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首页> 外文期刊>Australian journal of water resources >Combining geology and geophysics to develop a hydrogeologic framework for salt interception in the Loxton Sands aquifer, central Murray Basin, Australia
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Combining geology and geophysics to develop a hydrogeologic framework for salt interception in the Loxton Sands aquifer, central Murray Basin, Australia

机译：结合地质和地球物理学，为澳大利亚墨累盆地中部洛克斯顿金沙含水层中的盐分拦截开发了水文地质框架

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摘要

Salt interception schemes (SIS) have been developed to manage high salt loads and to improve the health of the River Murray, both in the Riverland (South Australia) and Sunraysia (Victoria/NSW) areas. Currently SIS at Loxton and Bookpurnong, in the South Australian Riverland are being developed, both incorporating borefields in the Loxton-Parilla Sands aquifer to intercept saline groundwater flux from groundwater mounds that have formed beneath irrigated areas. A detailed interpretation of borehole geology, ground and airborne geophysics, combined with the analysis of sediments for the Loxton Sands and underlying Bookpurnong Beds has resulted in an improved hydrogeological model for the area. Lateral and vertical changes in sedimentary facies associated with the main aquifer systems relevant to the SIS are now better understood. This is an important precursor in the development of a predictive model for aquifer hydraulic properties using hydrogeological and geophysical data. Relatively thin zones of high hydraulic conductivity, associated with the lower Loxton sands sedimentary package, are characterized by slightly reduced electrical conductivity response at the watertable, and represent a target for ground and airborne EM systems. These zones have been identified as elements of a basin-wide beach-barrier strandline sequence that developed in the Pliocene. Results from the constrained inversion of helicopter EM data have helped to better define the geometry of this sedimentary system, the location of these zones and have provided elements of a predictive framework for a more informed approach to the design, development and potential performance of the Loxton Sands SIS borefields.
机译：在Riverland（南澳大利亚）和Sunraysia（维多利亚/新南威尔士州）地区，已经开发出了盐分拦截计划（SIS）来管理高盐负荷并改善默里河的健康。目前，正在开发南澳大利亚州河岸地区Loxton和Bookpurnong的SIS，它们都在Loxton-Parilla Sands含水层中合并了钻孔区，以拦截灌溉区域下方形成的地下水丘中的盐水。对井眼地质，地面和空中地球物理的详细解释，以及对Loxton沙和Bookpurnong底层的沉积物的分析，使得该地区的水文地质模型得到了改进。与SIS相关的主要含水层系统相关的沉积相的横向和垂直变化现已得到更好的理解。这是使用水文地质和地球物理数据开发含水层水力特性预测模型的重要先兆。与下部Loxton沙沉积包裹相关的高水力传导率相对较薄的区域，其特征是在水位处的电导率响应略有降低，是地面和机载EM系统的目标。这些区域已被确定为上新世发育的整个盆地范围的海滩屏障链线序列的元素。直升机EM数据受约束反演的结果有助于更好地定义该沉积系统的几何形状，这些区域的位置，并提供了预测框架的要素，从而可以更明智地进行Loxton的设计，开发和潜在性能金沙SIS钻孔场。

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