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Jinping-II Dam

Field	Value
name	Jinping-II Dam
name_official	Jinping-II Hydropower Station
dam_crosses	Yalong River
location	Yanyuan County and Muli Tibetan Autonomous County, Sichuan, China
dam_length	162 m
dam_height	37 m
construction_began	2007
opening	2014
status	O
purpose	Power
owner	Yalong River Hydropower Development Company, Ltd.
operator	MWREP
res_name	Jinping-II Reservoir
res_capacity_total	14280000 m3
res_capacity_active	5020000 m3
res_catchment	102663 km2
plant_turbines	8 × 600 MW Francis-type
plant_capacity	4,800 MW
plant_hydraulic_head	310 m
plant_commission	2012–2014
location_map	China Sichuan#China
coordinates
plant_name	Jinping-II Hydropower Station
plant_coordinates

The Jinping-II Dam (), also known as the Jinping-II Hydropower Station, is a gravity dam on the Jinping Bend of the Yalong River (Yalong Jiang) in Sichuan, China. Construction on the project began in 2007 and it was complete in 2014. Its hydroelectric power station has a 4,800 MW installed capacity.

While Jinping-I relies on a conventional tall dam and large reservoir to supply water, Jinping-II uses a much smaller dam, located 7.5 km downstream of Jinping-I, to divert water into four 16.6 km long headrace tunnels. These tunnels connect to a downstream point on the same river at a much lower elevation, providing a 310 m head of water without flooding a large area of land.

History

Harnessing hydropower on the Jinping Bend of the Yalong River has been in planning for decades. The river makes a hairpin bend 150 km long around the Jinping Mountains, but the downstream part of the river on the opposite side of the mountain is separated by only 16 km. In that distance, there is an elevation drop of 310 m, creating an excellent situation for hydroelectricity production. Two projects were planned for the bend, the Jinping I and Jinping II with a combined capacity of 8,400 MW. Planning for the projects began in the 1960s under the former Sichuan and Shanghai design institutes along with the Ministry of Water Resources and Electric Power. They produced the "Reinvestigation Report on The Yalong River bend (Jinping)". In July 1965, the Jinping Hydropower Engineering Headquarters was set up and designs for the Jinping 1 and Jinping 2 would progress with the East China Investigation and Design Institute .

Construction on the Jinping-II started on January 30, 2007. The dam's first generator was commissioned in December 2012, the second in January 2013. The fifth generator went online in May 2014 and the seventh in October 2014. Jinping-I was fully commissioned by July 2014 and the eighth and final generator for Jinping-II was commissioned on 26 November 2014.

Characteristics

A 37 m tall, 162 m long sluice dam on the west-side of the Jinping bend diverts water into four 16.6 km long headrace tunnels towards the power station. At the power station, the water turns eight 600 MW Francis turbines with a total capacity of 4800 MW before being discharged back into the river.

About 30% of the power from the Jinping dams is used locally, and 70% will be sent to eastern China via ±800 kV bipolar HVDC transmission lines.

In addition to the four headrace tunnels, two roadway tunnels (A and B) were constructed with a diameter of 6 m, and a drainage tunnel 7.2 m in diameter. These were all constructed by drilling and blasting, as were headrace tunnels #2 and #4, with a diameter of 13 m. Headrace tunnels #1 and #3, with a diameter of 12.4 m, were excavated by tunnel boring machine.

References

(August 2010). "Jinping hydropower project: main technical issues on engineering geology and rock mechanics". Bulletin of Engineering Geology and the Environment.
[https://archive.today/20120730222342/http://img24.imageshack.us/i/jinpingmapdreamzb7.jpg/ The Big River Bend and The "Jinping Dream"]
link. (2007-01-30). Xinhua
link. 591hx. (3 May 2013)
link. Caixin Media. (15 May 2014)
link. Sina Finance. (31 October 2014)
""West to East" backbone project Jinping Power All units put into operation". 26 November 2014.
(30 March 2010). "Jinping hydropower project: main technical issues on engineering geology and rock mechanics". Bulletin of Engineering Geology and the Environment.
(25 December 2011). "Rock mechanical problems and optimization for the long and deep diversion tunnels at Jinping II hydropower station". Journal of Rock Mechanics and Geotechnical Engineering.

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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