Deformation in the Three Gorges Reservoir after the first impoundment determined by GPS measurements  

作　　者：DURuilin QIAOXuejun WANGQi XINGCanfei YOUXinzhao 

机构地区：[1]InstituteofSeismology,CEA,Wuhan430071,China／／LaboratoryofCrustalMovementandEarthObservation,Wuhan430071,China [2]InstituteofSeismology,CEA,Wuhan430071,China／／CenterforAnalysisandPrediction,CEA,Beijing100036,China

出　　处：《Progress in Natural Science:Materials International》2005年第6期515-522,共8页自然科学进展·国际材料（英文版）

基　　金：SupportedbyNationalNaturalScienceFoundationofChina(GrantNos.40274007and40304002),SeismologicalUnionFundofChineseSeismologicalBureau(103030,602015),theMinistryofScienceandTechnologyofChinaandtheSpecialFundofThreeGorgesProjectExploitingCorporation

摘　　要：A 6-year long GPS observation (1998—2003) indicates that crustal deformation in the Three Gorges area is less active at a marginally measurable rate of 0—5 mm/a relative to stable South China block. However, the impounding water in June 2003 has induced transient displacement at the Three Gorges dam and the emerging reservoir. GPS measurements after the first stage of water filling of the reservoir demonstrate that vertical subsidence close by Yangtze River is about 10—40 mm, and the horizontal displacement is less than 5—10 mm. The maximum subsidence induced by the impoundment is located in the segment of the reservoir from Maoping to Xiangxi. The water loading-induced deformation diminishes rapidly with the distance from banks of the reservoir. The overall pattern of transient deformation is consistent with the simulation result of Farrell, and is attributed to the elastic response of upper lithosphere crust to overlying water reservoir.A 6-year long GPS observation (1998-2003) indicates that crustal deformation in the Three Gorges area is less active at a marginally measurable rate of 0-5 mm/a relative to stable South China block. However, the impounding water in June 2003 has induced transient displacement at the Three Gorges dam and the emerging reservoir. GPS measurements after the first stage of water filling of the reservoir demonstrate that vertical subsidence close by Yangtze River is about 10-40 mm, and the horizontal displacement is less than 5-10 mm. The maximum subsidence induced by the impoundment is located in the segment of the reservoir from Maoping to Xiangxi. The water loading-induced deformation diminishes rapidly with the distance from banks of the reservoir. The overall pattern of transient deformation is consistent with the simulation result of Farrell, and is attributed to the elastic response of upper lithosphere crust to overlying water reservoir.

关 键 词：Three Gorges GPS IMPOUNDMENT DEFORMATION 

分 类 号：TV64[水利工程—水利水电工程]