Challenges of using electrical resistivity method to locate karst conduits—A field case in the Inner Bluegrass Region, Kentucky

Zhu, Junfeng; Currens, James C.; Dinger, James S.

doi:10.1016/j.jappgeo.2011.08.009

Cited by 79 publications

(48 citation statements)

References 9 publications

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“…al (1999) untuk memetakan struktur bawah permukaan karst di Nepal Tengah [5] , Zhu et. al (2011) untuk menemukan saluran hidrologi karst di Kentucky AS [6] , Fadhly et. al (2015) untuk menemukan fiture rockhead di Tapah Malaysia [7] , dan Andriani (2010) untuk penelusuran sungai bawah tanah daerah Pacitan [8] .…”

Section: Pendahuluanunclassified

Identification Karst Underground River System in Gebangharjo Village, Pracimantoro using Tomography Resistivity Methode with Wenner-Schlumberger’s Configuration

Purwanto

Darsono

Koesuma

2017

Indonesian J Appl Phys

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This research is conducted using 4 lines data with 750 meters in length. Tomography resistivity with Wenner-Schlumberger configuration is used as this research methodology to take the data with a = 50 meters and n=1, 2, 3, 4, 5, 6. Resistivitymeter OYO 2119C McOHM-EL model is used as the instrument. Furthermore, the data is processed with two softwares; Res 2 Dinv ver. 3.56.22 to get 2D resistivity section and Rock Work 16 to make 3D model of the site. The underground river's chamber is made by hollow carbonate rocks with the resistivity of >412 Ωm and 117,6 Ωm -412 Ωm for limestone's resistivity as its capsrock. Researching to the depth of 173 meters, underground rivers are shown in the line 2 in the depth of 65 to 134 meters, 65 to 173 meters in the line 3, and in the cross section of line 3 and line 4. While in the line 1, another chamber is found within the depth of 12.5 to 40 meters. It is expected that the underground river is flowing to the south because of the chamber in line 3 and line 4 are lower than line 2.

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Section: Pendahuluanunclassified

Identification Karst Underground River System in Gebangharjo Village, Pracimantoro using Tomography Resistivity Methode with Wenner-Schlumberger’s Configuration

Purwanto

Darsono

Koesuma

2017

Indonesian J Appl Phys

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“…Karst aquifers possess both diffuse and conduit flow and varying degrees of connectivity between surface and groundwater over spatial scales [9]. Zhu et al [10] state that locating conduit flow paths from the surface however, is one of the most challenging tasks in karst research. Geophysical methods are often used to help locate voids, by mapping variations of physical properties of the subsurface [10], as the conduits can cause significant contrasts in some physical properties that can be detected.…”

Section: Introductionmentioning

confidence: 99%

Geophysical Input to Improve the Conceptual Model of the Hydrogeological Framework of a Coastal Karstic Aquifer: Uley South Basin, South Australia

et al. 2018

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A lack of closely spaced datasets on layer elevations, aquifer parameters, identification of areas with high recharge potential, dominant conduit porosity zones, and well defined boundary conditions hampers the ability of groundwater models to produce a reliable water balance. Typically, geological structure, aquifer properties, and groundwater heads are obtained from point measurements which are sparse. The drillhole information in aquifers is usually available at locations far apart, distances ranging from hundreds to thousands of meters. Furthermore, pump tests are usually conducted at limited locations and generalized to the aquifer. This limited knowledge leads to errors in the conceptual understanding of the aquifer. In this study, Airborne Electromagnetic Survey (AEM) was used to define base elevations of the aquifers where drillhole information was lacking. Surface Nuclear Magnetic Resonance (sNMR), borehole NMR, Transient Electromagnetic (TEM), and downhole geophysical surveys have given new insight to the conceptualization of hydrogeological framework. These methods are relatively low in cost compared to traditional well drilling and provide information on layer elevations, aquifer parameters, point and diffuse recharge zones, and conduit porosity zones in the profile, which improves our definition of the boundary conditions. From a practical point of view, combining drillhole information with a variety of geophysical techniques provides sound datasets to develop a comprehensive conceptual model. This in turn can be used to build a robust groundwater model.

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“…Subsurface conduits often connect to land surface via sinkholes, and serve as major pathways for groundwater flow in karst aquifers. Locating conduit flow paths from the surface, however, is one of the most challenging tasks in karst research (Zhu et al, 2011). Exploitation of fresh water lenses that are formed due to point recharge from sinkholes is challenging.…”

Section: Introductionmentioning

confidence: 99%

“…Geophysical methods are often deployed to help locate voids by mapping variations of physical properties of the subsurface (Zhu et al 2011), as the conduits can cause significant contrasts of some physical properties that can be detected. Electrical resistivity is one of the commonly used geophysical methods for subsurface void detection, as a water-filled underground void has lower resistivity than most surrounding rocks whereas an air filled void has higher resistivity than most geologic material (Zhu et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Electrical resistivity is one of the commonly used geophysical methods for subsurface void detection, as a water-filled underground void has lower resistivity than most surrounding rocks whereas an air filled void has higher resistivity than most geologic material (Zhu et al, 2011). Geophysical techniques allow large areas to be covered in a short period of time and represent an efficient way of detecting subsurface heterogeneities including voids (Farooq et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Integrated Use of Geological, Geophysical, Radiocarbon and Stable Isotopes Data for Tracing the Conduit Flow Paths in a Small Karstic Aquifer: Poocher Swamp Freshwater Lens, South Australia

Somaratne¹,

Mann²

2016

ENRR

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An integrated approach combining lithological logs, downhole geophysics, electromagnetic survey and the distribution of radiocarbon ( 14 C) and the stable isotopes of water molecules ( 18 O) were used to identify the conduit flow paths of a small freshwater lens. Lost circulation zones, where drilling fluid flows into geological formation instead returning up the annulus recorded during water well drilling, were considered as the major fracture zones. The presence of high porosity zones within boreholes were identified using caliper, gamma and neutron logs. These methods were used to identify the depth intervals at which cavities and the existence of conduit porosity within the boreholes. Transient electromagnetic (TEM) method was used to investigate resistivity anomalies in the profiles along nine pre-determined lines across the freshwater lens. Resistivity anomalies were related to borehole information and other surface features such as sinkholes. Low resistivity zones of the TEM tomography sections had excellent correlation to fracture zones identified during well drilling, and downhole geophysical logs. Similarly, high resistivity zones in the profiles correlate well with the zones of O signatures of the groundwater confirm the presence of conduits and potential pathways of preferential flows. This investigation illustrates the effectiveness using an integrated approach to trace the conduit flow paths in karst aquifers. The information gained from the study is currently being used for the management of the freshwater lens.

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Challenges of using electrical resistivity method to locate karst conduits—A field case in the Inner Bluegrass Region, Kentucky

Cited by 79 publications

References 9 publications

Identification Karst Underground River System in Gebangharjo Village, Pracimantoro using Tomography Resistivity Methode with Wenner-Schlumberger’s Configuration

Identification Karst Underground River System in Gebangharjo Village, Pracimantoro using Tomography Resistivity Methode with Wenner-Schlumberger’s Configuration

Geophysical Input to Improve the Conceptual Model of the Hydrogeological Framework of a Coastal Karstic Aquifer: Uley South Basin, South Australia

Integrated Use of Geological, Geophysical, Radiocarbon and Stable Isotopes Data for Tracing the Conduit Flow Paths in a Small Karstic Aquifer: Poocher Swamp Freshwater Lens, South Australia

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