Toward calibration of regional groundwater models using GRACE data
Toward calibration of regional groundwater models using GRACE data
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DOI：
10.1016/j.jhydrol.2011.10.025
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发表时间：
2012-02
影响因子：
6.4
通讯作者：
A. Sun;R. Green;S. Swenson;M. Rodell
中科院分区：
文献类型：
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作者：
A. Sun;R. Green;S. Swenson;M. Rodell
区域地下水模型越来越多地被用于短期和长期水资源规划，因为预计气候变化和人口增长会更大。然而，由于缺乏现场测量，这些模型中的许多都受到结构和参数不确定性的影响。近年来，重力恢复和气候实验(GRACE)卫星任务在跟踪大区域总蓄水量变化方面显示出巨大的潜力。由GRACE推断的地下水储量变化模式可以作为校准区域地下水模型的额外正规化机制。受GRACE在监测地下水储量变化方面取得的成功的鼓舞，这项研究探索了结合使用现场水位测量和GRACE得出的地下水储量变化来校准区域地下水模型。所产生的优化问题使用进化优化算法来解决。我们为德克萨斯州西部水力连接的爱德华兹-三一高原和佩科斯山谷含水层(总面积115,000平方公里)演示了拟议的校准策略。2002年至2007年的月度GRACE数据被用来重新校准为该地区开发的区域地下水模型。我们的结果表明：(I)仅使用现场数据进行校准可能会产生多个似是而非的解，这是水文学家所熟知的现象；(Ii)GRACE数据有助于在研究期间进一步限制模型参数，因此，在其他数据来源中，可能会被持续同化，以增强现有的区域地下水模型。
Regional groundwater models are increasingly used for short- and long-term water resources planning, in anticipation of greater climate variability and population growth. However, many of these models are subject to structural and parametric uncertainties because of the lack of field measurements. In recent years, the Gravity Recovery and Climate Experiment (GRACE) satellite mission has shown great potential for tracking total water storage changes over large regions. The pattern of groundwater storage changes inferred from GRACE may be incorporated as an additional regularization mechanism for calibrating regional groundwater models. Motivated by the demonstrated success of GRACE for monitoring groundwater storage changes, this study explores the combined use of in situ water level measurements and GRACE-derived groundwater storage changes for calibrating regional groundwater models. The resulting optimization problem is solved using an evolutionary optimization algorithm. We demonstrate the proposed calibration strategy for the hydraulically connected Edwards–Trinity Plateau and Pecos Valley aquifers (total area 115,000km2) in west Texas. Monthly GRACE data from 2002 to 2007 were used to recalibrate a regional groundwater model developed for the area. Our results indicate that (i) calibration using in situ data alone may yield multiple plausible solutions, a phenomenon well known to hydrologists; and (ii) GRACE data helped further constrain model parameters over the study period and, thus, may be continuously assimilated, among other sources of data, for enhancing existing regional groundwater models.