Catchment‐Scale Architecture of the Deep Critical Zone Revealed by Seismic Imaging
Catchment‐Scale Architecture of the Deep Critical Zone Revealed by Seismic Imaging
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DOI：
10.1029/2022gl098433
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发表时间：
2022-06
影响因子：
5.2
通讯作者：
S. Pasquet;J. Marçais;J. Hayes;P. Sak;Lin Ma;J. Gaillardet
中科院分区：
文献类型：
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作者：
S. Pasquet;J. Marçais;J. Hayes;P. Sak;Lin Ma;J. Gaillardet
风化和侵蚀过程对关键带（CZ）的演变、景观形成和自然资源的可用性至关重要。虽然许多这些过程发生在深CZ（100 -100米），其结构的直接信息仍然很少。近地表地球物理学提供了一种具有成本效益且侵入性最小的钻井替代方案，可提供有关CZ物理特性的信息。我们提出了一种新的工作流程，结合地震测量，岩石物理建模和地质统计分析，以表征深CZ的架构在集水区规模，在火山热带岛屿巴斯特尔（瓜德罗普，法国）。通过这种原始的工作流程，我们首次能够通过单一的地球物理方法联合制作整个流域的地下水位和风化锋图。这张CZ的综合视图突出了复杂的风化模式，要求超越“简单”的山坡CZ模型。
Weathering and erosion processes are crucial to Critical Zone (CZ) evolution, landscape formation and availability of natural resources. Although many of these processes take place in the deep CZ (∼10–100 m), direct information about its architecture remain scarce. Near‐surface geophysics offers a cost‐effective and minimally intrusive alternative to drilling that provides information about the physical properties of the CZ. We propose a novel workflow combining seismic measurements, petrophysical modelling and geostatistical analysis to characterize the architecture of the deep CZ at the catchment scale, on the volcanic tropical island of Basse‐Terre (Guadeloupe, France). With this original workflow, we are for the first time able to jointly produce maps of the water table and the weathering front across an entire catchment, by means of a single geophysical method. This integrated view of the CZ highlights complex weathering patterns that call for going beyond “simple” hillslope CZ models.