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利用22个月的GRACE时变重力场,反演了三峡水库补给水系的水储量变化,并按月给出了数值结果.与水文学同化模型(CPC)的两组比较说明基于GRACE重力的反演结果是合理的.当高斯平均半径为1000km时,该区总水储量变化的峰谷差为14cm,其年变化振幅为5.8cm,相位为-40.8天,与CPC模型合成重力数据的反演结果进行比较,其总水储量变化均方差为1.3cm,年变化振幅相差0.1cm,相位相差1.0天.为进一步检验GRACE能否监测该区真实水储量变化,还将其反演结果与CPC模型的真实平均结果进行比较,结果发现总体均方差为2.1cm,年变化振幅相差1.7cm,相位相差9.3天.因此,第一种比较过高地估计了GRACE监测该区水储量变化的能力,第二种比较则较真实地反映了实际情况,尽管反演结果与水文学的结果差别较大,但仍然显示GRACE能监测该区每月的水储量变化.
Using 22-month GRACE time-varying gravitational field, the water reserves of the Three Gorges reservoir recharge water system are inverted and the numerical results are given on a monthly basis.The comparison of the two models with the Hydrological Assimilation Model (CPC) When the Gaussian average radius is 1000km, the peak-to-valley difference of the total water storage change is 14cm, the annual variation amplitude is 5.8cm, the phase is -40.8days, and the inversion of the gravity data with the CPC model The results showed that the mean variance of total water storage was 1.3cm, the annual variation amplitude was 0.1cm, the phase difference was 1.0 day.In order to further test whether GRACE can monitor the change of real water reserves in this area, The results showed that the overall mean squared error was 2.1 cm, the annual variation amplitude was 1.7 cm and the phase difference was 9.3 days.Therefore, the first comparison overestimated the ability of GRACE to monitor the change of water reserves in this area, and the second The comparison shows a more realistic picture of the actual situation. Although the inversion results are quite different from the hydrological results, it still shows that GRACE can monitor the monthly water storage changes in this area.