| 不同滤波方法对GRACE反演西南岩溶区陆地水储量变化的影响 |
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| 引用本文： | 张青全,潘云,宫辉力,郑龙群,诸云强.不同滤波方法对GRACE反演西南岩溶区陆地水储量变化的影响[J].地球科学,2019,44(9):2955-2962. |
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| 作者姓名： | 张青全 潘云 宫辉力 郑龙群 诸云强 |
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| 作者单位： | 1.首都师范大学资源环境与旅游学院, 北京 100048 |
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| 基金项目： | 国家自然科学基金面上项目41771456贵州省公益性基础性地质工作项目黔国土资地环函[2014]23号国家重点研发计划2017YFC0405802 |
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| 摘 要： | 不同滤波方法反演陆地水储量变化的结果不同，但目前关于西南岩溶区的不同滤波方法之间的对比研究相对较少.利用Gauss 200 km、Fan 200 km、Han 200 km和DDK4四种滤波方法反演了西南岩溶区的陆地水储量变化，并采用尺度因子进行了校正.在空间分布上，Han和Fan滤波较Gauss滤波更为平滑，但损失的真实信号更多，Han滤波损失最为严重；DDK滤波在进行南北向滤波的同时更能保持原始信号的量级和形状.在时间序列上，4种滤波的陆地水储量距平（TWSA）年趋势分别为8.64、8.77、9.05和9.39 mm/a，周年振幅分别为90.19、94.47、112.92和89.34.不同滤波反演的陆地水储量变化的空间分布差异较大；4种滤波的周年相位差别不大，且由于尺度因子的影响，校正后的陆地水储量距平振幅大小顺序为Han > Fan > Gauss > DDK.对于研究区的陆地水储量变化反演，Fan滤波和DDK滤波较好.
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| 关 键 词： | GRACE Gauss滤波 Fan滤波 Han滤波 DDK滤波 陆地水储量变化 水文地质 |
| 收稿时间： | 2019-06-12 |
The Impact of Different GRACE Filtering Methods on Inversing Terrestrial Water Storage Change in Southwestern Karst Area |
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| Abstract: | The results of different filtering methods for inversing changes in terrestrial water reserves are different, but there are relatively few comparative studies between different filtering methods for the southwestern karst area. This paper uses four filtering methods, namely Gauss 200 km, Fan 200 km, Han 200 km and DDK4 on the inversion of terrestrial water storage in the southwestern karst area, and uses scale factors to correct. In spatial distribution, Han and Fan filters are smoother than Gauss filters, but the loss of real signals is more, and Han filter loss is the most serious. DDK filtering can maintain the magnitude and shape of the original signal while performing north-south filtering. In the time series, the four filtered Terrestrial Water Storage Anomalies (TWSA) annual trends are 8.64, 8.77, 9.05 and 9.39, respectively. The annual amplitudes are 82.30, 87.47, 107.70 and 78.51. The spatial distribution of terrestrial water reserves inversion by different filters is quite different. The annual phase of the four filters is not much different, and due to the influence of scale factors, the order of corrected anomalous amplitude of terrestrial water storageis:Han > Fan > Gauss > DDK. For the inversion of terrestrial water storage change in the study area, Fan filtering and DDK filtering are better. |
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