揭示汇聚径向流条件下高度异质含水层的复杂性

IF 8.7 2区 工程技术 Q1 Mathematics Engineering with Computers Pub Date : 2024-04-03 DOI:10.1007/s00366-024-01968-2
Guglielmo Federico Antonio Brunetti, Mario Maiolo, Carmine Fallico, Gerardo Severino
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引用次数: 0

摘要

弄清含水层中的流动和质量传输对于有效的水资源管理和保护至关重要。然而,了解此类现象的内在机理具有挑战性,尤其是在高度异质的天然含水层中。过去的研究一直受限于缺乏密集的数据序列和实验模型,无法精确了解此类含水层的特征。为了弥补这一差距并推进我们目前的理解,我们介绍了一项开创性实验研究的结果,该研究描述了在径向流动条件下,一个独特的、强异质性的、实验室构建的中间尺度相生含水层的特征。这种强异质性是通过在 7 层中随机分布 2527 个单元来实现的,每层都填充了 12 种不同土壤混合物中的一种,其纹理特征、孔隙率和饱和导流系数都是在实验室中测量的。我们在距离中央抽水井不同距离的径向放置了 37 个完全贯通的压强计,以便进行广泛的抽水测试活动,从而获得每个压强计位置的饱和导流值以及沿八个方向的缩放规律。结果显示,含水层的强烈异质性导致饱和水力传导性在垂直和方向上存在明显的各向异性。此外,我们还首次通过实验证明,当从异质性尺度过渡到调查尺度时,多孔介质趋向于均匀性。这些新发现是在一个独特的高度异质含水层上获得的,为该领域做出了贡献,并为研究流动和质量传输现象的研究人员提供了宝贵的见解。所获得的综合数据集将为今后的研究奠定基础,并作为验证以往对强异质含水层研究结果的工具。
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Unraveling the complexities of a highly heterogeneous aquifer under convergent radial flow conditions

Untangling flow and mass transport in aquifers is essential for effective water management and protection. However, understanding the mechanisms underlying such phenomena is challenging, particularly in highly heterogeneous natural aquifers. Past research has been limited by the lack of dense data series and experimental models that provide precise knowledge of such aquifer characteristics. To bridge this gap and advance our current understanding, we present the findings of a pioneering experimental investigation that characterizes a unique, strongly heterogeneous, laboratory-constructed phreatic aquifer at an intermediate scale under radial flow conditions. This strong heterogeneity was achieved by randomly distributing 2527 cells across 7 layers, each filled with one of 12 different soil mixtures, with their textural characteristics, porosity, and saturated hydraulic conductivity measured in the laboratory. We placed 37 fully penetrating piezometers radially at varying distances from the central pumping well, allowing for an extensive pumping test campaign to obtain saturated hydraulic conductivity values for each piezometer location and scaling laws along eight directions. Results reveal that the aquifer’s strong heterogeneity led to significant vertical and directional anisotropy in saturated hydraulic conductivity. Furthermore, we experimentally demonstrated for the first time that the porous medium tends toward homogeneity when transitioning from the scale of heterogeneity to the scale of investigation. These novel findings, obtained on a uniquely highly heterogeneous aquifer, contribute to the field and provide valuable insights for researchers studying flow and mass transport phenomena. The comprehensive dataset obtained will serve as a foundation for future research and as a tool to validate findings from previous studies on strongly heterogeneous aquifers.

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来源期刊
Engineering with Computers
Engineering with Computers 工程技术-工程:机械
CiteScore
16.50
自引率
2.30%
发文量
203
审稿时长
9 months
期刊介绍: Engineering with Computers is an international journal dedicated to simulation-based engineering. It features original papers and comprehensive reviews on technologies supporting simulation-based engineering, along with demonstrations of operational simulation-based engineering systems. The journal covers various technical areas such as adaptive simulation techniques, engineering databases, CAD geometry integration, mesh generation, parallel simulation methods, simulation frameworks, user interface technologies, and visualization techniques. It also encompasses a wide range of application areas where engineering technologies are applied, spanning from automotive industry applications to medical device design.
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