Groundwater salinity mapping using airborne electromagnetics and borehole data within the lower Balonne catchment, Queensland, Australia

Mullen, Ian C.; Kellett, Jim

doi:10.1016/j.jag.2006.07.004

Cited by 15 publications

(10 citation statements)

References 5 publications

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“…x s ptq " C s`Bsˆt (10) where the position of salt water advancement in the fracture is dependent on time and two constants: C s = 1.08ˆ10´1 m and B s = 9.36ˆ10´3 m¨min´1 (or 13.3 m¨day´1). The results of the N-S code simulations confirmed the strong influence of fracture aperture size on water velocity estimation.…”

Section: Advancement Of Saline Front In a Fracture Using N-smentioning

confidence: 99%

“…For this reason, authors proposed the use of pseudo (i.e., imaginary) boreholes in order to reduce the data gaps. Other researchers [10] suggest the employment of empirical models such as the Archie's law (1942) [11] to improve the best fit of experimental data (i.e., water electrical conductance) collected from wells. Lesch et al [12] demonstrated the efficiency of the regression-based statistical method for predicting, at field scale, soil spatial salinity conditions, starting from rapidly acquired electromagnetic induction data.…”

Section: Introductionmentioning

confidence: 99%

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A New Method to Infer Advancement of Saline Front in Coastal Groundwater Systems by 3D: The Case of Bari (Southern Italy) Fractured Aquifer

Masciopinto¹,

Palmiotta²

2016

Computation

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Abstract:A new method to study 3D saline front advancement in coastal fractured aquifers has been presented. Field groundwater salinity was measured in boreholes of the Bari (Southern Italy) coastal aquifer with depth below water table. Then, the Ghyben-Herzberg freshwater/saltwater (50%) sharp interface and saline front position were determined by model simulations of the freshwater flow in groundwater. Afterward, the best-fit procedure between groundwater salinity measurements, at assigned water depth of 1.0 m in boreholes, and distances of each borehole from the modelled freshwater/saltwater saline front was used to convert each position (x, y) in groundwater to the water salinity concentration at depth of 1.0 m. Moreover, a second best-fit procedure was applied to the salinity measurements in boreholes with depth z. These results provided a grid file (x, y, z, salinity) suitable for plotting the actual Bari aquifer salinity by 3D maps. Subsequently, in order to assess effects of pumping on the saltwater-freshwater transition zone in the coastal aquifer, the Navier-Stokes (N-S) equations were applied to study transient density-driven flow and salt mass transport into freshwater of a single fracture. The rate of seawater/freshwater interface advancement given by the N-S solution was used to define the progression of saline front in Bari groundwater, starting from the actual salinity 3D map. The impact of pumping of 335 L¨s´1 during the transition period of 112.8 days was easily highlighted on 3D salinity maps of Bari aquifer.

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Section: Advancement Of Saline Front In a Fracture Using N-smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Method to Infer Advancement of Saline Front in Coastal Groundwater Systems by 3D: The Case of Bari (Southern Italy) Fractured Aquifer

Masciopinto¹,

Palmiotta²

2016

Computation

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“…Rumpel et al, 2009;Sandersen et al, 2009;Høyer et al, 2011;Teatini et al, 2011). However, borehole geophysics provides important data for the corroboration and interpretation of seismic (Rasmussen, 2009;Scharling et al, 2009) and AEM surveys (Mullen and Kellett, 2007), e.g. for separating saline layers from clay layers and for measurement of detailed changes in salinity and lithology profiles at extraction wells (Buckley et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…However, geophysical well logging is necessary where there is a need for detailed assessment of the salt/freshwater distribution and estimates of e.g. chloride concentrations at the intake of water supply wells (Buckley et al, 2001;Mullen and Kellett, 2007), and where there is a need for determining the exact location of lithological boundaries.…”

Section: Introductionmentioning

confidence: 99%

Transboundary geophysical mapping of geological elements and salinity distribution critical for the assessment of future sea water intrusion in response to sea level rise

Jørgensen

Scheer

Thomsen

et al. 2012

Hydrol. Earth Syst. Sci.

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Abstract. Geophysical techniques are increasingly being used as tools for characterising the subsurface, and they are generally required to develop subsurface models that properly delineate the distribution of aquifers and aquitards, salt/freshwater interfaces, and geological structures that affect groundwater flow. In a study area covering 730 km2 across the border between Germany and Denmark, a combination of an airborne electromagnetic survey (performed with the SkyTEM system), a high-resolution seismic survey and borehole logging has been used in an integrated mapping of important geological, physical and chemical features of the subsurface. The spacing between flight lines is 200–250 m which gives a total of about 3200 line km. About 38 km of seismic lines have been collected. Faults bordering a graben structure, buried tunnel valleys, glaciotectonic thrust complexes, marine clay units, and sand aquifers are all examples of geological structures mapped by the geophysical data that control groundwater flow and to some extent hydrochemistry. Additionally, the data provide an excellent picture of the salinity distribution in the area and thus provide important information on the salt/freshwater boundary and the chemical status of groundwater. Although the westernmost part of the study area along the North Sea coast is saturated with saline water and the TEM data therefore are strongly influenced by the increased electrical conductivity there, buried valleys and other geological elements are still revealed. The mapped salinity distribution indicates preferential flow paths through and along specific geological structures within the area. The effects of a future sea level rise on the groundwater system and groundwater chemistry are discussed with special emphasis on the importance of knowing the existence, distribution and geometry of the mapped geological elements, and their control on the groundwater salinity distribution is assessed.

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“…As a consequence, most AEM datasets are inverted with a 1D model and are typically viewed as cross sections or 2D interpolated maps (e.g. Mullen and Kellett (2007); d 'Ozouville et al (2008a); Viezzoli et al (2008). Some attempts are made to visualize the results in 3D (Bosch et al, 2009;Palamara et al, 2010), but without quantification of related uncertainties.…”

mentioning

confidence: 99%

3D resistivity gridding of large AEM datasets: A step toward enhanced geological interpretation

Pryet

Ramm

Chilès

et al. 2011

Journal of Applied Geophysics

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We develop a technique allowing 3D gridding of large sets of 1D resistivity models obtained after inversion of extensive airborne EM surveys. The method is based on the assumption of a layered-earth model. 2D kriging is used for interpolation of geophysical model parameters and their corresponding uncertainties. The 3D grid is created from the interpolated data, its structure accurately follows the geophysical model, providing a lightweight file for a good rendering. Propagation of errors is tracked through the quantification of uncertainties from both inversion and interpolation procedures. The 3D grid is exported to a portable standard, which allows flexible visualization and volumetric computations, and improves interpretation. The method is validated and illustrated by a case-study on Santa Cruz Island, in the Galapagos Archipelago. dx

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Groundwater salinity mapping using airborne electromagnetics and borehole data within the lower Balonne catchment, Queensland, Australia

Cited by 15 publications

References 5 publications

A New Method to Infer Advancement of Saline Front in Coastal Groundwater Systems by 3D: The Case of Bari (Southern Italy) Fractured Aquifer

A New Method to Infer Advancement of Saline Front in Coastal Groundwater Systems by 3D: The Case of Bari (Southern Italy) Fractured Aquifer

Transboundary geophysical mapping of geological elements and salinity distribution critical for the assessment of future sea water intrusion in response to sea level rise

3D resistivity gridding of large AEM datasets: A step toward enhanced geological interpretation

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