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首页> 外文期刊>Acta Geologica Sinica - English Edition >Dealing with the Spatial Synthetic Heterogeneity of Aquifers in the North China Plain: A Case Study of Luancheng County in Hebei Province
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Dealing with the Spatial Synthetic Heterogeneity of Aquifers in the North China Plain: A Case Study of Luancheng County in Hebei Province

机译：华北平原应对含水层空间综合非均质性的研究-以河北栾城县为例

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摘要

The complexity of alluvial-pluvial fan depositional systems makes the detailed characterization of their heterogeneity difficult, yet such a detailed characterization is commonly needed for construction of reliable groundwater models. Traditional models mainly focus on using a single aquifer property to qualitatively or semi-quantitatively characterize the heterogeneity of aquifer, so that they are unable to quantitatively reflect the synthetic heterogeneity of all aquifer properties. In this paper, we propose the heterogeneity synthetic index (HSI) for quantitative characterization of synthetic heterogeneity of an aquifer. The proposed calculation process involves four steps: (1) estimation of the hydraulic conductivity of a sediment sample using the cloud-Markov model, (2) establishment of the sedimentary microfacies distribution model through the Markov chain, (3) characterization of the distribution model of hydrogeological parameters using the improved sequential simulation method according to the “facies-controlled modeling” technique, and (4) application of the entropy weight method to calculate the weight coefficient of the above aquifer properties. The HSI of an aquifer is calculated by superposition of these models according to the corresponding weight coefficient. This approach was applied to the Luancheng aquifer deposit in the southeast Hutuo River alluvial-pluvial fan in the North China Plain (NCP). The results have demonstrated that aquifer 3 which was formed in the middle Pleistocene has the strongest heterogeneity, with an HSI of 0.25–0.75. Aquifer 4 formed in the early Pleistocene shows an intermediate heterogeneity, with the HSI ranging 0.35–0.75. The weakest heterogeneity was found in aquifers 1 and 2 formed in the Holocene and late Pleistocene, with HSI values of 0.40–0.75 and 0.40–0.80, respectively. The heterogeneity of all the four aquifers is relatively strong in the radial direction of the Huai River alluvial-pluvial fan due to the abrupt change of microfacies. In contrast, in the radial direction of the Hutuo River alluvial-pluvial fan, the microfacies change mildly, and the continuity of hydrogeological parameters is better, which has resulted in weaker heterogeneity of the four aquifers in this direction. Findings suggest that the sedimentary environment has significant effects on the aquifer heterogeneity. Considering that there arc many aquifer properties, HSI can quantitatively characterize the synthetic heterogeneity of the aquifer and describe the influence of each aquifer property on the synthetic heterogeneity of the aquifer according to its weight coefficient. Thus the HSI approach can be successfully used to deal with the spatial heterogeneity of aquifer and provide a foundation for studies on contaminant transport.
机译：冲积扇沉积系统的复杂性使得很难对其非均质性进行详细描述，但是对于可靠的地下水模型的构建通常需要这种详细描述。传统模型主要集中于使用单个含水层性质来定性或半定量地描述含水层的非均质性，因此它们无法定量反映所有含水层性质的综合性非均质性。在本文中，我们提出了非均质性综合指数（HSI），用于定量表征含水层的非均质性。拟议的计算过程包括四个步骤：（1）使用云-马尔可夫模型估算沉积物样品的水力传导率；（2）通过马尔可夫链建立沉积微相分布模型；（3）表征分布模型根据“相控建模”技术，使用改进的顺序模拟方法确定水文地质参数，以及（4）应用熵权法计算上述含水层特性的权重系数。通过根据相应的权重系数将这些模型叠加来计算含水层的HSI。该方法应用于华北平原东南部Hu河河冲积扇中的栾城含水层矿床。结果表明，在中更新世形成的含水层3具有最强的非均质性，HSI为0.25-0.75。在更新世早期形成的含水层4表现出中等的非均质性，HSI范围为0.35-0.75。在全新世和晚更新世形成的含水层1和2中发现最弱的非均质性，HSI值分别为0.40-0.75和0.40-0.80。由于微相的突然变化，在淮河冲积扇的径向上，所有四个含水层的非均质性都比较强。相反，在Hu河冲积扇的径向上，微相变化较缓，水文地质参数的连续性较好，导致这四个含水层的非均质性较弱。研究结果表明，沉积环境对含水层的非均质性具有重要影响。考虑到存在许多含水层特性，HSI可以定量表征含水层的合成非均质性，并根据其权重系数描述每种含水层特性对含水层的合成非均质性的影响。因此，HSI方法可以成功地用于处理含水层的空间异质性，并为研究污染物迁移提供基础。

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