| 基于多源数据的弱透水层水文地质参数反演研究 |
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| 引用本文： | 石鸿蕾,郝奇琛,邵景力,崔亚莉,张秋兰.基于多源数据的弱透水层水文地质参数反演研究[J].水文地质工程地质,2021,0(2):1-7. |
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| 作者姓名： | 石鸿蕾 郝奇琛 邵景力 崔亚莉 张秋兰 |
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| 作者单位： | 1.中国地质大学（北京）水资源与环境学院，北京 100083 |
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| 基金项目： | 国家自然科学基金项目（41702282）；中国地质调查局地质调查项目（DD20160238；DD20190303） |
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| 摘 要： | 弱透水层是含水层系统的重要组成部分，其水文地质参数的准确获取一直以来都是研究难点，传统室内试验难以克服应力状态及环境变化对土层参数的影响，因此如何在原位状态下评价其水文地质参数有着重要意义。选取呼和浩特盆地某淤泥层为研究对象，基于抽水试验和溶质运移试验获得的多源数据，采用基于控制体积有限差分法的非结构化网格（Unstructured Grid）方法，建立三维地下水流-溶质运移耦合模型，对弱透水层水文地质参数进行反演。结果显示:模型计算的抽水井中水位和溶质浓度变化规律与实际观测数据能够较好拟合，模型识别出的抽水含水层渗透参数（4.8 m/d）与通过解析法计算得出的结果（4.17 m/d）相近，建立的数值模型符合实际水文地质条件；反演得到淤泥质弱透水层垂向渗透系数为1.2×10?4 m/d、储水率为1.0×10?5 m?1。基于多源数据的参数反演方法可为弱透水层参数研究提供借鉴。
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| 关 键 词： | 数值模拟 弱透水层 MODFLOW-USG 多源数据 参数反演 |
| 收稿时间： | 2020-10-13 |
Research on hydrogeological parameter inversion of an aquitard based on multi-source data: A case study of a silt layer in the Hohhot Basin |
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| Institution: | 1.School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China2.Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang, Hebei 050061, China |
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| Abstract: | An aquitard is an important part of an aquifer system. It is always difficult to determine the hydrogeological parameters of the aquitard. Traditional laboratory tests are difficult to overcome the influence of stress state and environmental change on the aquitard layer parameters. Therefore, evaluation of hydrogeological parameters under in-situ state is of great significance. This article selects a silt layer in the Hohhot Basin, and primarily designs and carries out pumping tests and solute transport tests. The unstructured grid with the controlled volume finite difference method is used to establish a 3D coupling model of groundwater flow and solute transport. Groundwater levels and concentration data are used to estimate the hydrogeological parameters of the aquitard. The results show that the variation in groundwater levels and solute concentrations in the pumping wells calculated by the model can fit well with the actual observation data, and the coefficient of permeability of the pumping aquifer identified by the model (4.8 m/d) is similar to the analytical result (4.17 m/d). The numerical model conforms to the actual hydrogeological conditions. The vertical hydraulic conductivity of the aquitard studied in this paper is 1.2×10?4 m/d, and the specific storage is 1.0×10?5 m?1. The method presented in this paper may provide references for the parameter determination of an aquitard. |
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