Re: China quake
Re: China quake
Hydropower development over very, very dangerous: Zipingpu Reservoir may trigger large earthquakes ?
(Boxun - June 6, 2008 reprint)
Source: Asian Weekly
Cheung Ping / Zipingpu dam area there evoked the basic conditions for the earthquake in 2006, experts believe that the region will be the next big earthquake (7.5 or so) of the centre. Government economic benefits Dajian for power plants, without taking into account the risk of geological disasters, resulting in excessive Sichuan hydropower development is very, very dangerous. (Boxun.
Figure from the aerial view Zipingpu Reservoir, the water covering the vast Wenchuan Yingxiuwan Dujiangyan to the town of the region as a whole. 156 m high dam is located in Dujiangyan and Wenchuan County at the junction of 2001, built from the beginning, as it is _ ?Yu z the geological structure of the controversial. May 12, 2008, surprise attack Wenchuan 8 earthquake, the epicenter Yingxiuwan Firstly Zipingpu Reservoir in the town of precisely the Ku Wei. Only less than two years of the completion of this hydropower station, was again pushed to the dangerous situation and questioned the outlet Langjian.
May 13, the Xinhua News Agency reported that the Zipingpu water conservancy project panel cracks in the dam, plant and other buildings in wall collapse, all power station unit shutdown. For a time, rumors everywhere: "Chengdu not retain his job? "" If the dam collapse, the Chengdu Plain will be drowned! "As Zipingpu Reservoir total capacity of 1.126 billion cubic meters, 877 meters above sea level normal water level , Higher than the ground exactly 377 meters in Chengdu, Chengdu has just experienced the earthquake people heard that this dangerous situation, immediately tense up.
Water experts rushed to the first time. May 14 afternoon, the Ministry of Water Resources Vice Minister Jiao Yong Zipingpu dam in the earthquake relief command post set up at the scene. After a series of rescue work and consultations, the Ministry of Water Resources issued a circular to confirm the dam safety, the relief of panic. However, the dam despite千疮百孔bear to live 8 earthquake, but once again trigger question: such a large-scale water conservancy projects, why would put the site in the earthquake ? If damage to the dam collapsed, the lower reaches 10 million population faced the enormous flood risk Who can bear ? Such large-scale reservoirs, and on whether there would be deep geological impact ?
The total installed capacity of 760,000 kilowatts of Zipingpu Hydropower Station was built in March 2001, was China's "western development" the first batch of one of the 10 landmark projects, as "the Sichuan Provincial No. 1 Project" , When Zhou Yongkang, secretary of the Sichuan Provincial CPC Committee personally cut the ribbon started. October 2006, the completion of the dam, the completion of water storage. But since the establishment, on the Zipingpu faces from both inside and outside the various disputes.
2003, Sichuan Bureau of Geology and Mineral Resources of the opposition had called for FAN Xiao high-risk areas in the geological reservoir construction. February 06, senior engineer Li Youcai Seismological Bureau of Sichuan Province and Sichuan Province Bureau of Geology and Mineral Resources, Senior Engineer Battalion geophysical Cao Shu-ling -? S said: December 1989 from the State Seismological Bureau of the Zipingpu Reservoir Project intensity of the basic conclusions of the review report of the number of errors.
Dam project area report that the earthquake intensity of not more than seven times, Zipingpu dam area is a basic stability of the crust District ?? Li Youcai and Caoshu _? G a study that "the region's seismic intensity is not basic 7.30 , But should be 9 degrees, nine degrees or above; addition, the dam project area is not the basic stability of the earth's crust, but should be the basic unstable region. " They also pointed out that the Zipingpu dam area and its surrounding areas is in a deep three groups of active faults convergence of positions, most underground rock crusher, crustal structure extremely unstable.
According to the late geologist Li Siguang Geological mechanics theory, such a convergence of the earthquake site is the best place to gather stress. "Once the water storage dam area, is likely to induce the dam area and its vicinity are孕育the earthquake." 06 of their bold prediction: Zipingpu dam area and its surrounding areas should be the next big earthquake (about 7.5) Central location. The phrase into prophecies.
Longmenshan built in the earthquake into the reservoir and seismic What is the relationship, this is a complex scientific issues, not emotional or rumors can muddle. But undoubtedly, water conservancy project site in enormous cost of geological disasters in the region, it is necessary to review. The Asian Weekly has an exclusive interview with the Sichuan Geological Survey for more than 20 years experience in the development of excessive running water and electricity for many years of Sichuan Bureau of Geology and Mineral Resources regional geological survey team chief engineer FAN Xiao, the following is a summary of an interview:
Wenchuan earthquake, the Zipingpu Reservoir to bring any kind of danger ?
Earthquake in mountain canyons, very steep slope, has always been areas of geological disasters, itself in a precarious state, coupled with the seismic activity zone, which _? A risk of very high quality. But now there are more than eight Zipingpu Reservoir, the upper reaches of the reservoir as long as a break on the possible chain reaction. The lower reaches have formed the Yanse Hu might have been destroyed.
Earthquake upper reaches of the Minjiang River where the total number of a hydropower station ?
The upper reaches of the Minjiang River on the main stream of a total of nine large-scale hydropower stations. In addition to Yingxiuwan Power Station and Pacific Station power plant, these hydropower stations are concentrated in the years 2001 to 2006 that the construction. Tributaries of the approximately 19 power plants. These are also large, 100,000 kilowatts or more. More small hydropower stations on the.
Why in 2000 after becoming the climax of the southwest hydropower development ?
Many large power station was built after 2000, these hydropower development in Sichuan, southwest of the Three Gorges total of 10 times. According to the Ministry of Water Resources figures, the entire reservoir of Sichuan has more than 6,000, not including the countless small. Small hydropower stations that are strictly legal, but approval may be local government, large-scale hydropower stations will have to the State Council and the State Development and Reform Commission to grant. It is clear the benefits of hydropower station, about a 200,000 kilowatt power plant, an annual payment of taxes Sanyisanqian more than 10,000 yuan (about 47 million U.S. dollars), 6 million kilowatts of tax revenue can be turned over to dozens of billion to hundreds of Billion, from the interest of the Government is willing to promote. But it would environment, geological what kind of impact incalculable. This is such an earthquake, and the Zipingpu What is the relationship between power plants, a cause for concern.
Do you mean that there may be reservoir induced earthquake ?
This time the real epicenter was in Yingxiuwan, if the Zipingpu water level so high, then the Ku Wei in the reservoir. The entire reservoir of the dam area, the water level in the fault zone on the whole, it has all the reservoir induced seismicity, but also evoked relatively strong earthquake conditions. First, before this place had a history of earthquakes, but not as high as magnitude. In addition, the Zipingpu Reservoir precisely the location of the fault zone in the Longmenshan, a seismic zone activities of the mold. There is reservoir scale. The reservoir rock itself is broken, water infiltration may be down to the very site of the earthquake fault zone will play a role in lubrication, the equivalent of friction.
Since height of 156 meters, the higher the dam, the deep water, the water unit area the greater the pressure, the impact of the earthquake magnitude greater. These basic conditions are available. If the quake would not necessarily Zipingpu Reservoir, but it would not be such a high magnitude, epicenter will be in this position _? N hard to say. Because it is likely the water-induced earthquake, it's location, and magnitude change.
Zipingpu Reservoir construction time, these factors have to assess it ?
Water Resources and Hydropower Academy of Sciences should be a reservoir induced earthquake assessment. The project built in 2001 when many people opposed, including the Ministry of Construction, State Environmental Protection Administration, Ministry of Forestry, the State Administration of cultural relics. However, the government must go all out from a policy perspective, the great western development is a key project, from the political Taidao its high position, but it did not fully consider the underlying risk of geological disasters. Hydropower developers to consider only the interests of course, but the Government must consider the overall efficiency, ecology, environment, geology, can not be built on dangerous place. So as to achieve a more reasonable state, reducing many unnecessary losses.
Sichuan hydropower development in the state ?
Development is certainly excessive, very excessive. The so-called excessive to say, an inch of water is left off, some parts of the power plant, a dam and then one of the Three Gorges is the situation. At the junction of Yunnan and Sichuan, is very earthquake-prone zone, one linked to a hydropower station, there is no guarantee that the already devastating after the devastating earthquake there, in so doing, we called the "fuel" too dangerous. _ (Net reproduced) (Boxun.com)
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