利用导管网络模型组合重建高山岩溶系统的地质历史,从而加深对该系统地下水流的理解

IF 5.7 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Chloé Fandel, T. Ferré, François Miville, P. Renard, N. Goldscheider
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引用次数: 0

摘要

摘要重建岩溶地区的地质历史可以加深对该系统当今水文地质功能的了解,并有助于预测未勘探导管的位置。本研究通过将一系列模型网络与观测到的网络图进行比较,对描述控制高山岩溶集水区溶洞形成的过去条件的各种相互竞争的假设进行了检验。该集水区是戈特萨克岩溶系统(德国和奥地利),由三个主要泉眼和一个古泉眼排泄,包括部分已探明的霍洛赫洞穴,该洞穴由一个活跃段和一个不活跃段组成,前者的形成已被充分了解,而后者的形成还存在争议。关于非活动区的形成,有以下两种假设:(1) 冰川作用掩盖了现今的三个泉眼,只留下了古泉眼,或者 (2) 三个主要泉眼中最低的泉眼(Sägebach)相对较年轻,因此它的子汇水区以前是向古泉眼排水的。使用 pyKasso Python 库(基于各向异性快速行进方法)对这些假设进行了测试,生成了两个网络集合,每个集合代表一种情况。然后将每个集合与已知洞穴地图进行比较。根据假设 2 生成的模拟网络比根据假设 1 生成的网络更接近观察到的洞穴地图,这支持了 Sägebach 泉水年轻的结论,并表明洞穴很可能继续向南延伸。最后,这项研究将模型集合方法的适用范围从地质环境已知但网络未知的情况扩展到网络已知但地质演化未知的情况。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Improving understanding of groundwater flow in an alpine karst system by reconstructing its geologic history using conduit network model ensembles
Abstract. Reconstructing the geologic history of a karst area can advance understanding of the system's present-day hydrogeologic functioning and help predict the location of unexplored conduits. This study tests competing hypotheses describing past conditions controlling cave formation in an alpine karst catchment, by comparing an ensemble of modeled networks to the observed network map. The catchment, the Gottesacker karst system (Germany and Austria), is drained by three major springs and a paleo-spring and includes the partially explored Hölloch cave, which consists of an active section whose formation is well-understood and an inactive section whose formation is the subject of debate. Two hypotheses for the formation of the inactive section are the following: (1) glaciation obscured the three present-day springs, leaving only the paleo-spring, or (2) the lowest of the three major springs (Sägebach) is comparatively young, so its subcatchment previously drained to the paleo-spring. These hypotheses were tested using the pyKasso Python library (built on anisotropic fast-marching methods) to generate two ensembles of networks, one representing each scenario. Each ensemble was then compared to the known cave map. The simulated networks generated under hypothesis 2 match the observed cave map more closely than those generated under hypothesis 1. This supports the conclusion that the Sägebach spring is young, and it suggests that the cave likely continues southwards. Finally, this study extends the applicability of model ensemble methods from situations where the geologic setting is known but the network is unknown to situations where the network is known but the geologic evolution is not.
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来源期刊
Hydrology and Earth System Sciences
Hydrology and Earth System Sciences 地学-地球科学综合
CiteScore
10.10
自引率
7.90%
发文量
273
审稿时长
15 months
期刊介绍: Hydrology and Earth System Sciences (HESS) is a not-for-profit international two-stage open-access journal for the publication of original research in hydrology. HESS encourages and supports fundamental and applied research that advances the understanding of hydrological systems, their role in providing water for ecosystems and society, and the role of the water cycle in the functioning of the Earth system. A multi-disciplinary approach is encouraged that broadens the hydrological perspective and the advancement of hydrological science through integration with other cognate sciences and cross-fertilization across disciplinary boundaries.
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