Continuous resistivity profiling to delineate submarine groundwater discharge—examples and limitations

Day‐Lewis, Frederick D.; White, E. A. D.; Johnson, C. D.; Lane, John W.; Belaval, Marcel

doi:10.1190/1.2210056

Cited by 100 publications

(86 citation statements)

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“…In recent years, the spatial distribution of electrical resistivity obtained using electrical or electromagnetic geophysical surveys has been successfully used in hydrological studies to differentiate different sources of water based on salinity differences in the subsurface [Bauer et al, 2006;Befus et al, 2012;Cardenas and Markowski, 2011;Day-Lewis et al, 2006;Ong et al, 2010;Van Dam et al, 2009]. However, all of these studies are limited to small scales both horizontally and vertically.…”

Section: 1002/2014gl059579mentioning

confidence: 99%

Field identification of groundwater flow systems and hydraulic traps in drainage basins using a geophysical method

Jiang

Wan

Wang

et al. 2014

Geophysical Research Letters

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Groundwater flow systems and stagnant zones in drainage basins are critical to a series of geologic processes. Unfortunately, the difficulty of mapping flow system boundaries and no field example of detected stagnant zones restrict the application of the concept of nested flow systems. By assuming the variation in bulk resistivity of an aquifer with uniform porosity is mainly caused by groundwater salinity, the magnetotelluric technique is used to obtain the apparent resistivity of a profile across a groundwater-fed river in the Ordos Plateau, China. Based on the variations in apparent resistivity of the Cretaceous sandstone aquifer, the basin-bottom hydraulic trap below the river has been detected for the first time, and its size is found to be large enough for possible deposition of large ore bodies. The boundaries between local and regional flows have also been identified, which would be useful for groundwater exploration and calibration of large-scale groundwater models.

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Section: 1002/2014gl059579mentioning

confidence: 99%

Field identification of groundwater flow systems and hydraulic traps in drainage basins using a geophysical method

Jiang

Wan

Wang

et al. 2014

Geophysical Research Letters

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“…Recent advances in data interpretation and electronics have made it possible to use electromagnetic (EM) and electrical resistivity (ER) surveys to delineate groundwater interfaces non-invasively, especially in areas of seawater intrusion (Fitterman and Deszcz-Pan 1998;Day-Lewis et al 2006) and groundwater salinization (Bauer et al 2006). In arid and semi-arid environments, the salinity of groundwater-dominated lakes is increased when surface evaporation exceeds precipitation (Wood and Sanford 1990).…”

Section: Introductionmentioning

confidence: 99%

Combined use of frequency-domain electromagnetic and electrical resistivity surveys to delineate near-lake groundwater flow in the semi-arid Nebraska Sand Hills, USA

et al. 2010

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A frequency-domain electromagnetic (FDEM) survey can be used to select locations for the more quantitative and labor-intensive electrical resistivity surveys. The FDEM survey rapidly characterized the groundwaterflow directions and configured the saline plumes caused by evaporation from several groundwater-dominated lakes in the Nebraska Sand Hills, USA. The FDEM instrument was mounted on a fiberglass cart and towed by an all-terrain vehicle, covering about 25km/day. Around the saline lakes, areas with high electrical conductivity are consistent with the regional and local groundwater flow directions. The efficacy of this geophysical approach is attributed to: the high contrast in electrical conductivity between various groundwater zones; the shallow location of the saline zones; minimal cultural interference; and relative homogeneity of the aquifer materials.

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“…The electrodes were installed into the estuary floor, to a depth of approximately 0.5 m, to maximize repeatability of measurements for time-lapse imaging and comparison of results from periodic surveys, minimize cable movement resulting from storms, and ensure good electrical contact with estuarine sediments. MER surveys have been conducted with vessel-towed arrays (Belaval et al, 2003;Day-Lewis et al, 2006), but time-lapse imaging assumes that electrodes reoccupy the same locations and repeatability can be problematic for towed arrays. The resistivity surveys were conducted using a dipole-dipole survey geometry.…”

Section: Methodsmentioning

confidence: 99%

“…New approaches are needed to better characterize the spatial and temporal variations of SGD to understand the roles of episodic, tidal, and seasonal forcing. In this study, we use fiber-optic distributed temperature sensing (FO-DTS) techniques (e.g., Selker et al, 2006) and time-lapse marine electrical resistivity (MER) (e.g., Belaval et al, 2003;Manheim, et al, 2004;Day-Lewis et al, 2006;Swarzenski et al, 2006) to monitor SGD and the freshwater/saltwater interface and to provide highresolution data at near-continuous time and spatial scales.…”

Section: Introductionmentioning

confidence: 99%

Characterizing Submarine Ground‐Water Discharge Using Fiber‐Optic Distributed Temperature Sensing and Marine Electrical Resistivity

Henderson

Day‐Lewis

Lane

et al. 2008

Symposium on the Application of Geophysics to Engineering and Environmental Problems 2008

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Submarine ground-water discharge (SGD) contributes important solute fluxes to coastal waters. Pollutants are transported to coastal ecosystems by SGD at spatially and temporally variable rates. New approaches are needed to characterize the effects of storm-event, tidal, and seasonal forcing on SGD. Here, we evaluate the utility of two geophysical methods-fiber-optic distributed temperature sensing (FO-DTS) and marine electrical resistivity (MER)-for observing the spatial and temporal variations in SGD and the configuration of the freshwater/saltwater interface within submarine sediments. FO-DTS and MER cables were permanently installed into the estuary floor on a transect extending 50 meters offshore under Waquoit Bay, Massachusetts, at the Waquoit Bay National Estuarine Research Reserve, and nearly continuous data were collected for 4 weeks in summer 2007.Initial results indicate that the methods are extremely useful for monitoring changes in the complex estuarine environment. The FO-DTS produced time-series data at approximately 1-meter increments along the length of the fiber at approximately 29-second intervals. The temperature timeseries data show that the temperature at near-shore locations appears to be dominated by a semi-diurnal (tidal) signal, whereas the temperature at off-shore locations is dominated by a diurnal signal (day/night heating and cooling). Dipole-dipole MER surveys were completed about every 50 minutes, allowing for production of high-resolution time-lapse tomograms, which provide insight into the variations of the subsurface freshwater/saltwater interface. Preliminary results from the MER data show a high-resistivity zone near the shore at low tide, indicative of SGD, and consistent with the FO-DTS results.

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Continuous resistivity profiling to delineate submarine groundwater discharge—examples and limitations

Cited by 100 publications

References 0 publications

Field identification of groundwater flow systems and hydraulic traps in drainage basins using a geophysical method

Field identification of groundwater flow systems and hydraulic traps in drainage basins using a geophysical method

Combined use of frequency-domain electromagnetic and electrical resistivity surveys to delineate near-lake groundwater flow in the semi-arid Nebraska Sand Hills, USA

Characterizing Submarine Ground‐Water Discharge Using Fiber‐Optic Distributed Temperature Sensing and Marine Electrical Resistivity

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