Ahai Dam

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Ahai Dam
Ahai Dam is located in China
Ahai Dam
Location of Ahai Dam
Location Yulong County, Lijiang, Yunnan
Coordinates 27°21′02″N 100°30′23″E / 27.35056°N 100.50639°E / 27.35056; 100.50639Coordinates: 27°21′02″N 100°30′23″E / 27.35056°N 100.50639°E / 27.35056; 100.50639
Status Operational
Construction began 2008
Opening date 2013
Construction cost 13.6 billion RMB ($2 billion USD)
Dam and spillways
Type of dam Gravity
Impounds Jinsha River
Height 130 m (430 ft)
Reservoir
Creates Ahai Reservoir
Total capacity 8,820,000,000 m3 (7,150,000 acre·ft)
Surface area 23.42 km2 (9.04 sq mi)
Power station
Commission date 2012-2014
Turbines 5 x 400 MW Francis-type
Installed capacity 2,000 MW
Annual generation 8.887 billion kWh (est.)

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 construction on the dam superstructure and power station began in 2010. The dams first generator was operational in December 2012, the third by May 2013.[1][2] The fifth and final generator was commissioned on 9 June 2014.[3]

Background[edit]

The dam section is a transverse valley with a water surface 60 to 150 m wide and low water level of 1048 m. The landforms on both banks are basically symmetrical. There is a measurement of about 50 m wide tableland and about 30 degrees above water surface in the left bank, and the slope in the right bank is about 27 degree and the slope above the elevation of 1500 m is about 48 degree. There is poor sand and soil materials and abundant limestone material satisfied with requirement of quality and reserves within 20 km in the dam area, which is qualified for setting up low dam according to existing geological data. In the light of topographic and geological conditions, the Ahai dam section can be considered as local material dam type with low height of swell, suitable for connection of backwater with Liyuan cascade. The dam has normal water level of 1514 m, total reservoir capacity of 1.08 billion cubic meters and installed capacity of 2,000,000-2,200,000 kW. Now, a low-cost road to Niukexu has been opened to traffic, and there is only an about 5 km long path to the dam section.[4][5]

Environmental impact[edit]

This project marked the first time representatives from Chinese environmental groups were invited to participate in the environmental impact assessment for a major hydropower project in China, according to the First Financial Daily. Ma Jun, director of the Institute for Public & Environmental Affairs, and Yang Yong, representative for the Green Earth Volunteers, took part in the meeting to conduct technical evaluation on environmental impact assessment for the Ahai Dam on the Jingsha River on December 29–30, 2008 in Beijing.

One expert[who?] at the meeting noted that major preliminary work on the dam had begun prior to completion of the environmental impact assessment – a violation of the 2002 Environmental Impact Assessment Law (EIA Law). However, the civil society representatives said that “in terms of procedural fairness, this a major stride towards fulfilling the public participation principles of the EIA Law, a historical improvement.” But the issue of work beginning prior to completion of the EIA is considered the most problematic. Environmentalists are concerned in particular about the dam’s impacts on various local fish species. Green Earth Volunteers director, Wang Yongchen, noted that much more could have been done to reduce harm to biodiversity and local people if the EIA on the dam had been conducted before work had begun on the project.[6]

See also[edit]

References[edit]

  1. ^ "Ahai Station Unit 1 through 72 hours test run (info)" (in Chinese). China Energy Report. 24 December 2012. Retrieved 24 June 2013. 
  2. ^ "Huadian Power Station 3 # Unit Ahai enter 72 hours test run" (in Chinese). Polaris Power News. 14 May 2013. Retrieved 24 June 2013. 
  3. ^ "Jinsha River Basin Hydropower 5 Ahai all production units" (in Chinese). Yunnan Network. 9 June 2014. Retrieved 21 July 2014. 
  4. ^ lijiang.com.cn/english/investment/water
  5. ^ "Ahai Station" (in Chinese). Baidu. Retrieved 9 January 2011. 
  6. ^ greenlaw.org.cn/enblog