Evaluation of inferred conduit configurations in the Yucatan karst system (Mexico) from gravity and aeromagnetic anomalies, using MODFLOW-CFPv2

IF 2.4 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Miguel Moreno-Gómez, Alireza Kavousi, Carolina Martínez-Salvador, Thomas Reimann
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引用次数: 0

Abstract

Karst aquifers are complex systems characterized by high heterogeneity and anisotropy. Karst hydrological duality is evident in processes such as recharge, storage, and flow. The MODFLOW Conduit Flow Process (CFP) simulates this flow duality. In this study, CFP version 2 (CFPv2) was applied to the Yucatan karst in Mexico, known for its well-developed karst features, including subsurface conduits. Given the sparse data regarding the three-dimensional location and connectivity of conduits and underwater coastal springs, the theoretical conduit pathways were inferred from geology or geophysics. CFPv2 was utilized to evaluate these theoretical conduit network arrangements based on indirect data from gravimetry, geophysics, and geological information from the second-largest impact crater on Earth. The Merida Metropolitan Area (a densely populated region in the Mexican state of Yucatan) was selected as the study area. Piezometric data from 43 monitoring wells (collected during the monitoring period 1996–2001) formed the basis for model inversion. Recharge volumes were derived from precipitation data collected from 14 climatic stations. Results were compared with a previous groundwater flow model applied in the same area utilizing the CFP Mode 2, a turbulent flow-enabled single continuum model. Results of this study support the hypothesis of multirings of preferential flow influencing groundwater dynamics, providing important insights regarding the sub-surface in this karst region.

Abstract Image

利用 MODFLOW-CFPv2 评估根据重力和航空磁异常推断出的尤卡坦岩溶系统(墨西哥)的导管构造
岩溶含水层是以高度异质性和各向异性为特征的复杂系统。岩溶水文的双重性在补给、储存和流动等过程中都很明显。MODFLOW 干流过程(CFP)可模拟这种流动的双重性。本研究将 CFP 第 2 版(CFPv2)应用于墨西哥尤卡坦岩溶,该岩溶以其发达的岩溶特征(包括地下导管)而闻名。由于有关导管和水下沿岸泉水的三维位置和连通性的数据稀少,理论上的导管路径是根据地质学或地球物理学推断出来的。利用 CFPv2,根据重力测量、地球物理的间接数据和地球上第二大撞击坑的地质信息,对这些理论导流网络安排进行了评估。研究区域选在梅里达都市区(墨西哥尤卡坦州人口稠密地区)。43 口监测井(1996-2001 年监测期间收集)的压强数据是反演模型的基础。补给量来自 14 个气候站收集的降水数据。研究结果与之前在同一地区使用的地下水流模型(CFP 模式 2)进行了比较,CFP 模式 2 是一种支持湍流的单一连续模型。这项研究的结果支持了多圈优先流影响地下水动态的假设,为了解这一岩溶地区的地下情况提供了重要依据。
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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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