Terrestrial and marine electrical resistivity to identify groundwater pathways in coastal karst aquifers

O’Connell, Yvonne; Daly, Eve; Henry, Tiernan; Brown, Colin

doi:10.3997/1873-0604.2017062

Cited by 11 publications

(9 citation statements)

References 61 publications

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“…The use of marine electrical resistivity tomography (ERT) confirmed that these sinkholes are partly hydraulically activated, hence, acting as submarine springs. These sinkholes are generally filled with sediments, yet, there are single examples that indicate the absence of a sediment infill (O'Connell et al 2018). The geology and structure of the telogenetic karst Burren Plateau extends several kilometres off-shore west of the Burren (Gillespie and Sautter 2018), and therefore sinkholes may accompany these structures, yet, to the knowledge of the authors, no detailed studies have yet confirmed this.…”

Section: Study Areamentioning

confidence: 98%

“…Known locations of SGD are either in conjunction with intertidal springs along the western shore of the Burren Plateau or limited to Bell Harbour and Kinvara Bay (Drew 2003;O'Connell et al 2018) with estimated discharge rates ranging between 0 and 4.3 m 3 /s, and 5-16 m 3 /s respectively (McCormack et al 2014;Schuler et al 2018). On a larger scale, significant areas of sea-surface-temperature anomalies interpreted as SGD were detected on the western side of the Burren Plateau linked to structural geology (Wilson and Rocha 2012).…”

Section: Groundwater Flow and Previous Tracer Testsmentioning

confidence: 99%

“…The geophysical analysis of the submarine sinkholes considered as potential SGD locations, show both the presence and absence of a sediment infill (O'Connell et al 2018). Such sediments might play a role in blocking or attenuating the solid wood, which needs to be considered in the interpretation of results.…”

Section: Solute and Solid Tracersmentioning

confidence: 99%

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A combined-method approach to trace submarine groundwater discharge from a coastal karst aquifer in Ireland

Schuler

Stoeckl

Schnegg³

et al. 2019

Hydrogeol J

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Knowledge about the hydraulic connections between submarine groundwater discharge (SGD) and its terrestrial coastal catchment is relevant with regard to the management of marine and coastal waters in karst areas. This study applies different methods and monitoring approaches to trace SGD between the Burren Limestone Plateau and Galway Bay in western Ireland, via an excavated sinkhole shaft and deep conduit. Areas of potential SGD were first delineated based on sea surface temperature anomalies using Landsat satellite images. Two fluorescent dyes and solid wood chips were then used as tracers. Solid wood chips were tested as potential means to circumvent the problem of high dispersion in the sea, impacting on the fluorescent dyes to yield readings below the detection limits. Sampling was conducted at 10 different terrestrial locations and in the sea at Galway Bay. Offshore sampling was conducted in transects over a period of four successive days onboard of a vessel using an automated field fluorometer and a conductivity-temperature-depth sensor. No wood chips were recovered in the sea but both fluorescent dyes were successfully sampled. The estimated travel times are in the order of 100 to 354 m/h, and localised tracer readings correlate well in space and time with low conductivity readings. By confirming hydraulic connections between the two karst features and Galway Bay, the study substantiates the hypothesised importance of Variscan veins with regard to regional groundwater flow in the region.

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Section: Study Areamentioning

confidence: 98%

Section: Groundwater Flow and Previous Tracer Testsmentioning

confidence: 99%

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A combined-method approach to trace submarine groundwater discharge from a coastal karst aquifer in Ireland

Schuler

Stoeckl

Schnegg³

et al. 2019

Hydrogeol J

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“…; O'Connell et al . ), or in combination with other geophysical methods, such as seismic, self‐potential or ground penetrating radar (GPR) (e.g. Delle Rose and Leucci ; Cardarelli et al .…”

Section: Introductionmentioning

confidence: 99%

Application of the DC resistivity method in urban geological problems of karstic areas

Plank

Polgar

2019

Near Surface Geophysics

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A B S T R A C TTerminating industrial activities may have harmful side effects on the infrastructure of a civil society. One effective method of solving environmental and geotechnical problems in urban areas is a direct-current resistivity survey. In karstic areas, largescale geological structures directly affect the near-surface, small-scale events. Reliable data on the geological background of harmful events are acquired through suitable combinations of large-scale and of small-scale high-resolution surveys. In this study, the geological background of three urban subsurface-related problems was investigated in a karstic area: collapse of a sinkhole, suffusion of a basement area, and contamination of an urban creek. In each case, the scientific work aimed at setting up of a suitable model that describes the harmful event and its geological background. For this purpose, a combination of large-scale and high-resolution resistivity data was acquired and augmented by borehole information and laboratory analyses. The error analyses of the resulting models suggest that the methodology of dual-scale geoelectric investigation of urban hazards in karstic areas can provide applicable models for mitigation measures.

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“…Airborne or ground-based geophysical methods comprise an important, non-invasive tool for mapping the nearsurface distribution of sinkholes (e.g., Krawczyk et al 2012;Malehmir et al 2016;Cueto et al 2018;Pazzi et al 2018;Mohamed et al 2019) and other salt-related structures (e.g., Boubaya, Allek and Hamoud 2011;O'Connell et al 2018;Ikard and Pease 2019) including saline groundwater bodies (Bauer-Gottwein et al 2010). Geophysical surveys can be designed to achieve a specified penetration depth over wide areas at low cost.…”

Section: Introductionmentioning

confidence: 99%

Geophysical Mapping of Shallow Rock Salt at Borabue, Northeast Thailand

Sarntima

Arjwech

Everett

2019

Near Surface Geophysics

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In the northeast of Thailand, many swamps and lakes show evidence of rock salt dissolution, with attendant environmental problems due to saline groundwater and soil salinization. The knowledge of the depth and structure of the rock salt would be useful to achieve a better understanding of the impact of its dissolution on the environment and to facilitate effective land management strategies. Geophysical methods can provide key subsurface information. Four seismic refraction profiles and three electrical resistivity tomography profiles were carried out between Nong Bo and Nong Pong reservoirs in the salt‐affected Borabue district of Maha Sarakham province. The seismic results indicate the top of shallow rock salt beneath Nong Bo reservoir as a diagnostic zone of high P‐wave velocity >3400 m/s at depths >20 m. The electrical resistivity tomography investigation shows electrical resistivity values ≳5 Ωm at similar depths, indicative also of shallow rock salt. Zones interpreted to be saline groundwater are electrically conductive, identified by electrical resistivity values ≲5 Ωm in the electrical resistivity tomography images. The combined seismic–electrical resistivity tomography interpretation suggests that shallow rock salt lies beneath the reservoirs and ponds in the Borabue district but does not appear to form a continuous body between the two largest reservoirs.

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Terrestrial and marine electrical resistivity to identify groundwater pathways in coastal karst aquifers

Cited by 11 publications

References 61 publications

A combined-method approach to trace submarine groundwater discharge from a coastal karst aquifer in Ireland

A combined-method approach to trace submarine groundwater discharge from a coastal karst aquifer in Ireland

Application of the DC resistivity method in urban geological problems of karstic areas

Geophysical Mapping of Shallow Rock Salt at Borabue, Northeast Thailand

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