基于流动阻力法识别二维离散断裂网络中优先流动路径的有效方法

IF 2.4 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Lei Ma, Xuelin Cui, Chunchao Zhang, Jiazhong Qian, Di Han, Yongshuai Yan
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引用次数: 0

摘要

在断裂地质介质中,优先流的特点通常是流体流动迅速而集中,优先流路径(PFP)主导着流体流量和流速。因此,识别优先流路对于定量描述断裂介质中的流体流动,尤其是离散断裂网络(DFN)中的流体流动具有重要意义。识别 PFP 的传统方法需要求解地下水流模型,但这类模型受限于复杂的地下水相关问题、需要详细的水文地质勘测数据以及较高的计算工作量。本研究提出了一种基于图论的流动阻力方法,用于识别 DFN 中的 PFP。该方法利用断裂迹线的流动阻力来识别相应的最小阻力路径。根据修正立方律公式,流动阻力被定义为断裂网络中相邻节点之间的加权系数,然后使用 Dijkstra 算法确定最小阻力路径。通过 COMSOL Multiphysics 进行数值模拟,对流动阻力法进行了案例分析验证。结果表明,流体倾向于沿着流动阻力较小的路径流动,最小阻力路径与优先流动路径基本一致。该方法只需从裂缝的几何参数中提取流动阻力值,然后快速分析裂缝网络路径,即可确定优先流动路径。该方法无需借助复杂的地下水流模型来求解,为确定优先流道提供了一种有效且高效的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effective method for identification of preferential flow paths in two-dimensional discrete fracture networks based on a flow resistance method

Effective method for identification of preferential flow paths in two-dimensional discrete fracture networks based on a flow resistance method

Preferential flow is usually characterized by rapid and concentrated fluid flow in fractured geological media, and preferential flow paths (PFP) dominate the fluid flux and velocity. Therefore, the identification of PFP is significant for quantitatively characterizing fluid flow in fractured media, especially in discrete fracture networks (DFN). The traditional methods of identifying PFP need to solve groundwater flow models; however, such models are limited by complex groundwater-related problems, the need for detailed hydrogeological survey data, and a high computational workload. In this study, a graph-theory-based flow resistance method is proposed for identifying the PFP in DFN. The method uses the flow resistance of fracture trace lines to identify the corresponding minimum resistance path. The flow resistance is defined as the weighted factor between the adjacent nodes in the fracture network based on the formula of the modified cubic law, and then the Dijkstra algorithm is used to determine the minimum resistance path. The flow resistance method is verified through case analysis by numerical simulation with COMSOL Multiphysics. The results show that the fluid tends to flow along the path with less flow resistance, and the minimum resistance path is essentially consistent with the preferential flow path. The method only needs to extract flow resistance values from the geometric parameters of the fractures, and then quickly analyze the fracture-network pathways to identify the preferential flow path. The method provides an effective and efficient way of identifying the preferential flow path without resorting to complex groundwater flow models to find the solution.

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来源期刊
Hydrogeology Journal
Hydrogeology Journal 地学-地球科学综合
CiteScore
5.40
自引率
7.10%
发文量
128
审稿时长
6 months
期刊介绍: Hydrogeology Journal was founded in 1992 to foster understanding of hydrogeology; to describe worldwide progress in hydrogeology; and to provide an accessible forum for scientists, researchers, engineers, and practitioners in developing and industrialized countries. Since then, the journal has earned a large worldwide readership. Its peer-reviewed research articles integrate subsurface hydrology and geology with supporting disciplines: geochemistry, geophysics, geomorphology, geobiology, surface-water hydrology, tectonics, numerical modeling, economics, and sociology.
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