Footprint of fresh submarine groundwater discharge in the Belgian coastal zone: An overview study

Q2 Earth and Planetary Sciences
Leading Edge Pub Date : 2023-09-01 DOI:10.1190/tle42090598.1
M. Paepen, Kristine Walraevens, Thomas Hermans
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引用次数: 0

Abstract

The presence of fresh groundwater is not limited to land; it also extends offshore and discharges as submarine groundwater discharge (SGD). The freshwater component of SGD (fresh submarine groundwater discharge [FSGD]) can be detected using geophysical techniques that are sensitive to salinity such as resistivity measurements. However, these measurements are often limited to either the land or marine realm, neglecting the land-marine interface. In this study, we focus on this gap by combining onshore and offshore techniques to assess variability in the FSGD footprint near the Belgian coastline through electrical resistivity tomography and continuous resistivity profiling. The difficult working conditions of the highly dynamic North Sea make this offshore survey one of the first of its kind. The footprint varies from limited outflow on the upper beach (e.g., Wenduine) to discharge around and below the low water line (e.g., De Panne, Oostduinkerke, and Knokke-Heist) in the studied areas. The occurrence, footprint, and quantity of SGD seem to be controlled by the presence and size of dune formations that constitute freshwater resources along the shore. Heterogeneity can also play a determining factor in FSGD location.
比利时海岸带海底新鲜地下水排放的足迹:综述研究
新鲜地下水的存在不仅限于土地;它还延伸到近海,并作为海底地下水排放(SGD)排放。SGD的淡水成分(淡水海底地下水排放[FSGD])可以使用对盐度敏感的地球物理技术(如电阻率测量)进行检测。然而,这些测量通常仅限于陆地或海洋领域,忽略了陆地-海洋界面。在这项研究中,我们将陆上和海上技术相结合,通过电阻率层析成像和连续电阻率剖面来评估比利时海岸线附近FSGD足迹的可变性,以此来关注这一差距。北海高度动态的恶劣工作条件使这次海上调查成为同类调查中的第一次。在研究区域内,足迹从上层海滩的有限流出(如Wenduine)到低水位线周围和下方的排放(如De Panne、Oostduinkerke和Knokke Heist)各不相同。SGD的发生、足迹和数量似乎受到构成沿岸淡水资源的沙丘形成的存在和大小的控制。异质性也可能是FSGD定位的决定因素。
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来源期刊
Leading Edge
Leading Edge Earth and Planetary Sciences-Geology
CiteScore
3.10
自引率
0.00%
发文量
180
期刊介绍: THE LEADING EDGE complements GEOPHYSICS, SEG"s peer-reviewed publication long unrivalled as the world"s most respected vehicle for dissemination of developments in exploration and development geophysics. TLE is a gateway publication, introducing new geophysical theory, instrumentation, and established practices to scientists in a wide range of geoscience disciplines. Most material is presented in a semitechnical manner that minimizes mathematical theory and emphasizes practical applications. TLE also serves as SEG"s publication venue for official society business.
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