Improved groundwater modeling by incorporating geological information from hydrogeological sections

IF 0.8 Q4 WATER RESOURCES
Massimiliano Schiavo
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引用次数: 0

Abstract

Geological cross-sections are usually employed in the hydrogeological model conceptualization, but their usage may not be easily exploited in subsequent modeling phases. The spatial distribution of geological facies along a geological section’s track may significantly vary when using random facies fields, and these may not be faithful to the original conceptualization described by the geological section. The present work offers a novel framework for improving available hydrogeological models using geological sections as a more quantitative source of information, hence by taking into account of information coming from a geological section. Then, this information given by the change in the distribution of porosities is transferred from the section’s track to surrounding locations through a proper kriging procedure upon a chosen Correlation Scale (R), which is exponentially correlated in space. This procedure is tested by using porosity distributions upon several R, associating a conductivity value with each porosity one through empirical formulations, and informing several numerical models related to a real case study (an aquifer in the province of Lecco, Northern Italy). The proposed procedure enables to significantly outperform the former calibrated numerical model. Best-calibrated models show that the convenient R could be from 2 to 5 kilometers long, consistent with the width of the alluvial and fluvioglacial floodplain that characterizes the aquifer under examination.
结合水文地质剖面的地质信息,改进了地下水模型
地质剖面通常用于水文地质模型的概念化,但在后续的建模阶段可能不容易利用。当使用随机相场时,地质相沿地质剖面轨迹的空间分布可能会有很大的变化,这些可能不忠实于地质剖面所描述的原始概念。目前的工作提供了一个新的框架,用于改进现有的水文地质模型,使用地质剖面作为更定量的信息来源,因此考虑到来自地质剖面的信息。然后,孔隙度分布的变化所给出的信息通过适当的克里格程序,根据选择的相关尺度(R)从剖面的轨迹传递到周围的位置,该尺度在空间上呈指数相关。通过使用几个R上的孔隙度分布,通过经验公式将电导率值与每个孔隙度值相关联,并将与实际案例研究(意大利北部莱科省的含水层)相关的几个数值模型进行测试。所提出的程序能够显著优于以前的校准数值模型。经过最佳校准的模型显示,方便的R值可以在2到5公里之间,与表征所研究含水层的冲积和河流冰川泛滥平原的宽度一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
1.80
自引率
50.00%
发文量
36
审稿时长
8 weeks
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