Understanding the hydrogeology of the Venice Lagoon subsurface with airborne electromagnetics

Teatini, Pietro; Tosi, Luigi; Viezzoli, Andrea; Baradello, Luca; Zecchin, Massimo; Silvestri, S.

doi:10.1016/j.jhydrol.2011.10.017

Cited by 43 publications

(30 citation statements)

References 42 publications

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“…With the recent improvements in airborne electromagnetics (AEM) Steuer et al, 2009), electromagnetic methods have become even more advantageous to geological and hydrogeological mapping (e.g. Rumpel et al, 2009;Sandersen et al, 2009;Høyer et al, 2011;Teatini et al, 2011). However, borehole geophysics provides important data for the corroboration and interpretation of seismic (Rasmussen, 2009;Scharling et al, 2009) and AEM surveys (Mullen and Kellett, 2007), e.g.…”

Section: Introductionmentioning

confidence: 99%

“…TEM measures the induced or secondary electromagnetic field owing to the diffusion of the eddy currents in the ground after the turn-off of the source current. This inductive response of the ground makes TEM methods well-suited for detecting conductive layers where eddy currents are stronger, such as groundwater-saturated formations (Auken and Sørensen, 2003;Viezzoli et al, 2010), and even more so when formations are saturated with saltwater (Fitterman and DeszczPan, 2004;Auken et al, 2010b;Kafri and Goldman, 2005;Kirkegaard et al, 2011;Kok et al, 2010;Teatini et al, 2011). Clay content also increases the conductivity, which makes interpretations less than straightforward and calls for the use of supplementary information from other sources such as well logging (Buckley et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Transboundary geophysical mapping of geological elements and salinity distribution critical for the assessment of future sea water intrusion in response to sea level rise

Jørgensen

Scheer

Thomsen

et al. 2012

Hydrol. Earth Syst. Sci.

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Abstract. Geophysical techniques are increasingly being used as tools for characterising the subsurface, and they are generally required to develop subsurface models that properly delineate the distribution of aquifers and aquitards, salt/freshwater interfaces, and geological structures that affect groundwater flow. In a study area covering 730 km2 across the border between Germany and Denmark, a combination of an airborne electromagnetic survey (performed with the SkyTEM system), a high-resolution seismic survey and borehole logging has been used in an integrated mapping of important geological, physical and chemical features of the subsurface. The spacing between flight lines is 200–250 m which gives a total of about 3200 line km. About 38 km of seismic lines have been collected. Faults bordering a graben structure, buried tunnel valleys, glaciotectonic thrust complexes, marine clay units, and sand aquifers are all examples of geological structures mapped by the geophysical data that control groundwater flow and to some extent hydrochemistry. Additionally, the data provide an excellent picture of the salinity distribution in the area and thus provide important information on the salt/freshwater boundary and the chemical status of groundwater. Although the westernmost part of the study area along the North Sea coast is saturated with saline water and the TEM data therefore are strongly influenced by the increased electrical conductivity there, buried valleys and other geological elements are still revealed. The mapped salinity distribution indicates preferential flow paths through and along specific geological structures within the area. The effects of a future sea level rise on the groundwater system and groundwater chemistry are discussed with special emphasis on the importance of knowing the existence, distribution and geometry of the mapped geological elements, and their control on the groundwater salinity distribution is assessed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transboundary geophysical mapping of geological elements and salinity distribution critical for the assessment of future sea water intrusion in response to sea level rise

Jørgensen

Scheer

Thomsen

et al. 2012

Hydrol. Earth Syst. Sci.

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“…Therefore, c = 0 and c = 0.7 below and above the top of the sealing layer, respectively. The latter value was obtained based on the data published in Teatini et al (2011). Concerning the boundary conditions, ∂c/∂n = 0 was prescribed along the lateral and bottom boundaries, with c = 1, i.e., the seawater concentration, imposed on the nodes corresponding to the lagoon and MVC bottom.…”

Section: Density-dependent Interactionsmentioning

confidence: 99%

“…1b) specifically drilled for the study allowed us to sketch the hydro-stratigraphic setting of the lagoon subsoil along the MVC designed trace. In addition, a variety of geophysical, lithological, sedimentological, and geotechnical information available from previous investigations (Fabbri et al, 2013;Madricardo and Donnici, 2014;Teatini et al, 2011;Tosi et al, 2007Tosi et al, , 2011Zecchin et al, 2011Zecchin et al, , 2014 was reprocessed to characterize the architecture of the deeper deposits (down to a depth of approximately 50 m b.m.s.l.) and contextualize the investigated area within a regional hydrogeological framework.…”

Section: Introductionmentioning

confidence: 99%

Hydrogeological effects of dredging navigable canals through lagoon shallows. A case study in Venice

Teatini

Isotton²,

Nardean

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. For the first time a comprehensive investigation has been carried out to quantify the possible effects of dredging a navigable canal on the hydrogeological system underlying a coastal lagoon. The study is focused on the Venice Lagoon, Italy, where the port authority is planning to open a new 10 m deep and 3 km long canal to connect the city passenger terminal to the central lagoon inlet, thus avoiding the passage of large cruise ships through the historic center of Venice. A modeling study has been developed to evaluate the short (minutes), medium (months), and long (decades) term processes of water and pollutant exchange between the shallow aquifer system and the lagoon, possibly enhanced by the canal excavation, and ship wakes. An in-depth characterization of the lagoon subsurface along the channel has supported the numerical modeling. Piezometer and sea level records, geophysical acquisitions, laboratory analyses of groundwater and sediment samples (chemical analyses and ecotoxicity testing), and the outcome of 3-D hydrodynamic and computational fluid dynamic (CFD) models have been used to set up and calibrate the subsurface multi-model approach. The numerical outcomes allow us to quantify the groundwater volume and estimate the mass of anthropogenic contaminants (As, Cd, Cu, Cr, Hg, Pb, Se) likely leaked from the nearby industrial area over the past decades, and released into the lagoon from the canal bed by the action of depression waves generated by ships. Moreover, the model outcomes help to understand the effect of the hydrogeological layering on the propagation of the tidal fluctuation and salt concentration into the shallow brackish aquifers underlying the lagoon bottom.

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“…Santos and El-Kaliouby [10] developed an algorithm for laterally constrained joint inversion of electro resistivity (ER) and TEM data to calculate quasi-2D geological models. Teatini et al [11], conducted surveys with airborne TEM to analyze the hydrogeological setting of a transitional coastal environment in Venice, Italy. The data acquired were inverted as laterally constrained 1D sounding inversions providing a quasi-2D analysis.…”

Section: Introductionmentioning

confidence: 99%

2D TEM Modeling for a Hydrogeological Study in the Paraná Sedimentary Basin, Brazil

Almeida¹,

Porsani²,

Santos³

et al. 2017

IJG

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This work uses 2D TEM (Transient Electromagnetic) modeling for a hydrogeological study in the Paraná sedimentary basin. The study area is located at the northern region of the state of São Paulo, Brazil, where groundwater is exploited from two aquifer systems: one sedimentary, shallow, and the other crystalline, deep. The interest in applying the TEM method in this area owes to the high exploitation rates of groundwater from the crystalline aquifer system for irrigation, which is triggering considerable seismic activity locally. This aquifer system is composed of fractured basalt within the Serra Geral Formation and is about 120 m deep. Eighty-six TEM soundings were acquired at this location, but in nine cases the data did not fit the modelled curve for 1D geoelectrical models due to the geological complexity of the area. This paper shows 2D geoelectrical modeling results based on the FDTD (Finite Differences in Time Domain) method to explain the lateral resistivity variation within the geological setting. A 2D model was generated for each sounding and compared with 1D inversion models as well as with direct information from wells. The results show some vertical variations of about 10 to 30 meters on the upper interface of the basalt layer from Serra Geral Formation. They are located at approximately 60 meters from the center of the soundings. The existence of these 2D structures in the subsurface can be related to the drainage system in the study area. The presence of these structures may indicate a connection between the shallow and deep aquifer systems, acting like a conduit that may contribute to the seismic activity reported.

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Understanding the hydrogeology of the Venice Lagoon subsurface with airborne electromagnetics

Cited by 43 publications

References 42 publications

Transboundary geophysical mapping of geological elements and salinity distribution critical for the assessment of future sea water intrusion in response to sea level rise

Transboundary geophysical mapping of geological elements and salinity distribution critical for the assessment of future sea water intrusion in response to sea level rise

Hydrogeological effects of dredging navigable canals through lagoon shallows. A case study in Venice

2D TEM Modeling for a Hydrogeological Study in the Paraná Sedimentary Basin, Brazil

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Understanding the hydrogeology of the Venice Lagoon subsurface with airborne electromagnetics

Cited by 43 publications

References 42 publications

Transboundary geophysical mapping of geological elements and salinity distribution critical for the assessment of future sea water intrusion in response to sea level rise

Transboundary geophysical mapping of geological elements and salinity distribution critical for the assessment of future sea water intrusion in response to sea level rise

Hydrogeological effects of dredging navigable canals through lagoon shallows. A case study in Venice

2D TEM Modeling for a Hydrogeological Study in the Paran&#225; Sedimentary Basin, Brazil

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2D TEM Modeling for a Hydrogeological Study in the Paraná Sedimentary Basin, Brazil