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GRACE Groundwater Drought Index: Evaluation of California Central Valley groundwater drought

机译:Grace地下水干旱指数:加州中央山谷地下水干旱评估

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Quantitative approaches to assess the complexity of groundwater drought are hindered by the lack of direct observations of groundwater over space and time. Here, we present an approach to evaluate groundwater drought occurrence based on observations from NASA's Gravity Recovery and Climate Experiment (GRACE) satellite mission. Normalized GRACE-derived groundwater storage deviations are shown to quantify groundwater storage deficits during the GRACE record, which we define as the GRACE Groundwater Drought Index (GGDI). As a case study, GGDI is applied over the Central Valley of California, a regional aquifer undergoing intensive human activities and subject to significant drought periods during the GRACE record. Relations between GGDI and other hydrological drought indices highlight our ability to capture drought delays unique to groundwater drought. Further, GGDI captures characteristics of groundwater drought that occur as a result of complex human activities and natural changes, thus presenting a framework to assess multi-driver groundwater drought characteristics. (C) 2017 Elsevier Inc. All rights reserved.
机译:评估地下水干旱复杂性的定量方法受到地下水的直接观察空间和时间的阻碍。在这里,我们提出了一种评估基于NASA重力回收和气候实验(Grace)卫星使命的观测的地下水干旱发生的方法。标准化的恩典衍生地下水储存偏差显示在恩典记录中量化地下水储存缺陷,我们将其定义为Grace地下水干旱指数(GGDI)。以案例研究为例,GGDI应用于加州中央山谷,该区域含水层正在进行密集的人类活动,并在恩典记录中受到严重的干旱期限。 GGDI与其他水文干旱指标之间的关系突出了我们捕获与地下水干旱独有的干旱延误的能力。此外,GGDI捕获了由于复杂的人类活动和自然变化而发生的地下水干旱的特征,从而提出了一种评估多驾驶员地下水干旱特性的框架。 (c)2017年Elsevier Inc.保留所有权利。

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