3D characterisation and quantification of an offshore freshened groundwater system in the Canterbury Bight

3D characterisation and quantification of an offshore freshened groundwater system in the Canterbury Bight
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坎特伯雷湾离岸淡水地下水系统的 3D 表征和量化

DOI:
10.1038/s41467-020-14770-7
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发表时间:
2020
影响因子:
16.6
通讯作者:
Tiwari
Tiwari
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Micallef;Person;Haroon;Weymer;Schwalenberg;Faghih;Mountjoy;Averes;Tiwari

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尽管全球许多大陆边缘都有近海淡水(OFG)系统的记录,但其几何形状、控制和就位动态仍然缺乏约束。在这里,我们将受控源电磁、地震反射和钻孔数据与水文模型相结合,以定量描述新西兰坎特伯雷附近以前未知的 OFG 系统。 OFG 系统由一个主要地下水体和两个较小的低盐度地下水体组成。主体距海岸60公里,海水深度110米。我们将盐度沿大陆架的变化归因于渗透性管道和正常断层造成的渗透性异质性,以及海平面低位期间河流的补给。推断出 OFG 的大气起源和陆上地下水的活跃迁移。然而,模拟结果表明,大部分 OFG 是在过去 300 ka 的海平面低位期间通过地形驱动的流动而安置的。如果考虑到像坎特伯雷边缘这样陡峭的沿海地形的活跃边缘,那么 OFG 的全球体积估计将被大幅修改。
Although offshore freshened groundwater (OFG) systems have been documented in numerous continental margins worldwide, their geometry, controls and emplacement dynamics remain poorly constrained. Here we integrate controlled-source electromagnetic, seismic reflection and borehole data with hydrological modelling to quantitatively characterise a previously unknown OFG system near Canterbury, New Zealand. The OFG system consists of one main, and two smaller, low salinity groundwater bodies. The main body extends up to 60 km from the coast and a seawater depth of 110 m. We attribute along-shelf variability in salinity to permeability heterogeneity due to permeable conduits and normal faults, and to recharge from rivers during sea level lowstands. A meteoric origin of the OFG and active groundwater migration from onshore are inferred. However, modelling results suggest that the majority of the OFG was emplaced via topographically-driven flow during sea level lowstands in the last 300 ka. Global volumetric estimates of OFG will be significantly revised if active margins, with steep coastal topographies like the Canterbury margin, are considered.
DOI: 10.1306/05241615143
发表时间: 2017
期刊: AAPG Bulletin
影响因子: 3.5
作者:
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影响因子: 5.2
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发表时间: 2002
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