union and Russia have led to new policies with regard to the access to the Russian inland waterways. It is expected that vessels of other nations will be allowed on Russian rivers soon.[11]








Wednesday, 28 November 2012

Akhurian River

The Akhurian, Akhuriyan, Akhuryan or Akhouryan (Armenian: Ախուրյան; Turkish: Arpaçay; Russian: Арпачай or Ахурян[1][2]) is a river in the South Caucasus. It originates in Armenia and flows from Lake Tseli south, along the border with Turkey, forming part of the geographic border between the two states, until it flows into the Aras River as a left tributary near Bagaran. The Akhurian drains an area of about 9,500 km² (3,700 mi²); and has total length of 186 km (116 mi).

History

When the Byzantine army arrived in the province of Shirak in 1041, local Armenian nobles (nakharars) assembled together against them under the command of the Pahlavuni general Vahram Pahlavouni. Vahram then selected a body of 30,000 infantry and 20,000 cavalry, forming three divisions, which fought against the Byzantines.[3] A battle ensued in which the invaders were routed with great slaughter. The fight was so ferocious that the effusion of blood flowing into the Akhurian River is said to have coloured its waters completely red.[4][5] The Byzantines left 20,000 dead behind. This victory allowed Vahram Pahlavuni along with Catholicos Petros Guedadarts to crown Gagik II king of Armenia and subsequently take the fortress of Ani, which had been in the hands of Vest Sarkis.

Bridges over the Akhurian River

Several medieval bridges once existed over the Akhurian River. The bridge at Ani may date back to the Bagratuni Dynasty.[6] More likely it dates to the thirteenth century. An inscription found nearby said that building work was done on the approach to the bridge in the early fourteenth century.[7]
The bridge's single arch has fallen, leaving only tall abutments that were perhaps part of a fortified gate.[7] Nineteenth century travelers reported a guardhouse next to the bridge, but this has since disappeared.[7]

Friday, 23 November 2012

Fly River

The Fly at 1,050 kilometres (650 mi), is the second longest river, after the Sepik, in Papua New Guinea. The Fly is the largest river in Oceania, the largest in the world without a single dam in its catchment, and overall ranks as the twenty-fifth largest river in the world by volume of discharge.[2] It rises in the Victor Emanuel Range arm of the Star Mountains, and crosses the south-western lowlands before flowing into the Gulf of Papua in a large delta.

Description

The Fly flows mostly through the Western Province, though for a small stretch it forms the boundary between PNG and the Indonesia province of Papua. This section protrudes slightly to the west of the 141°E longitude line.[3] To compensate for this slight gain in territory for PNG, the border south of the Fly River is slightly east of the 141°E longitude line. As part of this deal, Indonesia has the right to use the Fly River to its mouth for navigation.
The principal tributaries of the Fly are the Strickland and the Ok Tedi.

Delta

The original survey map created by L.M. D'Albertis in 1876
The estuary of the Fly River is 56 km wide at its entrance, but only 11 km wide abreast Kiwai Island, which may be considered as being the river mouth. Above this island the river gradually contracts to a width of 1.6 kilometers or less.
The river delta is studded with low and swampy islands covered with mangrove and nipa palm. There are villages and cultivated areas on these islands. The land on both sides of the estuary is of the same character. The islands in the estuary are flat and are covered with a thick, fertile alluvial soil. The largest islands are Kiwai Island, Purutu Island, Wabuda Island, Aibinio Island, Mibu Island, and Domori Island. Kiwai, Wabuda and Domori are inhabited.
A list of the river delta islands is:
  • Kiwai Island
  • Purutu Island
  • Wabuda Island
  • Aibinio Island
  • Mibu Island
  • Magabu Island
  • Invitato Island
  • Sisiabu Island
  • Nikira Island
  • Badu Island
  • Baiabe Island
  • Moroge Island
  • Gebaro Island
  • Dawari Island
  • Wariura Island
  • War Island
  • Kesuguruguru Island
  • Abaura Island
  • Abo Island
  • Boromura Island
  • Ura Island
  • Dogope Island
  • Sumogi Island
  • Sobowada Island
  • Abaurai Island
  • Samari
  • Reginimi Island
  • Dibiri Island
  • Sobuwabuda Island
  • Orope Island
  • Aeginimi Islands
  • Umuda Island
  • Midima Island
  • Domori Island
  • Dubuwaro Island
  • Kuragimini Island
  • Daura Island
  • Kunagimini Islands
Map of Fly River Delta
The inhabitants of the Fly River delta engage in agriculture and hunting. Coconut palm, breadfruit, plantain, sago palm, and sugar cane are grown.

History

The Fly was first discovered by Europeans in 1842 when Francis Blackwood commanding the corvette HMS Fly, surveryed the western coast of the Gulf of Papua.[4] The river was named after his ship and he proclaimed that it would be possible for a small steam powered boat to travel up the mighty river.[5]
In 1876 Italian explorer, Luigi D'Albertis, was the first person to successfully attempt this when he travelled 900 km into the interior of New Guinea, in his steamer, Neva. It was the furthest any European explorer had ever been into the island.[5]

Environmental issues

Both the Strickland and the Ok Tedi river have been the source of environmental controversy due to tailings waste from the Porgera Mine and the Ok Tedi Mine respectively. In 2008, Dr Ian Campbell, a former advisor to Ok Tedi Mining Limited, claimed that company data suggests significant portions of the Fly River floodplain are at a high risk from acid mine drainage.[6]

Yalu River/Amrok

The Yalu River (also called the Amrok in Korea, and erroneously Yalü) is a river on the border between North Korea and China. Together with the Tumen River to its east, and a small portion of Baekdu (Changbai) Mountain, the Yalu forms the border between North Korea and China and is notable as a site involved in military conflicts in the First Sino-Japanese War, the Russo-Japanese War, and the Korean War.

The Chinese name "Yalu" literally means "Duck Green", but the characters were chosen to phonetically approximate the original Manchu word "Yalu" in Mandarin. The Manchu word "Yalu" means "the boundary between two countries".[citation needed] The character "綠" in the Yalu (鴨綠) is normally pronounced when it's used as an adjective "green," but here it is pronounced and the usage of the reading is nonsensical in this name. To a Chinese speaker, these all reinforce the purely phonetic nature of the name. The Korean name is the Korean pronunciation of the Chinese characters.

Geography

 

Name

The Chinese name "Yalu" literally means "Duck Green", but the characters were chosen to phonetically approximate the original Manchu word "Yalu" in Mandarin. The Manchu word "Yalu" means "the boundary between two countries".[citation needed] The character "綠" in the Yalu (鴨綠) is normally pronounced when it's used as an adjective "green," but here it is pronounced and the usage of the reading is nonsensical in this name. To a Chinese speaker, these all reinforce the purely phonetic nature of the name. The Korean name is the Korean pronunciation of the Chinese characters.

Geography

From 2,500 m above sea level on Changbai Mountain, on the China-North Korea border, the river flows south to Hyesan before sweeping 130 km northwest to Linjiang and then returning to a more southerly route for a further 300 km to empty into the Korea Bay between Dandong (China) and Sinŭiju (North Korea).
The bordering Chinese provinces are Jilin and Liaoning.
The river is 790 km (491 mi) long and receives the water from over 30,000 km² of land. The Yalu's most significant tributaries are the Changjin (장진강, 長津江), Heochun (허천강, 虚川江), Tokro and Ai (瑷河) rivers. The river is not easily navigable for most of its length.[1]
The depth of the Yalu River varies from some of the more shallow parts on the eastern side in Hyesan (1 metre) to the deeper parts of the river near the Yellow Sea (2.5 metres).[2]
There are 205 islands on the Yalu. A 1962 border treaty between North Korea and China split the islands according to which ethnic group were living on each island. North Korea possesses 127 and China 78. Due to the division criteria, some islands such as Hwanggumpyong Island belong to North Korea but abut the Chinese side of the river.

History

The river basin is the site where the ancient kingdom of Goguryeo rose to power. Many former fortresses are located along the river and the former capital of that kingdom was situated at what is now the medium-sized city of Ji'an, China along the Yalu, a site rich in Goguryeo era relics.
Wihwa Island on the river is historically famous for the decision of General Yi Songgye in 1392 to there turn back his army southward to Kaesong in the first of a series of revolts that eventually led to the establishment of the Yi Dynasty.[3]
The river has been the site of several battles because of its strategic location between Korea and China, including:
The Korean side of the river was heavily industrialized during Colonial Korea (1910–1945), and by 1945 almost 20% of Imperial Japan's total industrial output originated in Korea. During the Korean War the movement of United Nations troops approaching the river precipitated massive Chinese intervention from around Dandong. In the course of the conflict every bridge across the river except one was destroyed. The one remaining bridge was the Sino-Korea Friendship Bridge connecting Sinuiju, North Korea to Dandong, China. During the war the valley surrounding the western end of the river also became the focal point of a series of dogfights for air superiority over North Korea, earning the nickname "MiG Alley" in reference to the MiG-15 fighters flown by the combined North Korean, Chinese and Soviet forces.
It was the advance of UN forces during the Korean War toward the Yalu which prompted Chairman Mao Zedong to involve China in the war for fear of an American invasion, since toppling communism was one of America's stated goals and Douglas MacArthur had expressed his desire to expand the war into China.
The river has frequently been crossed by North Koreans fleeing to China since the early 1990s.[citation needed]

Economy

The river is important for hydroelectric power, and one of the largest hydroelectric dams in Asia is in Sup'ung Rodongjagu, 100 m high and over 850 m long, located upstream from Sinuiju, North Korea. The dam has created an artificial lake over a portion of the river, called Sapung Lake. In addition the river is used for transportation, particularly of lumber from its forested banks. The river provides fish for the local population. Further upstream is the Yunfeng Dam.

Crossings


Two bridges crossing the Yalu (Amnokgang) at Sinŭiju and Dandong
From 2,500 m above sea level on Changbai Mountain, on the China-North Korea border, the river flows south to Hyesan before sweeping 130 km northwest to Linjiang and then returning to a more southerly route for a further 300 km to empty into the Korea Bay between Dandong (China) and Sinŭiju (North Korea).

Friday, 16 November 2012

Naf River

Naf River (Burmese: နတ်မြစ် [naʔ mjɪʔ]; Arakanese: နတ်မြစ် [nɛ́ mràɪʔ]; Bengali: নাফ নদী, IPA: [ná́f nədí]; ; is a river marking the border of Bangladesh and Myanmar.
It is an elongated estuary in the extreme southeast of Cox's Bazar district dividing the district from Arakan, Myanmar. It rises in the Arakan hills on the southeastern borders of the district and flows into the Bay of Bengal. Its width varies from 1.61 km to 3.22 km. The river is influenced by tide. Sittwe in Myanmar is on the eastern bank and Teknaf upazila of Cox's Bazar district is on the western bank of the river.
The Naf River's average depth is 128 feet (39 m) and maximum depth is 400 feet (120 m).
Historically, Shapuree island located at the mouth of the river, plays important role and considered as one of the immediate causes for the first Anglo-Burmese War.

Attacks on Fishermen and Refugees

Regular incidents in which fishermen and refugees were shot by Myanmar Army troops have occurred on the Naf River. These include, but are not limited to, the following events:
February, 1992- The Lun Htin, A Burmese paramilitary force killed 20 refugees while crossing the Naf river to Bangladesh. [1]
March 24, 1994- Members of the Myanmar Army's Western Military Command patrolling the Naf River found a group of Rohingya Muslims fishing from a small country boat. The soldiers tried to extort money from the fishermen, but when they were unable to do so, tied them up with rope and brought them to Balu Khali Village in Maungdaw Township.[2] Eight of the Rohingya fishermen were interrogated and tortured for five days and then they were all shot by firing squad.[3]
October 27, 2001- Burmese border troops killed one Bangladeshi man, wounded two and abducted 13 while they were fishing in the Naf River.[4]
January 22, 2005- 70 people were shot and killed when Burmese border guards opened fire on a group of 50 boats attempting to cross the river. The border guards claimed that they believed the boats contained "smuggled rice," implying that their actions, culminating in the mass shooting of unarmed people was justified. [5]
Summer, 2012- Hundreds if not thousands of Burmese Rohingya people have been beaten, raped, killed or forced to flee their homes across the Naf River to Bangladesh [6] [7] and on July 11, 2012 Burmese President Thein Sein suggested that the Rohingya people be expelled from Myanmar or have the UN relocate the 300,000 Rohingya people living in Myanmar, a policy the UN quickly rejected. [8]

Mekong

The Mekong (Thai: แม่น้ำโขง (Pronunciation)) is a river in Southeast Asia. It is the world's 13th-longest river[1] and the 7th-longest in Asia. Its estimated length is 4,350 km (2,703 mi),[1] and it drains an area of 795,000 km2 (307,000 sq mi), discharging 475 km3 (114 cu mi) of water annually[2]
From the Tibetan Plateau this river runs through China's Yunnan province, Burma (Myanmar), Laos, Thailand, Cambodia and Vietnam. In 1995, Laos, Thailand, Cambodia and Vietnam established the Mekong River Commission to assist in the management and coordinated use of the Mekong's resources. In 1996 China and Burma (Myanmar) became "dialogue partners" of the MRC and the six countries now work together within a cooperative framework.
The extreme seasonal variations in flow and the presence of rapids and waterfalls in this river have made navigation difficult. The river is a major trading route linking China’s southwestern province of Yunnan to Laos, Burma (Myanmar) and Thailand to the south, an important trade route between western China and Southeast Asia.

Drainage basin

The Mekong from Phou si
The confluence of the Mekong and the Nam Ou river in Laos.
The Mekong Basin can be divided into two parts: the 'Upper Mekong Basin' in Tibet and China, and the 'Lower Mekong Basin' from Yunnan downstream from China to the South China Sea.[4] From the point where it rises to its mouth, the most precipitous drop in the Mekong occurs in Upper Mekong Basin, a stretch of some 2,200 km (1,400 mi). Here, it drops 4,500 metres (14,800 ft) before it enters the Lower Basin where the borders of Thailand, Laos, China and Burma (Myanmar) come together in the Golden Triangle. Downstream from the Golden Triangle, the river flows for a further 2,600 km (1,600 mi) through Laos, Thailand and Cambodia before entering the South China Sea via a complex delta system in Vietnam.[4]

Upper Mekong Basin

The Upper Basin makes up 24% of the total area and contributes 15 to 20% of the water that flows into the Mekong River. The catchment here is steep and narrow. Soil erosion has been a major problem and approximately 50% of the sediment in the river comes from the Upper Basin.[4]
In Yunnan province in China, the river and its tributaries are confined by narrow, deep gorges. The tributary river systems in this part of the basin are small. Only 14 have catchment areas that exceed 1,000 km2 (390 sq mi), yet the greatest amount of Loss of forest cover in the entire river system per kilometer has occurred in this region due to heavy unchecked demand for natural resources. In the south of Yunnan, in Simao and Xishuangbanna Prefectures, the river changes as the valley opens out, the floodplain becomes wider, and the river becomes wider and slower.[4]

Lower Mekong Basin

Major tributary systems develop in the Lower Basin. These systems can be separated into two groups: tributaries that contribute to the major wet season flows, and tributaries that drain low relief regions of lower rainfall. The first group are left bank tributaries that drain the high-rainfall areas of Lao PDR. The second group are those on the right bank, mainly the Mun and Chi rivers, that drain a large part of Northeast Thailand.
Laos lies almost entirely within the Lower Mekong Basin. Its climate, landscape and land use are the major factors shaping the hydrology of the river. The mountainous landscape means that only 16% of the country is farmed under lowland terrace or upland shifting cultivation.[4] With upland shifting agriculture (slash and burn), soils recover within 10 to 20 years but the vegetation does not. Shifting cultivation is common in the uplands of Northern Laos and is reported to account for as much as 27% of the total land under rice cultivation.[4] As elsewhere in the basin, forest cover has been steadily reduced during the last three decades by shifting agriculture and permanent agriculture. The cumulative impacts of these activities on the river regime have not been measured. However, the hydrological impacts of land-cover changes induced by the Vietnam War were quantified in two sub-catchments of the Lower Mekong River Basin.[5]
Loss of forest cover in the Thai areas of the Lower Basin has been the highest in all the Lower Mekong countries over the past 60 years. On the Korat Plateau, which includes the Mun and Chi tributary systems, forest cover was reduced from 42% in 1961 to 13% in 1993.[4] Although this part of Northeast Thailand has an annual rainfall of more than 1,000 mm, a high evaporation rate means it is classified as a semi arid region. Consequently, although the Mun and Chi Basins drain 15% of the entire Mekong Basin, they only contribute 6% of the average annual flow.[4] Sandy and saline soils are the most common soil types, which makes much of the land unsuitable for wet rice cultivation. In spite of poor fertility, however, agriculture is intensive. Glutinous rice, maize and cassava are the principal crops.[4] Drought is by far the major hydrological hazard in this region.[4]
As the Mekong enters Cambodia, over 95% of the flows have already joined the river.[4] From here on downstream the terrain is flat and water levels rather than flow volumes determine the movement of water across the landscape. The seasonal cycle of changing water levels at Phnom Penh results in the unique “flow reversal” of water into and out of the Great Lake via the Tonle Sap River. Phnom Penh also marks the beginning of the delta system of the Mekong River. Here the mainstream begins to break up into an increasing number of branches.[4]
In Cambodia, the wet rice is the main crop and is grown on the flood plains of the Tonle Sap, Mekong and Bassac (the Mekong delta distributary known as the Hậu in Vietnam) rivers.[4] More than half of Cambodia remains covered with mixed evergreen and deciduous broadleaf forest, but forest cover has decreased from 73% in 1973 to 63% in 1993.[4] Here, the river landscape is flat. Small changes in water level determine the direction of water movement, including the large-scale reversal of flow into and out of the Tonle Sap basin from the Mekong River.[4]
Mekong Delta, Vietnam
The Mekong Delta in Viet Nam is farmed intensively and has little natural vegetation left. Forest cover is less than 10%. In the Central Highlands of Vietnam, forest cover was reduced from over 95% in the 1950s to around 50% in the mid 1990s.[4] Agricultural expansion and population pressure are the major reasons for land use and landscape change. Both drought and flood are common hazards in the Delta, which many people believe is the most sensitive to upstream hydrological change.[4]

Tuesday, 13 November 2012

Mekong

The Mekong (Thai: แม่น้ำโขง (Pronunciation)) is a river in Southeast Asia. It is the world's 13th-longest river[1] and the 7th-longest in Asia. Its estimated length is 4,350 km (2,703 mi),[1] and it drains an area of 795,000 km2 (307,000 sq mi), discharging 475 km3 (114 cu mi) of water annually[2]
From the Tibetan Plateau this river runs through China's Yunnan province, Burma (Myanmar), Laos, Thailand, Cambodia and Vietnam. In 1995, Laos, Thailand, Cambodia and Vietnam established the Mekong River Commission to assist in the management and coordinated use of the Mekong's resources. In 1996 China and Burma (Myanmar) became "dialogue partners" of the MRC and the six countries now work together within a cooperative framework.
The extreme seasonal variations in flow and the presence of rapids and waterfalls in this river have made navigation difficult. The river is a major trading route linking China’s southwestern province of Yunnan to Laos, Burma (Myanmar) and Thailand to the south, an important trade route between western China and Southeast Asia.

Names

In English the river is called "the Mekong River", derived from "Mae Nam Khong", a term of both Thai and Lao origin. In the Lao-Thai toponymy, all great rivers are considered "mother rivers" signalled by the prefix "mae", meaning "mother", and "nam" for water. In the Mekong's case, Mae Nam Khong means Khong, The Mother of Water.[3] "Khong" is derived from the Sanskrit "ganga", meaning the Ganges. Many Northern Thai and Laos locals refer to it as the "River Khong". Such is the case with the Mae Nam Ping in Chiang Mai which is known as the "Ping River". The Tonle Sap in Cambodia is a similar example – where Tonle translates as "Great lake or river", making the Tonle Sap River an unnecessary repetition of what is in fact the "Sap River".
Since the river flows through a number of countries, it has many different names in local languages:

Course

The Mekong rises in the "Three Rivers Area" on the Tibetan Plateau in the Sanjiangyuan National Nature Reserve as the Lancang, together with the Yangtze and Yellow (Huang He) Rivers.[2] It flows southwest through Yunnan Province, and through the Three Parallel Rivers Area in the Hengduan Mountains, along with the Salween River (Nujiang in Chinese) and the Yangtze.
After leaving China, it flows southwest and forms the border of Burma (Myanmar) and Laos for about 100 kilometres (62 mi) then turns southeast to briefly form the border of Laos with Thailand. The Mekong then flows east and south into Laos for some 400 kilometres (250 mi) and defines the Laos-Thailand border again for some 850 kilometres (530 mi) as it flows first east, passing in front of the capital of Laos, Vientiane, then turns south through central Southeast Asia. The river leaves the border and flows into Laos shortly before passing the city of Pakse. Thereafter, it runs more or less directly south, crossing into Cambodia.
At Phnom Penh the river is joined on the right bank by the river and lake system the Tonle Sap. When the Mekong is low, the Tonle Sap is a tributary; water flows from the lake and river into the Mekong. When the Mekong floods, the flow reverses; the floodwaters of the Mekong flow up the Tonle Sap.
Immediately after the Sap River joins the Mekong by Phnom Penh, the Bassac River branches off the right (south) bank. The Bassac River is the first and main distributary of the Mekong; thus, this is the beginning of the Mekong Delta. The two rivers, the Bassac to the south and the Mekong to the north, enter Vietnam very soon after this. In Vietnam, the Bassac is called the Hậu River (Sông Hậu or Hậu Giang); the main, northern, branch of the Mekong is called the Sông Tiền or Tiền Giang. In Vietnam, distributaries of the northern branch include the sông (river) Mỹ Tho, the sông Ba Lai, the sông Hàm Luông, and the sông Cổ Chiên.

Drainage basin

The Mekong from Phou si
The confluence of the Mekong and the Nam Ou river in Laos.
The Mekong Basin can be divided into two parts: the 'Upper Mekong Basin' in Tibet and China, and the 'Lower Mekong Basin' from Yunnan downstream from China to the South China Sea.[4] From the point where it rises to its mouth, the most precipitous drop in the Mekong occurs in Upper Mekong Basin, a stretch of some 2,200 km (1,400 mi). Here, it drops 4,500 metres (14,800 ft) before it enters the Lower Basin where the borders of Thailand, Laos, China and Burma (Myanmar) come together in the Golden Triangle. Downstream from the Golden Triangle, the river flows for a further 2,600 km (1,600 mi) through Laos, Thailand and Cambodia before entering the South China Sea via a complex delta system in Vietnam.[4]

Upper Mekong Basin

The Upper Basin makes up 24% of the total area and contributes 15 to 20% of the water that flows into the Mekong River. The catchment here is steep and narrow. Soil erosion has been a major problem and approximately 50% of the sediment in the river comes from the Upper Basin.[4]
In Yunnan province in China, the river and its tributaries are confined by narrow, deep gorges. The tributary river systems in this part of the basin are small. Only 14 have catchment areas that exceed 1,000 km2 (390 sq mi), yet the greatest amount of Loss of forest cover in the entire river system per kilometer has occurred in this region due to heavy unchecked demand for natural resources. In the south of Yunnan, in Simao and Xishuangbanna Prefectures, the river changes as the valley opens out, the floodplain becomes wider, and the river becomes wider and slower.[4]

Lower Mekong Basin

Major tributary systems develop in the Lower Basin. These systems can be separated into two groups: tributaries that contribute to the major wet season flows, and tributaries that drain low relief regions of lower rainfall. The first group are left bank tributaries that drain the high-rainfall areas of Lao PDR. The second group are those on the right bank, mainly the Mun and Chi rivers, that drain a large part of Northeast Thailand.
Laos lies almost entirely within the Lower Mekong Basin. Its climate, landscape and land use are the major factors shaping the hydrology of the river. The mountainous landscape means that only 16% of the country is farmed under lowland terrace or upland shifting cultivation.[4] With upland shifting agriculture (slash and burn), soils recover within 10 to 20 years but the vegetation does not. Shifting cultivation is common in the uplands of Northern Laos and is reported to account for as much as 27% of the total land under rice cultivation.[4] As elsewhere in the basin, forest cover has been steadily reduced during the last three decades by shifting agriculture and permanent agriculture. The cumulative impacts of these activities on the river regime have not been measured. However, the hydrological impacts of land-cover changes induced by the Vietnam War were quantified in two sub-catchments of the Lower Mekong River Basin.[5]
Loss of forest cover in the Thai areas of the Lower Basin has been the highest in all the Lower Mekong countries over the past 60 years. On the Korat Plateau, which includes the Mun and Chi tributary systems, forest cover was reduced from 42% in 1961 to 13% in 1993.[4] Although this part of Northeast Thailand has an annual rainfall of more than 1,000 mm, a high evaporation rate means it is classified as a semi arid region. Consequently, although the Mun and Chi Basins drain 15% of the entire Mekong Basin, they only contribute 6% of the average annual flow.[4] Sandy and saline soils are the most common soil types, which makes much of the land unsuitable for wet rice cultivation. In spite of poor fertility, however, agriculture is intensive. Glutinous rice, maize and cassava are the principal crops.[4] Drought is by far the major hydrological hazard in this region.[4]
As the Mekong enters Cambodia, over 95% of the flows have already joined the river.[4] From here on downstream the terrain is flat and water levels rather than flow volumes determine the movement of water across the landscape. The seasonal cycle of changing water levels at Phnom Penh results in the unique “flow reversal” of water into and out of the Great Lake via the Tonle Sap River. Phnom Penh also marks the beginning of the delta system of the Mekong River. Here the mainstream begins to break up into an increasing number of branches.[4]
In Cambodia, the wet rice is the main crop and is grown on the flood plains of the Tonle Sap, Mekong and Bassac (the Mekong delta distributary known as the Hậu in Vietnam) rivers.[4] More than half of Cambodia remains covered with mixed evergreen and deciduous broadleaf forest, but forest cover has decreased from 73% in 1973 to 63% in 1993.[4] Here, the river landscape is flat. Small changes in water level determine the direction of water movement, including the large-scale reversal of flow into and out of the Tonle Sap basin from the Mekong River.[4]
Mekong Delta, Vietnam
The Mekong Delta in Viet Nam is farmed intensively and has little natural vegetation left. Forest cover is less than 10%. In the Central Highlands of Vietnam, forest cover was reduced from over 95% in the 1950s to around 50% in the mid 1990s.[4] Agricultural expansion and population pressure are the major reasons for land use and landscape change. Both drought and flood are common hazards in the Delta, which many people believe is the most sensitive to upstream hydrological change.[4]


Natural history

Extirpated from most of its pan-Asian range, Cantor's giant softshell turtle can still be found along a certain stretch of the Mekong in Cambodia
The Mekong basin is one of the richest areas of biodiversity in the world. Only the Amazon boasts a higher level of biodiversity.[2] Biota estimates for the Greater Mekong Subregion (GMS) include 20,000 plant species, 430 mammals, 1,200 birds, 800 reptiles and amphibians[6] and an estimated 850 fish species.[7] In 2009, 145 new species were described from the Mekong Region, comprising 29 fish species previously unknown to science, two new bird species, ten reptiles, five mammals, 96 plants and six new amphibians.[8] The Mekong Region contains 16 WWF Global 200 ecoregions, the greatest concentration of ecoregions in mainland Asia.[2]
No other river is home to so many species of very large fish. The biggest include the giant river carp (Probarbus jullieni), which can grow up to 1.5 metres (4 ft 11 in) and weigh 70 kilograms (150 lb), the Mekong Freshwater Stingray (Himantura chaophraya), which can have a wingspan of up to 4.3 metres (14 ft), the giant pangasius (Pangasius sanitwongsei), Siamese giant carp (Catlocarpio siamensis) and the endemic Mekong giant catfish (Pangasianodon gigas), all three of which can grow up to about 3 metres (9 ft 10 in) in length and weigh 300 kilograms (660 lb). All of these are in serious decline, because of dams, flood control and overfishing.
One species of freshwater dolphin, the Irrawaddy Dolphin (Orcaella brevirostris), was once common in the whole of the Lower Mekong but is now very rare.[9]
Among other wetland mammals that have been living in and around the river are the smooth-coated otter (Lutra perspicillata) and fishing cat (Felis viverrina).
The endangered Siamese crocodile (Crocodylus siamensis) occurs in small isolated pockets within the northern Cambodian and Laotian portions of the Mekong River. The Saltwater crocodile (Crocodylus porosus) once ranged from the Mekong Delta up the river into Tonle Sap and beyond but is now extinct in the river, along with being extinct in all of Vietnam and possibly even Cambodia.

Navigation

For thousands of years the Mekong River has been an important conduit for people and goods between the many towns situated along its banks. Traditional forms of trade in small boats linking communities continue today, however the river is also becoming an important link in international trade routes, connecting the six Mekong countries to each other, and also to the rest of the world.[2] The Mekong is still a wild river and navigation conditions vary greatly along its length. Broadly, navigation of the river is divided between upper and lower Mekong, with the 'upper' part of the river defined as the stretch north of the Khone Falls in southern Laos; and the 'lower' part as the stretch below these falls.
Narrower and more turbulent sections of water in the upstream parts of the Mekong River, coupled with large annual water level variations continue to present a challenge to navigation. The seasonal variations in water level directly affect trade in this section of the river. Volumes of trade being shipped decrease by more than 50 per cent, primarily due to the reduced draughts available during the low water season (June–January).[2] Despite these difficulties, the Mekong River is already an important link in the transit chain between Kunming and Bangkok with about 300,000 tonnes of goods shipped via this route each year.[2] The volume of this trade is expected to increase by 8–11 per cent per year. Port infrastructure is being expanded to accommodate the expected growth in traffic, with new facilities planned for Chiang Saen port.[2]
In Laos, 50 and 100 DWT vessels are primarily operated for regional trade, the main types of cargo carried are timber, agricultural products and construction materials.[2] Thailand imports a wide variety of products from China, including vegetables, fruit, agricultural products and fertilisers. The main exports from Thailand are dried longan, fish oil, rubber products and consumables. Nearly all the ships carrying cargo to and from Chiang Saen Port are 300 DWT Chinese flag vessels.[2]
Waterborne trade in the lower Mekong countries of Vietnam and Cambodia has grown significantly, with trends in container traffic at Phnom Penh port and general cargo through Can Tho port both showing steady increases until 2009 when a decrease in cargo volumes can be attributed to the global financial crisis and a subsequent decline in demand for the export of garments to the US.[2] In 2009, Mekong trade received a significant boost with the opening of a new deep-water port at Cai Mep in Vietnam. This new port has generated a renewed focus on the Mekong River as a trade route. The Cai Mep container terminals can accom- modate vessels with a draught of 15.2 m, equivalent to the largest container ships in the world. These mother vessels sail directly to Europe or the United States, which means that goods can be shipped internationally to and from Phnom Penh with only a single trans-shipment at Cai Mep.[2]
As an international river, a number of agreements exist between the countries that share the Mekong to enable trade and passage between them. The most important of these, which address the full length of the river, are[2]:
  • Agreement between China and Lao PDR on Freight and Passenger Trans- port along the Lancang–Mekong River, adopted in November 1994.
  • Agreement on the Cooperation for the Sustainable Development of the Mekong River Basin, Article 9, Freedom of Navigation, 5 April 1995, Chiang Rai.
  • Hanoi Agreement between Cambodia and Viet Nam on Waterway Transportation, 13 December 1998.
  • Agreement between and among the Governments of the Laos, Thailand, and Vietnam for Facilitation of Cross border Transport of Goods and People, (amended at Yangon, Burma (Myanmar)), signed in Vientiane, 26 November 1999.
  • Agreement on Commercial Navigation on Lancang–Mekong River among the governments of China, Laos, Burma (Myanmar) and Thailand, adopted at Tachileik, 20 April 2000.
  • Phnom Penh Agreement between Cambodia and Vietnam on the Transit of Goods, 7 September 2000.
  • New Agreement on Waterway Transportation between Vietnam and Cambodia, signed in Phnom Penh, 17 December 2009.

Geology

The internal drainage patterns of the Mekong are unusual when compared to those of other large rivers.[2] Most large river systems that drain the interiors of continents, such as the Amazon, Congo, and Mississippi, have relatively simple dendritic tributary networks that resemble a branching tree.[22]
Typically, such patterns develop in basins with gentle slopes where the underlying geological structure is fairly homogenous and stable, exerting little or no control on river morphology.[23] In marked contrast, the tributary networks of the Salween, Yangtze, and particularly the Mekong, are complex with different sub-basins often exhibiting different, and distinct, drainage patterns. These complex drainage systems have developed in a setting where the underlying geological structure is heterogeneous and active, and is the major factor controlling the course of rivers and the landscapes they carve out.[24]

History

A map of 1715, incorrectly showing the Chao Praya river as a branch of the Mekong
The members of the French

Bridges

The Thai–Lao Friendship Bridge (Thai: สะพาน มิตรภาพ ไทย-ลาว Saphan Mittaphap Thai-lao) connects Nong Khai city with Vientiane in Laos. The 1,170-metre (3,840 ft)-long bridge has two 3.5-metre (11 ft)-wide lanes with a single railway line in the middle. On March 20, 2004, the Thai and Lao governments agreed to extend the railway to Tha Nalaeng in Laos, this extension has since been completed.
The Second Thai–Lao Friendship Bridge connects Mukdahan to Savannakhet. The two-lane, 12-metre (39 ft)-wide, 1,600-metre (5,200 ft)-long bridge opened to the general public on January 9, 2007.
There are only three bridges, located in Champasak Province, in Laos. Unlike the Friendship bridges, this bridge is not a border crossing. It is 1,380 metres (4,528 ft) long, and was completed in 2000 (Pakxe bridge 15°6′19.95″N 105°48′49.51″E).
A new bridge over the Mekong is to be completed by 2011, connecting the border towns of Chiang Khong (Thailand) and Ban Houayxay (Laos), as part of Asian Highway 3. The Chinese and Thai governments agreed to build the bridge and share the estimated $33USD million dollar cost of the project.
Another new bridge is to be built at Neak Leung on the Phnom Penh to Ho Chi Minh highway with Japanese government assistance, anticipated to be opened in 2014.
Cambodia has one two-lane bridge, the Kizuna bridge in the city of Kompong Cham, on the road linking Phnom Penh with the remote provinces of Ratanakiri and Mondolkiri, and further away Laos.
The Prek Tamak Bridge, 40 km north of Phnom Penh opened in 2011.
Phnom Penh itself has no bridge under construction yet, although two new bridges have recently opened on the Tonle Sap, and the main bridge on the highway to Ho Chi Minh was duplicated in 2010.
In Vietnam, since the year 2000 My Thuan Bridge (Mỹ Thuận), crosses the first channel—the left, main branch of the Mekong, the Sông Tiền or Tiền Giang—a dozen km ahead of Vinh Long (Vĩnh Long) and since 2008 Rach Mieu Bridge (Rạch Miễu) crosses it a dozen km ahead of de My Tho (Mỹ Tho), between the provinces de Tien Giang (Tiền Giang) and Ben Tre (Bến Tre).
Can Tho Bridge (Cần Thơ), crosses the second channel—the right, main distributary of the Mekong, the Bassac (Song Hau). Inaugurated in 2010, it is the longest main span cable-stayed bridge in Southeast Asia.