The Lhasa River, also called Kyi Chu (, ), is a northern tributary of the
Yarlung Tsangpo River
The Yarlung Tsangpo, also called Yarlung Zangbo () is the upper stream of the Brahmaputra River located in the Tibet Autonomous Region, China. It is the longest river of Tibet and the fifth longest in China. The upper section is also called D ...
in the south of the
Tibet Autonomous Region
The Tibet Autonomous Region or Xizang Autonomous Region, often shortened to Tibet or Xizang, is a province-level autonomous region of the People's Republic of China in Southwest China. It was overlayed on the traditional Tibetan regions of à ...
of China.
The Yarlung Tsangpo is the upper section of the
Brahmaputra River. The Lhasa River is subject to flooding with the summer monsoon rains, and structures have been built to control the floods.
In its lower reaches the river valley is an important agricultural area. The city of
Lhasa
Lhasa (; Lhasa dialect: ; bo, text=ལྷ་ས, translation=Place of Gods) is the urban center of the prefecture-level Lhasa City and the administrative capital of Tibet Autonomous Region in Southwest China. The inner urban area of Lhas ...
, named after the river, lies on the river. There are two large hydroelectric power stations on the river, the Zhikong Hydro Power Station (100 MW) and the
Pangduo Hydro Power Station (160 MW)
Basin
The Lhasa River drains an area of , and is the largest tributary of the middle section of the
Yaluzangbu River.
The average altitude of the basin is around .
The basin has complex geology and is tectonically active. Earthquakes are common.
The river basin is the center of Tibet politically, economically and culturally.
As of 1990 the population was 329,700, of whom 208,700 were farmers. 88% of the people were ethnic Tibetans.
The climate is semi-arid monsoon, with a low average temperature of .
Average annual precipitation is , with 85% falling in the June–September period.
Annual runoff is .
Water quality is good, with little discharge of sewage and minimal chemical pesticides and fertilizers.
The basin has about of farmland, of which is irrigated.
There are of grasslands that may be used for pasturage, and of forest.
Course
The Lhasa River is the longest of the Yarlung Tsangpo tributaries.
It flows through the south of the
Tibet Autonomous Region
The Tibet Autonomous Region or Xizang Autonomous Region, often shortened to Tibet or Xizang, is a province-level autonomous region of the People's Republic of China in Southwest China. It was overlayed on the traditional Tibetan regions of à ...
of China, and is a left tributary of the Yarlung Tsangpo.
It is about long.
The river forms where three smaller rivers converge.
These are the Phak Chu, the Phongdolha Chu which flows from
Damxung County
Damxung is a county of Lhasa City, lying to the north of its main center of Chengguan, in the Tibet Autonomous Region of the People's Republic of China. Its administrative seat is Damquka. The terrain is rugged, including the western Nyenchen ...
and the
Reting Tsangpo
The Reting Tsangpo () is a river in the Tibet Autonomous Region of China. It is the main headwater of the Lhasa River.
The river flows past Reting Monastery, founded in 1056. The terrain is geologically complex, with deeply eroded and faulted roc ...
, which rises beyond the
Reting Monastery
Reting Monastery () is an historically important Buddhist monastery in Lhünzhub County in Lhasa, Ü-Tsang, Tibet. It is also commonly spelled "Radreng."
History
Reting Monastery was founded by Atiśa's chief disciple Dromtön in 1057 in t ...
.
The highest tributary rises at around on the southern slope of the
Nyenchen Tanglha Mountains
The Nyenchen Tanglha Mountains (officially spelt Nyainqêntanglha Mountains in Chinese) are a long mountain range, and subrange of the Transhimalaya System, located in Tibet and the Tibet Autonomous Region of China.
Geography
One source ...
.
In its upper reaches the river flows southeast through a deep valley.
Lower down the river valley is flatter and changes its direction to the southwest, The river expands to a width of .
Major tributaries in the lower reaches include the
Pengbo River and the
Duilong River.
At its mouth the Lhasa Valley is about wide.
It enters the Tsangpo at a point where that river makes a sharp turn to the south, and which therefore seems to be a continuation of the Lhasa River.
The river is navigable from its mouth on the Yarlung Tsangpo up to the city of
Lhasa
Lhasa (; Lhasa dialect: ; bo, text=ལྷ་ས, translation=Place of Gods) is the urban center of the prefecture-level Lhasa City and the administrative capital of Tibet Autonomous Region in Southwest China. The inner urban area of Lhas ...
and to altitudes of up to .
Intensive melting of snow and glaciers starts in May, contributing 20–30% of the water.
The bulk of the water is supplied by the summer monsoon rains, which fall from July to September.
There are floods in the summer from July to September, with about 17% of the annual runoff flowing in September.
In winter the river has low water, and sometimes freezes. Total flow is about , with average flow about .
Fish population
The Lhasa River has mean monthly water temperatures that range from about .
Average water temperatures are .
There are abundant species of fish that are adapted to the clear and cool water.
The cool temperatures, with the upstream reaches above freezing over at times, has the effect of delaying growth of fish such as ''
Oxygymnocypris stewartii''.
The Tibetan plateau has thin air and clouds, which combined with the clear water gives strong illumination from a full moon.
This may affect the fishes' circadian rhythm.
In 2009 it was reported that fish caught in the lower reaches of the river had been decreasing slightly in size, probably due to increasing demand and construction of hydroelectric dams.
Settlements
![Bundesarchiv Bild 135-S-16-03-11, Tibetexpedition, Lhasa, Potala von Osten](https://upload.wikimedia.org/wikipedia/commons/c/ca/Bundesarchiv_Bild_135-S-16-03-11%2C_Tibetexpedition%2C_Lhasa%2C_Potala_von_Osten.jpg)
The river valley is one of the main agricultural areas of Tibet.
The city of Lhasa lies on its shore, and there are many Buddhist monasteries in the valley.
Riwo Ganden Nampar Gyelpé Ling, the first fortress of the Gelukpa sect, was built on the left bank in 1409, about upstream from Lhasa.
In 1416 the monastery of Chödra Chenpo Penden Drepung was built on the right bank near to the Neudzong fortress.
The ruins of the Sne'u rdzong fortress are on the left bank of the river, opposite the
Norbulingka
Norbulingka ( bo, ནོར་བུ་གླིང་ཀ་; Wylie: ''Nor-bu-gling-ka''; ; literally "Jeweled Park") is a palace and surrounding park in Lhasa, Tibet, built from 1755.Tibet (1986), p.71 It served as the traditional summer resid ...
summer palace of the Dalai Lamas in Lhasa.
The climate in the central river valleys of Tibet is comparatively mild.
They are warm in summer, and even in the coldest months of winter the temperature is above freezing on sunny days.
A visitor described the valley around Lhasa in 1889 as follows,
William Montgomery McGovern
William Montgomery McGovern (September 28, 1897 – December 12, 1964) was an American adventurer, political scientist, Northwestern University professor, anthropologist and journalist. He was a possible inspiration for the character of Indiana Jon ...
wrote in ''To Lhasa in Disguise'' (1924) that the right tributary of the Lhasa River, the Ti, which enters the river a few miles below Lhasa, was crossed by a very large and imposing bridge over a hundred yards long, with masonry piers and substantial stone embankments.
McGovern also described the Yutok-sampa, or Turquoise Bridge, a structure with walls and a roof that crossed what had been the main Lhasa River but was now a stagnant canal.
As late as 1984 ''kowas'', yak hide boats similar to coracles, were being used to ferry passengers across the Lhasa River.
The
Liuwu Bridge
The Liuwu Bridge (} crosses the Lhasa River linking downtown Lhasa, Tibet to Lhasa railway station
Lhasa railway station (, ) is a railway station in Lhasa, Tibet Autonomous Region, China.
Location
The railway station lies in Niu New Area, Doil ...
was constructed across the Lhasa River to link central Lhasa to
Lhasa railway station
Lhasa railway station (, ) is a railway station in Lhasa, Tibet Autonomous Region, China.
Location
The railway station lies in Niu New Area, Doilungdêqên District, 1 kilometer to the south of the Lhasa River and 5 kilometers southwest of the ...
on the south bank.
The bridge was completed in 2007.
In 2010 there was a small hydroelectric power station.
Prior to 2011, waste water from Lhasa was discharged untreated into the river.
A waste water treatment plant designed to process 50,000 tons of sewage per day was commissioned in July 2011.
Barrages
Before the
Annexation of Tibet by the People's Republic of China
Tibet came under the control of People's Republic of China (PRC) after the Government of Tibet signed the Seventeen Point Agreement which the 14th Dalai Lama ratified on 24 October 1951, but later repudiated on the grounds that he rendered his ...
, the agricultural engineer
Peter Aufschnaiter
Peter Aufschnaiter (2 November 1899 – 12 October 1973) was an Austrian mountaineer, agricultural scientist, geographer and cartographer. His experiences with fellow climber Heinrich Harrer during World War II were depicted in the 1997 film ' ...
designed a dam on the Lhasa River to protect the palace of Norbulingka in the city of
Lhasa
Lhasa (; Lhasa dialect: ; bo, text=ལྷ་ས, translation=Place of Gods) is the urban center of the prefecture-level Lhasa City and the administrative capital of Tibet Autonomous Region in Southwest China. The inner urban area of Lhas ...
from flooding, with a water supply canal to the city.
Heinrich Harrer
Heinrich Harrer (; 6 July 1912 – 7 January 2006) was an Austrian mountaineer, sportsman, geographer, ''Oberscharführer'' in the ''Schutzstaffel'' (SS), and author. He was a member of the four-man climbing team that made the first ascent of th ...
monitored the work.
In 1948 Heinrich Harrer had to intervene to reinforce a dyke that protected the Norbulingka from inundations by the Lhasa River, which was wide after the monsoon.
Harrer directed a work crew of 500 soldiers and 1,000 laborers paid by the government of Tibet.
A fleet of 40
Yak skin boats were used to carry granite blocks extracted from a quarry upstream of the Norbulingka.
Harrer mentions some difficulties.
The Tibetans did not work as hard as westerners, and would stop to help worms when they found them. There were several hundred women working on the site.
The soldiers did not fail to make jokes with them, to which they responded promptly.
The site was often visited by members of the Tibetan government, who would give out silk scarves, and rewards were distributed to the workers.
The total hydropower potential of the river basin is 2,560,000 kW.
83 medium and small hydroelectric plants had been built by 1989, delivering a total of 26,124 kW.
Construction of the
Zhikong Hydro Power Station
The Zhikong Hydro Power Station (), is a reservoir and power station on the Lhasa River in Maizhokunggar County to the east of Lhasa, Tibet, China.
It came into operation in 2007, and has a capacity of 100 MW.
Description
The Zhikong Hydro ...
in
Maizhokunggar County
Maizhokunggar County or Meldro Gungkar County is a county of Lhasa and east of the main center of Chengguan, Tibet Autonomous Region. It has an area of with an average elevation of over . Most of the people are ethnic Tibetan and are engaged i ...
began in May 2003.
The reservoir is at an elevation of above sea level.
The project cost 1.37 billion yuan. The dam impounds of water. The 100 MW power station came into operation in September 2007.
The
Pondo Water-Control Project dammed the Lhasa River in
Lhünzhub County
Lhünzhub County, also called Lhundrub or Linzhou County, is a county in Lhasa towards the north-east of the main center of Chengguan, Tibet, China.
It covers an area of and as of 2000 had a population of 50,895 people, almost all classified a ...
. Work started in 2008, and progressed on schedule.
It is at an elevation of above sea level.
The project includes a reservoir and a power station with potential annual generating capacity of 599 million kilowatt hours.
The project, also called the Pangduo hydro project, impounds of water.
It is planned to irrigate .
Damming of the river stream was completed in October 2011.
The project was due to start operating its first generator in October 2013.
The project involved a total investment of 4.569 billion yuan, or about 0.74 billion US dollars, and has been called the "Tibetan Three Gorges". It was built as part of the Western Development Strategy. The dam also supports flood prevention and water supply.
File:Dazi Bridge-1.jpg, Dazi Bridge
The Dazi Bridge is a one-lane suspension bridge in Dagzê, Tibet. At the time of its completion in 1984, it was the longest spanning bridge in China with a main span of . The bridge crosses the Lhasa River east of Lhasa.
Structure
The bridge ...
in Dagzê, completed in 1984
File:Tibet-6081 - View Large (2694777213).jpg, The flat river valley (2006)
File:Lhasa, Tibet.jpg, View from the air of the river running to the south of the city of Lhasa (2009)
File:Tibet-6080 (2695594944).jpg, Lhasa River to the south of Lhasa (2008)
References
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{{Authority control
Rivers of Lhasa
Tributaries of the Brahmaputra River
Braided rivers in China