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首页> 外文OA文献 >Coupling ground and airborne geophysical data with upscaling techniques for regional groundwater modeling of heterogeneous aquifers: Case study of a sedimentary aquifer intruded by volcanic dykes in Northern Ireland
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Coupling ground and airborne geophysical data with upscaling techniques for regional groundwater modeling of heterogeneous aquifers: Case study of a sedimentary aquifer intruded by volcanic dykes in Northern Ireland

机译：地面和空中地球物理数据与放大技术的耦合，用于非均质含水层的区域地下水建模：以北爱尔兰火山岩侵入的沉积含水层为例

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In highly heterogeneous aquifer systems, conceptualization of regional groundwater flow models frequently results in the generalization or negligence of aquifer heterogeneities, both of which may result in erroneous model outputs. The calculation of equivalence related to hydrogeological parameters and applied to upscaling provides a means of accounting for measurement scale information but at regional scale. In this study, the Permo-Triassic Lagan Valley strategic aquifer in Northern Ireland is observed to be heterogeneous, if not discontinuous, due to subvertical trending low-permeability Tertiary dolerite dykes. Interpretation of ground and aerial magnetic surveys produces a deterministic solution to dyke locations. By measuring relative permeabilities of both the dykes and the sedimentary host rock, equivalent directional permeabilities, that determine anisotropy calculated as a function of dyke density, are obtained. This provides parameters for larger scale equivalent blocks, which can be directly imported to numerical groundwater flow models. Different conceptual models with different degrees of upscaling are numerically tested and results compared to regional flow observations. Simulation results show that the upscaled permeabilities from geophysical data allow one to properly account for the observed spatial variations of groundwater flow, without requiring artificial distribution of aquifer properties. It is also found that an intermediate degree of upscaling, between accounting for mapped field-scale dykes and accounting for one regional anisotropy value (maximum upscaling) provides results the closest to the observations at the regional scale.
机译：在高度非均质的含水层系统中，区域地下水流模型的概念化经常导致含水层非均质性的泛化或过失，这两者都可能导致模型输出错误。与水文地质参数有关的等价计算并应用于规模放大，提供了一种在区域规模上解释测量规模信息的方法。在这项研究中，由于亚垂直趋势的低渗透性第三系白云石岩脉，北爱尔兰的Permo-Triassic Lagan谷战略含水层被观察到是异质的，即使不是不连续的。地面和空中磁力测量的解释为堤防位置提供了确定性的解决方案。通过测量堤坝和沉积岩体的相对渗透率，可以获得等效的方向渗透率，该渗透率确定了根据堤坝密度计算的各向异性。这为大型等值区块提供了参数，这些参数可以直接导入到地下水数值模型中。对具有不同放大比例的不同概念模型进行了数值测试，并将结果与​​区域流量观测进行了比较。仿真结果表明，根据地球物理数据的高渗透率，人们可以正确地解释所观测到的地下水流量的空间变化，而无需人工分配含水层的性质。还发现，在考虑映射的田间规模的堤坝和考虑到一个区域各向异性值之间的中间放大程度（最大放大比例）可提供与该区域范围内的观测值最接近的结果。

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