Country China Opening date 2010 Impounds Jinsha River Catchment area 237,400 km² Impound Jinsha River | Status In use Type of dam Gravity Height 160 m Construction began 2003 Spillway 5 | |
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Location Lijiang City in Yunnan Province Similar Ludila Dam, Shuangjiangkou Dam, Laxiwa Dam | ||
The Jinanqiao Dam or Jin'anqiao (meaning "golden and peace bridge") 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.
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Construction
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.
Design
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.
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.