Electrical resistivity and porosity structure of the upper Biscayne Aquifer in Miami-Dade County, Florida

Whitman, Dean; Yeboah-Forson, Albert

doi:10.1016/j.jhydrol.2015.10.049

Cited by 9 publications

(6 citation statements)

References 24 publications

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“…Modelling petrophysical properties is a challenging process. The high heterogeneity of weathered/fractured aquifers complicates any attempt to estimate properties, as in this study porosity (Paillet and Reese, 2000;Doetsch et al, 2010;Whitman and Yeboah-Forson, 2015). This study encountered limitations typical to field studies in heterogeneous subsurface systems, attributed to: The one-and two-dimensionalities of data and models used might be insufficient in some strongly three-dimensional settings, which would require 3D ERT acquisition.…”

Section: Limitations Associated To Field Measurements and Geophysical Inversion Errors And Wider Application To 3d Heterogeneous Hard Rocmentioning

confidence: 94%

“…A variety of research studies have successfully applied geophysics to solve different quantitative problems in hydrology (Vereecken et al, 2006) and some other used these approaches specifically to model petrophysical properties in carbonate aquifers (Whitman and Yeboah-Forson, 2015) and hard rock aquifers (Descloitres et al, 2008) providing further quantitative information on the aquifer properties including storage properties (porosity, specific yield) and recharge processes.…”

Section: Introductionmentioning

confidence: 99%

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Quantification of groundwater storage heterogeneity in weathered/fractured basement rock aquifers using electrical resistivity tomography: Sensitivity and uncertainty associated with petrophysical modelling

González

Comte

Legchenko

et al. 2021

Journal of Hydrology

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Quantifying groundwater storage in weathered/fractured basement rock aquifers can be challenging owing to both their high degree of heterogeneity and their overall low storage capacity.Therefore, in these aquifers, the use of direct borehole hydraulic data is usually insufficient. Here we assessed the popular method of electrical resistivity tomography (ERT), combined with borehole data and including associated uncertainties, to resolve the spatial variability of groundwater storage properties at high resolution within a fractured mica schist aquifer in Ireland. Porosity distributions across both the saturated and unsaturated zones were calculated from two-dimensional (2D) ERT resistivities using two standard petrophysical models, Archie and Waxman & Smits (WS), the latter accounting for the influence of clay minerals on resistivity data. Our results demonstrated the importance of the hydrogeological conceptual constraints provided by ERT when parametrizing the 2D petrophysical models from borehole point data. They also confirmed the importance of accounting for clay minerals (the products of bedrock weathering processes) in the WS model, whereas predictions from Archie's model produced unrealistically high porosity values of over an order of magnitude higher than the WS model. The WS model predicted porosities decreasing exponentially with depth, with values ranging from a few % in the shallowest, most-weathered part of the bedrock (upper 5 m on average) and deep fractured zones (to about 20 m deep), to less than 1% in the underlying fissured aquifer, and possibly down another order of magnitude in the deep massive bedrock. WS-derived porosities were in agreement with independent vertical water content profiles derived from magnetic resonance sounding (MRS), as well as point storativity values estimated from borehole hydraulic testing at the study site, with particularly good matches in the upper weathered/fractured bedrock and deeply weathered/fractured zones associated with regional faults.Detailed comparison suggested that WS provides an upper-bound estimate of groundwater storage in this environment. In the deep massive, un-weathered, and poorly fractured bedrock, however, discrepancies between groundwater storage estimate obtained from the three methods (ERT, MRS, and hydraulic) prevented reliable storage quantification, owing to the methods' inherent technical limitations in such low porosity rocks. Our results demonstrated the suitability of resistivity tomography to quantify groundwater storage heterogeneity in weathered/fractured basement rock aquifers at high resolution and with reasonable overall uncertainty given the relative high uncertainties in petrophysical parameters at the kilometric scale. The results are promising for better characterization of groundwater storage variations in these hydrogeological systems, which are crucial to predict their response to climate variability and human exploitation.

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Section: Limitations Associated To Field Measurements and Geophysical Inversion Errors And Wider Application To 3d Heterogeneous Hard Rocmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Quantification of groundwater storage heterogeneity in weathered/fractured basement rock aquifers using electrical resistivity tomography: Sensitivity and uncertainty associated with petrophysical modelling

González

Comte

Legchenko

et al. 2021

Journal of Hydrology

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“…Many research projects have successfully used ERT to model the petrophysical properties of carbonate aquifers (e.g. [25]), and hard rock aquifers [26]. Other studies have also provided additional quantitative information on the aquifer properties, such as storage properties and recharge processes [27,28].…”

Section: Introductionmentioning

confidence: 99%

Field surveys in heterogeneous rock masses aimed at hydraulic conductivity assessment

Chicco,

Comina,

Mandrone

et al. 2023

SN Appl. Sci.

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In heterogeneous and fractured rock masses, joints are the most important elements controlling the hydraulic conductivity. Joints parameters are therefore crucial for estimating transport of mass and energy in many technical problems (e.g., slope stability, tunnels, geothermal and oil and gas studies). Hydraulic conductivity conceptual models follow well understood generalizations, but their quantitative estimation is not simple. Both laboratory and field tests have many limitations due to representativeness and scale effects. This study proposes a methodology for a preliminary hydraulic conductivity estimation in fractured and/or heterogeneous rock masses through a combination of in-situ geomechanical and geophysical measurements. Contact and no-contact geomechanical surveys were coupled with electric resistivity topographies in two selected test sites within a Mexican geothermal area in the framework of the Ge-Mex H2020 project. The test sites are representative of two different geological settings: a faulted rock mass with expected high hydraulic conductivity in proximity of the faulted areas and an abandoned marble quarry, with very good mechanical characteristics and negligible degree of fracturing. Moreover, both of them are located in remote areas with limited accessibility, in which rapid, time and cost-effective procedures are welcomed and recommended. The preliminary findings of this study were promising: estimated hydraulic conductivities were compared with independent laboratory measurements performed by other researchers showing a good correspondence and reliability. The proposed methodology demonstrated its reliability in decision making, in the technical support and its economical applicability also in similar difficult logistic situations. Article Highlights A combination of in-situ geomechanical and geophysical measurements was adopted for a preliminary hydraulic conductivity estimation; Obtained field data were compared with independent laboratory estimations to assess the reliability of the proposed approach and compare representativeness and scale effects; Even given the difficult logistic conditions and the limitations of the available comparisons the proposed methodology demonstrated its reliability in decision making.

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“…Groundwater columns in the shallow coastal aquifers can be characterized into fresh water, brackish water and saline water using electrical resistivity methods, employing appropriate electrode con guration. Electrical resistivity techniques were used by many researchers for the delineation of fresh-saline water interface (Ebraheem et al 1997;Hopkins and Richardson 1999;Tronicke et al 1999;Edet and Okereke 2001;Lee et al 2002;Wilson et al 2006;Bataynch 2006;Sherif et al 2006;Morrow et al 2010;Mario et al 2011;McInnis et al 2013;Befus et al 2014;Whitman and Yeboah-Forson 2015;Bahija et.al. 2018).…”

Section: Introductionmentioning

confidence: 99%

Delineation of freshwater zones in the shallow coastal aquifers of Ernakulam-Chettuva region, Central Kerala, India using electrical resistivity methods

2021

Preprint

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Freshwater zones in the shallow aquifers extending from Ernakulam to Chettuva region, central Kerala coast has been studied using electrical resistivity methods. Seasonal salinity patterns and hydrochemistry in the shallow aquifers in the region also has also been studied. The coastal zone is made up of shore parallel ridges and runnels formed by alternate marine trangressive and regressive events. Vertical Electrical Sounding (VES) was carried out at 33 locations in the area extending from the beach to approximately up to 10 km from the shoreline. The subsurface lithology and freshwater layers in the aquifer system was delineated from the resistivity model. The saline zones are intervening with fresh water zones at different depths along the coast. The salinity in the aquifer system seems to be either due to brackish water ingress or paleo-salinity. 107 dug wells from the study area were also monitored during 2008–2010 period in pre-monsoon, monsoon and post-monsoon seasons. The water samples collected in the post-monsoon 2008 was analysed for the physico-chemical parameters viz., pH, temperature, EC, total alkalinity, salinity, turbidity, TDS, chloride (Cl−), total hardness, Ca2+, Mg2+, Na+, K+, CO32−, HCO3−, Cl−, SO42−, NO3−N and Fe2+. The pH of the water samples varied from 4.47–8.32 in the post-monsoon season and 3.5–9.21 in the pre-monsoon and 5.55–9.05 in the monsoon season. The EC values ranges from 58-4500 µ mhos/cm in the post-monsoon, 59-3753 µ mhos/cm in the pre-monsoon and 51-2637 µ mhos/cm in the monsoon season. TDS values ranges from 35-2700 mg/L in the post-monsoon, 38-21190 mg/L in the pre-monsoon and 32-1668 mg/L in the monsoon season. Hill-Piper diagram indicated Ca-HCO3 is the dominant water type followed by Na-Cl type and Na-HCO3 type. Other water types are Ca-Cl, Mg-HCO3, Mg-Cl, Ca-SO4 and MgSO4.

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Electrical resistivity and porosity structure of the upper Biscayne Aquifer in Miami-Dade County, Florida

Cited by 9 publications

References 24 publications

Quantification of groundwater storage heterogeneity in weathered/fractured basement rock aquifers using electrical resistivity tomography: Sensitivity and uncertainty associated with petrophysical modelling

Quantification of groundwater storage heterogeneity in weathered/fractured basement rock aquifers using electrical resistivity tomography: Sensitivity and uncertainty associated with petrophysical modelling

Field surveys in heterogeneous rock masses aimed at hydraulic conductivity assessment

Delineation of freshwater zones in the shallow coastal aquifers of Ernakulam-Chettuva region, Central Kerala, India using electrical resistivity methods

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