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本文基于GRACE最新重力场模型RL05序列研究了高斯滤波、Wiener滤波、各向异性滤波三种方法在长江流域水储量变化监测中的适用性,计算了应用三种方法得到的水储量变化速率。通过与长江流域水文模型的比较,高斯滤波平滑半径为430km时所得的结果与Wiener滤波基本一致,但各向异性滤波反演的结果与水文模型更为接近,并且优于前面两种方法。研究结果表明GRACE RL05时变重力场球谐系数误差存在各向异性的分布特征,因此各向异性滤波更适用于GRACE区域水储量变化的研究。
Based on GRACE latest gravity field model RL05, this paper studies the applicability of Gaussian filter, Wiener filter and anisotropic filter in the monitoring of water reserves in the Yangtze River Basin. The rate of change of water storage obtained by the three methods is calculated. Compared with the hydrological model in the Yangtze River Basin, the result obtained by the Gaussian filter with a radius of 430 km is basically the same as that of the Wiener filter. However, the anisotropic filter inversion results are much closer to those of the hydrological model and are superior to the two previous methods. The results show that there is an anisotropic distribution error in GRACE RL05 time-dependent gravitation field. Therefore, anisotropic filtering is more suitable for studying GRACE regional water reserves.