三峡水库蓄水引起的地球自转扰动

本文利用较精细的三峡水库水负荷时空分布模型，模拟了该水库在蓄水阶段和蓄水后，水负荷激发的极移和地球引力位二阶球谐系数的变化。数值结果表明，蓄水过程中极移和δJ2呈现准长期变化，幅值不断增加，在蓄水阶段的2000—2009年，线性回归的极移速率为0.042mas/a，方向为73.6°W，δ2为0.025×10-12a-1，分别是全球其他88个较大型水库引起的准长期效应的8.4%和2.5%。

Effects of Impounding in Three Gorges Reservoir on Earth's Rotation

We utilize a realistic mass distribution model for the augmented water body in Three Gorges Reservoir during the filling period(1998—2009),and investigate the resultant earth's rotation perturbations from 1998 to 2129.The numerical results demonstrate that the polar motion and δJ2 increase nearly linearly as the time between 2000 and 2009,the linearly-regressed polar motion rate is 0.042 mas/a towards73.6°W and δ2 0.025×10-12a-1.These two values are respectively 8.4% and 2.5% of the quasi-secular effects of other 88 large reservoirs in the world.