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Hydrogeological assessment of springs in the south-central Great Artesian Basin of Australia
Hydrogeology Journal ( IF 2.4 ) Pub Date : 2021-04-06 , DOI: 10.1007/s10040-021-02335-x
R. J. Fensham , T. Doyle , M. A. Habermehl , B. Laffineur , J. L. Silcock

Artesian springs support important wetland ecosystems comprising highly specialised, endemic animal and plant species. Understanding the hydrogeological processes that sustain springs is critical to their management and characterisation of the connected groundwater system. This paper focuses on the springs of the Eulo and Bourke supergroups in the south-central part of the Great Artesian Basin in Queensland and New South Wales, Australia. These springs have been heavily impacted by aquifer drawdown, as a result of uncontrolled discharge of artesian water from pastoral bores. This study uses a stratigraphic model of the aquifer and aquitard sediments, a model of the potentiometric surface, existing information on the coverage of basement and surface structures, and a comprehensive field survey of all known springs to identify the association of springs with the edge of the geological basin, basement outcrop, basement highs, surface and deep basement faults, and a thinned aquitard. Many springs in the Eulo Supergroup are associated with basement highs and many springs are associated with deep faults, suggesting that reactivation of these faults may be an important cause of spring discharge. Springs in the Bourke Supergroup previously thought to be outcrop springs (gravity-fed), by virtue of their surface characteristics, are more likely to be artesian springs based on the interpretation of basement geology, surface faults and water chemistry, which align most closely to the Hooray Sandstone, the artesian aquifer underlying the springs.



中文翻译:

澳大利亚中南部大自流盆地的温泉水文地质评估

自流泉支持重要的湿地生态系统,其中包括高度专业化的特有动植物物种。了解维持泉水的水文地质过程对于其管理和表征相连的地下水系统至关重要。本文重点研究澳大利亚昆士兰州和新南威尔士州大自流盆地中南部的Eulo和Bourke超群的春天。由于不受控制地从牧草孔中排放自流水,这些泉水受到含水层降落的严重影响。这项研究使用了含水层和阿奎塔尔沉积物的地层模型,电位计表面模型,有关地下室和表面结构覆盖的现有信息,并对所有已知的泉水进行全面的野外调查,以查明泉水与地质盆地边缘,地下露头,地下高点,地表和深层地下断层以及变薄的阿基塔德之间的联系。Eulo超群中的许多弹簧与地下室的高点有关,许多弹簧与深部的断层有关,这表明这些断层的重新激活可能是释放弹簧的重要原因。根据地下地质,表面断层和水化学的解释,伯克超级群中的温泉由于其表面特征,以前被认为是露头温泉(重力重力),更可能是自流泉。霍雷砂岩(Hooray Sandstone),泉水下方的自流含水层。地下室高点,地下和深层地下断层,以及稀薄的阿基德。Eulo超群中的许多弹簧与地下室的高点有关,许多弹簧与深部的断层有关,这表明这些断层的重新激活可能是释放弹簧的重要原因。根据地下地质,表面断层和水化学的解释,伯克超级群中的温泉由于其表面特征,以前被认为是露头温泉(重力重力),更可能是自流泉。 Hooray砂岩,泉水下方的自流含水层。地下室高点,地下和深层地下断层,以及稀薄的阿基德。Eulo超群中的许多弹簧与地下室的高点有关,许多弹簧与深部的断层有关,这表明这些断层的重新激活可能是释放弹簧的重要原因。根据地下地质,表面断层和水化学的解释,伯克超级群中的温泉由于其表面特征,以前被认为是露头温泉(重力重力),更可能是自流泉。霍雷砂岩(Hooray Sandstone),泉水下方的自流含水层。提示重新激活这些故障可能是弹簧释放的重要原因。根据地下地质,表面断层和水化学的解释,伯克超级群中的温泉由于其表面特征,以前被认为是露头温泉(重力重力),更可能是自流泉。霍雷砂岩(Hooray Sandstone),泉水下方的自流含水层。提示重新激活这些故障可能是弹簧释放的重要原因。根据地下地质,表面断层和水化学的解释,伯克超级群中的温泉由于其表面特征,以前被认为是露头温泉(重力重力),更可能是自流泉。霍雷砂岩(Hooray Sandstone),泉水下方的自流含水层。

更新日期:2021-04-06
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