According to the measured data after impoundment and operation of the Three Gorges Reservoir,the reservoir sediment deposition and downstream river channel scouring are described briefly and compared with the research...According to the measured data after impoundment and operation of the Three Gorges Reservoir,the reservoir sediment deposition and downstream river channel scouring are described briefly and compared with the research results achieved in the demonstration stage.It is indicated through analysis that the reservoir sediment deposition and downstream river channel scouring during 8-year impoundment and operation are still within the original forecast,so the original forecasting results are feasible.The further observation and comparison should be conducted because the comparison between the observed data and the original forecast is not so sufficient in time and the prototype observation and related research work should be strengthened in the future.展开更多
The Three Gorges Project(TGP) on the Yangtze River(YR) is the largest water power station in the world;it is now attracting the worldwide attention. Possessing comprehensive utilization benefits mainly for flood contr...The Three Gorges Project(TGP) on the Yangtze River(YR) is the largest water power station in the world;it is now attracting the worldwide attention. Possessing comprehensive utilization benefits mainly for flood control,power generation and navigation improvement,TGP will be a vital and backbone project in harnessing and developing of the YR. TGP has been commenced in 1993,the main channel of Yangtze was diverted on Nov.8th,1997 and whole project was completed in 2009. The Three Gorges(TG) reservoir has been formed since June 2003 and impounded to 175 m on Oct.26th,2010. The reservoir has a total length of 660 km and an average width of 1.0-1.5 km,with a total waters area of 1048 km2. In pace with the raised pool level,the enlargedstorage,the probability of reservoir earthquake would be enlarged. According to the magnitude records of historical maximum earthquake and properly weighted,defined the maximum reliable earthquake of TG reservoir would be ML6 magnitude,existed the probability of ML 5.0-5.8 induced earthquake around the Xiannvshan and Jiuwanxi fault zone(18 km upstream of the dam) . However,the highest intensity around the dam site would not exceed Degree VI,whereas the main structures of TGP were designed with an anti-seismic intensity of Degree VII,hence the reservoir induced earthquake would not form direct threat to the main structures of TGP. After the impoundment and operation of TG reservoir,the frequency and intensity of earthquake has been increased in some extent,yet the earthquake activities at TG region still kept in an original weak earthquake activities status. We should strengthen the TG reservoir induced earthquake monitoring and forecast,prevent the earthquake and geological calamity,ensure the safety of dam construction and operation,form the harmonious society as well as guarantee the long term security. This paper explained the mechanism,kinds,causes,development and calamities of the earthquakes in the world,collected a lot of TGP,China and World's earthquake and geology materials. Such as 105 year(Jan.1906-June2011) earthquake records in the world(Tab.1) ,13 main reservoir induced earthquake records in China(Tab. 2) ,19 main reservoir induced earthquake records in the world(Tab.3) ,14 year(1996-2009) reservoir earthquake monitoring records in TGP(Tab.4) . Analyzed the cause,calamities of the main earthquakes as well as its alarm and forecast. May it provide reference for readers and beg your guide.展开更多
基金support from the Technology Pillar Program during the"Eleventh Five-year Plan"Period (No.2006BAB05B02No.2006BAB05B03) are acknowledged
文摘According to the measured data after impoundment and operation of the Three Gorges Reservoir,the reservoir sediment deposition and downstream river channel scouring are described briefly and compared with the research results achieved in the demonstration stage.It is indicated through analysis that the reservoir sediment deposition and downstream river channel scouring during 8-year impoundment and operation are still within the original forecast,so the original forecasting results are feasible.The further observation and comparison should be conducted because the comparison between the observed data and the original forecast is not so sufficient in time and the prototype observation and related research work should be strengthened in the future.
文摘The Three Gorges Project(TGP) on the Yangtze River(YR) is the largest water power station in the world;it is now attracting the worldwide attention. Possessing comprehensive utilization benefits mainly for flood control,power generation and navigation improvement,TGP will be a vital and backbone project in harnessing and developing of the YR. TGP has been commenced in 1993,the main channel of Yangtze was diverted on Nov.8th,1997 and whole project was completed in 2009. The Three Gorges(TG) reservoir has been formed since June 2003 and impounded to 175 m on Oct.26th,2010. The reservoir has a total length of 660 km and an average width of 1.0-1.5 km,with a total waters area of 1048 km2. In pace with the raised pool level,the enlargedstorage,the probability of reservoir earthquake would be enlarged. According to the magnitude records of historical maximum earthquake and properly weighted,defined the maximum reliable earthquake of TG reservoir would be ML6 magnitude,existed the probability of ML 5.0-5.8 induced earthquake around the Xiannvshan and Jiuwanxi fault zone(18 km upstream of the dam) . However,the highest intensity around the dam site would not exceed Degree VI,whereas the main structures of TGP were designed with an anti-seismic intensity of Degree VII,hence the reservoir induced earthquake would not form direct threat to the main structures of TGP. After the impoundment and operation of TG reservoir,the frequency and intensity of earthquake has been increased in some extent,yet the earthquake activities at TG region still kept in an original weak earthquake activities status. We should strengthen the TG reservoir induced earthquake monitoring and forecast,prevent the earthquake and geological calamity,ensure the safety of dam construction and operation,form the harmonious society as well as guarantee the long term security. This paper explained the mechanism,kinds,causes,development and calamities of the earthquakes in the world,collected a lot of TGP,China and World's earthquake and geology materials. Such as 105 year(Jan.1906-June2011) earthquake records in the world(Tab.1) ,13 main reservoir induced earthquake records in China(Tab. 2) ,19 main reservoir induced earthquake records in the world(Tab.3) ,14 year(1996-2009) reservoir earthquake monitoring records in TGP(Tab.4) . Analyzed the cause,calamities of the main earthquakes as well as its alarm and forecast. May it provide reference for readers and beg your guide.
