Improving large-scale groundwater models by considering fossil gradients
Improving large-scale groundwater models by considering fossil gradients
复制标题
通过考虑化石梯度改进大规模地下水模型
DOI：
10.1016/j.advwatres.2017.02.010
复制
发表时间：
2017
影响因子：
4.7
通讯作者：
C. Schüth
中科院分区：
文献类型：
--
作者：
S. Schulz;M. Walther;N. Michelsen;R. Rausch;H. Dirks;M. Al;R. Merz;O. Kolditz;C. Schüth
由于地表水有限，许多干旱至半干旱国家依赖地下水资源。尽管目前几乎没有补给，但其中一些地下水体含有大量的水，这些水是在晚更新世至早全新世的洪流时期得到补给的。与可再生系统中通常应用的管理方案相比，这些主要是化石的不可再生资源需要不同的管理方案。化石地下水是一种有限资源，其开采意味着开采含水层储存量。尽管它们几乎没有得到补给，但其中一些即使没有抽水，也表现出明显的水力梯度和流向排放区域的水流。因此，这些系统的放电量多于充电量，因此不处于稳定状态，这使得它们的建模，特别是校准，非常具有挑战性。在本研究中，我们引入了一种新的校准方法，由四个步骤组成：（i）估计化石排放成分，（ii）确定化石排放的来源，（iii）用伪稳态模型拟合水力传导率，以及（iv）通过重建抽水活动引起的水头下降，用瞬态模型拟合存储容量。最后，我们测试了我们方法的相关性，并评估了考虑或忽略化石梯度对阿拉伯半岛上部巨型含水层（UMA）含水层参数化的影响。
Due to limited availability of surface water, many arid to semi-arid countries rely on their groundwater resources. Despite the quasi-absence of present day replenishment, some of these groundwater bodies contain large amounts of water, which was recharged during pluvial periods of the Late Pleistocene to Early Holocene. These mostly fossil, non-renewable resources require different management schemes compared to those which are usually applied in renewable systems. Fossil groundwater is a finite resource and its withdrawal implies mining of aquifer storage reserves. Although they receive almost no recharge, some of them show notable hydraulic gradients and a flow towards their discharge areas, even without pumping. As a result, these systems have more discharge than recharge and hence are not in steady state, which makes their modelling, in particular the calibration, very challenging. In this study, we introduce a new calibration approach, composed of four steps: (i) estimating the fossil discharge component, (ii) determining the origin of fossil discharge, (iii) fitting the hydraulic conductivity with a pseudo steady-state model, and (iv) fitting the storage capacity with a transient model by reconstructing head drawdown induced by pumping activities. Finally, we test the relevance of our approach and evaluated the effect of considering or ignoring fossil gradients on aquifer parameterization for the Upper Mega Aquifer (UMA) on the Arabian Peninsula.
影响因子：
2.2
作者：
Engel, Max;Brueckner, Helmut;Frenzel, Peter
通讯作者：
Frenzel, Peter