| 利用正向建模方法反演三峡库区水储量变化 |
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| 引用本文： | 李 圳,高永泉,章传银,柯宝贵,李婉秋.利用正向建模方法反演三峡库区水储量变化[J].大地测量与地球动力学,2018,38(9):930-936. |
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| 作者姓名： | 李 圳 高永泉 章传银 柯宝贵 李婉秋 |
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| 摘 要： | 针对GRACE数据后处理过程中滤波导致的信号衰减和泄漏，利用模拟数据研究正向建模改正，改正的量级约为1 cm，在利用GRACE反演陆地水储量变化时这一影响因素不可忽略。基于2002-07~2014-12的GRACE Level-2数据反演三峡库区的水储量变化，结果表明，正向建模改正前后GRACE年周期项振幅分别为7.0±2.4 cm和7.2±2.7 cm，改正后信号泄漏有所减小；GRACE和水文模式数据均表现出明显的季节性特征，但GRACE受多种因素的综合影响，其周年项振幅略大于水文模式；水库3次蓄水引起的等效水高变化分别为60.2 mm、28.3 mm、20.5 mm，与利用水位观测估计得到的库区容量变化具有较好的一致性；分析2003~2009年正向建模改正前后GRACE反演得到的三峡地区等效水高变化速度的空间分布发现，改正后库区蓄水信号明显收敛。
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| 关 键 词： | GRACE 正向建模 水储量变化 三峡 水文模型 |
Investigation of Water Storage Variation in the Three Gorges Using the Forward Modeling Method |
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| LI Zhen,GAO Yongquan,ZHANG Chuanyin,KE Baogui,LI Wanqiu.Investigation of Water Storage Variation in the Three Gorges Using the Forward Modeling Method[J].Journal of Geodesy and Geodynamics,2018,38(9):930-936. |
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| Authors: | LI Zhen GAO Yongquan ZHANG Chuanyin KE Baogui LI Wanqiu |
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| Abstract: | According to the attenuation and leakage of signal caused by filtering in GRACE data post-processing, the corrective effect of forward modeling is studied using simulation data. It is revealed that the degree of correction is about 1 cm, which cannot be neglected when using GRACE to investigate terrestrial water storage variation. Based on GRACE RL05 Level-2 data from July 2002 to December 2014, the variation of water storage in the Three Gorges reservoir is investigated. The results reveal that the annual amplitude of GRACE time series before and after forward modeling is 7.0±2.4 cm and 7.2±2.7 cm respectively, and the leakage error reduces after correction. GRACE and hydrological models show obvious seasonal variations, but the annual amplitude of the GRACE is slightly larger than that of the hydrological model, since GRACE is influenced by many more factors. GRACE can detect the equivalent water height change of the Three Gorges reservoir, which are 60.2 mm, 28.3 mm and 20.5 mm respectively, showing good agreement with the water level observations. We analyze the equivalent water variation rates in the Three Gorges area from 2003 to 2009 before and after modeling, finding that the signal of water storage obviously converges after forward modeling correction. |
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| Keywords: | GRACE forward modeling water storage variation the Three Gorges hydrological model |
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