Jinanqiao Dam

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Jinanqiao Dam
Jinanqiao Dam is located in China
Jinanqiao Dam
Location of Jinanqiao Dam
Country China
Location Lijiang City in Yunnan Province
Coordinates 26°48′32″N 100°26′45″E / 26.80889°N 100.44583°E / 26.80889; 100.44583Coordinates: 26°48′32″N 100°26′45″E / 26.80889°N 100.44583°E / 26.80889; 100.44583
Status In use
Construction began 2003
Opening date 2010
Dam and spillways
Type of dam Gravity
Impounds Jinsha River
Height 160 m (525 ft)
Length 640 m (2,100 ft)
Dam volume 3,920,000 m3 (138,433,494 cu ft)
Spillways 5
Spillway type Service, crest openings
Spillway capacity 14,980 m3/s (529,014 cu ft/s)
Reservoir
Creates Jinanqiao Reservoir
Total capacity 847,000,000 m3 (686,674 acre·ft)
Catchment area 237,400 km2 (91,661 sq mi)
Power station
Commission date 2010-2011
Hydraulic head 111 m (364 ft) (max.)
Turbines 4 x 600 MW Francis turbines
Installed capacity 2,400 MW

The Jinanqiao Dam or Jin'anqiao (meaning "golden and peace bridge"[1]) is a concrete gravity dam on the Jinsha River 25 km (16 mi) southeast of Lijiang City in Yunnan Province, China. The purpose of the dam is hydroelectric power production and flood control.

Construction[edit]

The Jinanqiao project was approved in August 2003 and construction began in 2005. By December of that year, the river was diverted and the construction of the actual dam began in January 2006. By February 2007, the foundation had been excavated and concrete pouring began. In June 2010, the dam's first generator was operational, the last was commissioned in 2011.[2]

Design[edit]

The dam is a 160 m (525 ft) tall and 640 m (2,100 ft) long gravity dam composed of 3,920,000 m3 (138,433,494 cu ft) of roller-compacted concrete. The dam's crest elevation is 1,424 m3 (50,288 cu ft) above sea level and it withholds a 847,000,000 m3 (686,674 acre·ft) reservoir with a normal storage level of 1,418 m (4,652 ft) ASL. Of the reservoir's storage, 313,000,000 m3 (253,753 acre·ft) is active or "useful". The dam's spillway consists of five 13 m (43 ft) x 20 m (66 ft) openings which have a maximum flood discharge capacity of 14,980 m3/s (529,014 cu ft/s). To prevent scouring, the dam has a stilling basin at the foot of the spillway. The dam's power station sits at its toe and adjacent to the spillway. It is 213 m (699 ft) long, 34 m (112 ft) wide and 79.2 m (260 ft) high. Four penstocks with a 10.5 m (34 ft) diameter feed the 4 x 600 MW Francis turbine-generators which can discharge up to 605 m3/s (21,365 cu ft/s) after generation. Each Francis runner has a 6 m (20 ft) diameter.[2]

Because of high seismic activity in the area of the dam, special care was taken during design and construction to prepare the joints and foundation for sliding and tensile stress. Earthquake-resistant steel bars were installed in high-tensile areas, the construction joint was reduced to 2/3 its size and filled with non-woven fabrics along with the incorporation of a grouted joint between the dam and power plant.[2]

See also[edit]

References[edit]

  1. ^ "Trip to the Jinanqiao dam site 2009". International Probe. Retrieved 9 January 2011. 
  2. ^ a b c Cheng-Bin Du, Yong-Wen Hong (Feature Building Jinanqiao Dam 29 November 2010). "Building Jinanqiao Dam". International Water Power and Dam Construction. Retrieved 9 January 2011.