The Jinanqiao Dam or Jin'anqiao Dam (, ''meaning "golden and peace bridge"'') is a concrete gravity

dam A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, a ...

on the

Jinsha River The Jinsha River (, Tibetan: Dri Chu, འབྲི་ཆུ) is the Chinese name for the upper stretches of the Yangtze River. It flows through the provinces of Qinghai, Sichuan, and Yunnan in western China. The river passes through Tiger L ...

southeast of

Lijiang City Lijiang (), also known as Likiang, is a prefecture-level city in the northwest of Yunnan Province, China. It has an area of and had a population of 1,253,878 at the 2020 census whom 288,787 lived in the built-up area (metro) made of Gucheng ...

Yunnan Province Yunnan , () is a landlocked province in the southwest of the People's Republic of China. The province spans approximately and has a population of 48.3 million (as of 2018). The capital of the province is Kunming. The province borders the C ...

China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...

. The purpose of the dam is

hydroelectric Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined and ...

power production and flood control.

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 tall and long gravity dam composed of of

roller-compacted concrete Roller-compacted concrete (RCC) or rolled concrete (rollcrete) is a special blend of concrete that has essentially the same ingredients as conventional concrete but in different ratios, and increasingly with partial substitution of fly ash for Po ...

. The dam's crest elevation is above sea level and it withholds a

reservoir A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation. Reservoirs can be created in a number of ways, including contro ...

with a normal storage level of ASL. Of the reservoir's storage, is active or "useful". The dam's

spillway A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure tha ...

consists of five x openings which have a maximum flood discharge capacity of . 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 long, wide and high. Four penstocks with a diameter feed the 4 x 600 MW

Francis turbine The Francis turbine is a type of water turbine. It is an inward-flow reaction turbine that combines radial and axial flow concepts. Francis turbines are the most common water turbine in use today, and can achieve over 95% efficiency. The proces ...

-generators which can discharge up to after generation. Each Francis runner has a 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.

References

{{Yangtze dams , dam=Jinanqiao Dam, downriver=

Longkaikou Dam The Longkaikou Dam is a gravity dam on the Jinsha River in Dali Bai Autonomous Prefecture, Yunnan province, China. The dam has a height of and was constructed with roller-compacted concrete. Construction on the dam began in 2007, the river was div ...

, upriver=

Ahai Dam The Ahai Dam (阿海水电站) is a gravity dam on the Jinsha River in Yulong County, Lijiang Prefecture, Yunnan and in the river reach at about 5 km in the lower reaches of Cuiyu River mouth. Preliminary construction began in 2008 and cons ...

Hydroelectric power stations in Yunnan Dams in China Dams on the Jinsha River Gravity dams Dams completed in 2010 Roller-compacted concrete dams Energy infrastructure completed in 2011 2011 establishments in China Buildings and structures in Lijiang

Construction

Design

See also

References