Combining fiber optic DTS, cross-hole ERT and time-lapse induction logging to characterize and monitor a coastal aquifer

Folch, Albert; Val, Laura del; Luquot, Linda; Martinez-Perez, Laura; Bellmunt, F.; Lay, Hugo Le; Rodellas, Valentí; Ferrer, Núria; Palacios, Andrea; Fernandez, Sheila; Marazuela, Miguel Ángel; Diego-Feliu, Marc; Pool, M.; Goyetche, Tybaud; Ledo, Juanjo; Pézard, Philippe; Bour, Olivier; Queralt, Pilar; Marcuello, Álex; García-Orellana, Jordi; Saaltink, Maarten W.; Vázquez-Suñé, Enric; Carrera, Jesús

doi:10.1016/j.jhydrol.2020.125050

Cited by 37 publications

(28 citation statements)

References 61 publications

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“…The proposed approach for heat dissipation tests with FO‐DTS at field scale was tested at the experimental site of MEDISTRAES (Folch et al., 2020). The experimental site is located in the alluvial aquifer of the Riera Argentona 40 km North from the city of Barcelona (Spain), between Catalan Littoral Mountain Range and Mediterranean Sea.…”

Section: Problem Statement and Solutionmentioning

confidence: 99%

Heat Dissipation Test With Fiber‐Optic Distributed Temperature Sensing to Estimate Groundwater Flux

Val

Carrera

Pool

et al. 2021

Water Resources Research

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We measure groundwater flux and thermal parameters around a borehole performing a heat dissipation test by heating the armor of a single fiber‐optic cable and interpreting the resulting heating curves with a new analytical method. The procedure is similar to thermal response tests, but benefitting from the high spatial and temporal resolution of distributed temperature sensing and lasting longer, so as to measure advective dissipation. Field installation relies on an innovative method in hydrogeology, which is based on the installation of the FO cable in the annular space of the well, close to the aquifer matrix. The proposed new analytical method, expands the traditional Moving Infinitesimal Line Source Model to account for the effects of the field set up and cable materials. In fact, we show that the resulting temperature build‐up goes through four periods easy to identify using the log derivative of temperature (dT/d (ln(t))): Initial response, skin (cable insulation), conduction dominated and advection dominated. We test the proposed method in an unconsolidated shallow aquifer with controlled pumping. Results are of the same order of magnitude of independent estimates of groundwater velocity.

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Section: Problem Statement and Solutionmentioning

confidence: 99%

Heat Dissipation Test With Fiber‐Optic Distributed Temperature Sensing to Estimate Groundwater Flux

Val

Carrera

Pool

et al. 2021

Water Resources Research

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“…Moreover, the time domain electromagnetic method (TDEM) has been widely employed as a characterization method to delineate the salinization of coastal aquifers with good results at large-scale areas [44][45][46][47][48], while only an example of airborne electromagnetics methods (AEM) has been present [49] due to the high cost of instrumentation and survey. Finally, a new downhole probe subsurface monitoring device (SMD) has been developed to monitor in real time the resistivity variations along a monitoring well profile via a cable loaded with electrodes [50] or via coupled fiber optics and ERT techniques [51].…”

Section: Methodological Approaches For Groundwater Salinization Delinmentioning

confidence: 99%

The Issue of Groundwater Salinization in Coastal Areas of the Mediterranean Region: A Review

Mastrocicco

Colombani

2021

Water

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The Mediterranean area is undergoing intensive demographic, social, cultural, economic, and environmental changes. This generates multiple environmental pressures such as increased demand for water resources, generation of pollution related to wastewater discharge, and land consumption. In the Mediterranean area, recent climate change studies forecast large impacts on the hydrologic cycle. Thus, in the next years, surface and ground-water resources will be gradually more stressed, especially in coastal areas. In this review paper, the historical and geographical distribution of peer-review studies and the main mechanisms that promote aquifer salinization in the Mediterranean area are critically discussed, providing the state of the art on topics such as actual saltwater wedge characterization, paleo-salinities in coastal areas, water-rock interactions, geophysical techniques aimed at delineating the areal and vertical extent of saltwater intrusion, management of groundwater overexploitation using numerical models and GIS mapping techniques for aquifer vulnerability to salinization. Each of the above-mentioned approaches has potential advantages and drawbacks; thus, the best tactic to tackle coastal aquifer management is to employ a combination of approaches. Finally, the number of studies focusing on predictions of climate change effects on coastal aquifers are growing but are still very limited and surely need further research.

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“…These studies suggest that beaches that overly paleochannels and low permeability caps may contain flow patterns that are not representative of a non-channelized coastline. Electrical resistivity tomography [54], time-domain electromagnetic surveys [55], seismic profiles [27], temperature surveys [56], and combinations of geophysical methods [57] of the nearshore area can provide valuable guidance during site selection to reduce the likelihood of instrumenting a site with largescale geologic features that could otherwise lead to inaccurate interpretations of measured parameters. Therefore, it is important to identify and, if present, characterize the underlying major geologic features.…”

Section: Approaches For Characterizing Beach Geologymentioning

confidence: 99%

Methods in Capturing the Spatiotemporal Dynamics of Flow and Biogeochemical Reactivity in Sandy Beach Aquifers: A Review

Kim

Heiss

2021

Water

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Sandy beach aquifers are complex hydrological and biogeochemical systems where fresh groundwater and seawater mix. The extent of the intertidal mixing zone and the rates of circulating flows within beaches are a primary control on porewater chemistry and microbiology of the intertidal subsurface. Interplay between the hydrological and biogeochemical processes at these land-sea transition zones moderate fluxes of chemicals, particulates, heavy metals, and biota across the aquifer-ocean interface, affecting coastal water quality and nutrient loads to marine ecosystems. Thus, it is important to characterize hydrological and biogeochemical processes in beach aquifers when estimating material fluxes to the ocean. This can be achieved through a suite of cross-disciplinary measurements of beach groundwater flow and chemistry. In this review, we present measurement approaches that have been developed and employed to characterize the physical (geology, topography, subsurface hydrology) and biogeochemical (solute and particulate distributions, reaction rates) properties of and processes occurring within sandy intertidal aquifers. As applied to beach systems, we discuss vibracoring, sample collection, laboratory experiments, variable-density considerations, instrument construction, and sensor technologies. We discuss advantages and limitations of typical hydrologic field sampling methods when used to investigate beach aquifers and provide a measurement framework for researchers seeking to sample and collect data from these systems.

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Combining fiber optic DTS, cross-hole ERT and time-lapse induction logging to characterize and monitor a coastal aquifer

Cited by 37 publications

References 61 publications

Heat Dissipation Test With Fiber‐Optic Distributed Temperature Sensing to Estimate Groundwater Flux

Heat Dissipation Test With Fiber‐Optic Distributed Temperature Sensing to Estimate Groundwater Flux

The Issue of Groundwater Salinization in Coastal Areas of the Mediterranean Region: A Review

Methods in Capturing the Spatiotemporal Dynamics of Flow and Biogeochemical Reactivity in Sandy Beach Aquifers: A Review

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