Resolving electrolayers from VES: A contribution from modeling the electrical response of a tightly constrained alluvial stratigraphy

Mele, M.; Ceresa, Niccolò; Bersezio, R.; Giudici, M.; Inzoli, S.; Cavalli, E.

doi:10.1016/j.jappgeo.2015.05.002

Cited by 6 publications

(9 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, the results obtained at the key-sectors showed, as a whole, that a hierarchical structure of the EsUs emerges when exploring a sedimentary sequence; this structure is independent of any calibration between each VES and the lito-stratigraphy of a neighbouring 1-D borehole (Mele et al , 2013(Mele et al , 2015.…”

mentioning

confidence: 94%

“…After a set of studies dedicated to improve and test the detailed resistivity imaging of the Po basin subsurface at the local scale (Bersezio et al 2007;Mele et al , 2013Mele et al , 2015, we now apply this approach to a wide scale casestudy, that is the electrostratigraphy of a regional N-S cross-section across the Quaternary Po foreland basin in Northern Italy, East and South of Milan. The tectono-sedimentary setting of the basin is recorded by alluvial and glacio-fluvial clastic, regressive depositional systems, which prograde above shallow marine sediments, under the control of Pleistocene glacial cycles and Apennine-related tectonics.…”

Section: Introductionmentioning

confidence: 99%

“…Within a N-S strip across the central Po basin (Fig. 1) we formerly studied three fine-scale, key-sectors where we extensively acquired resistivity data with Vertical Electrical Soundings (VES; Mele et al 2102Mele et al , 2013Mele et al , 2015. Our approach portrayed subsurface volumes of sediments that we informally named "Electrostratigraphic Units" (EsUs).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An electrostratigraphic cross-section across the central Po plain: bearings on subsurface geology and hydrostratigraphy

Mele

Bersezio

Giudici

2018

Int J Earth Sci (Geol Rundsch)

Self Cite

View full text Add to dashboard Cite

A 72-kilometers-long N-S cross-section was surveyed with Direct Current resistivity soundings through the Quaternary clastic infill of the Apennine foredeep in the Po plain of Lombardy (Northern Italy). The aims are: 1) to test the potential of DC resistivity methods at the regional scale; 2) to draw the electrostratigraphic picture of the basin fill, down to the pre-Quaternary substratum; 3) to refine and test the methodology and concepts of hierarchic electrostratigraphy at the basin scale; 4) to contribute to characterize the regional hydrostratigraphy of a relevant hydrogeological basin. 163 resistivity-versus-depth profiles with a maximum investigation depth of 450 m were obtained from Vertical Electrical Soundings. To draw the electrostratigraphic cross-section, the polarity of the resistivity contrast across resistivity interfaces (i.e., resistive over conductive layers or vice-versa) was considered and the discontinuities were correlated according to the persisting pattern form North to South. Doing so, the hierarchic assemblage of four major electrostratigraphic boundaries and the five intervening Groups of Electrostratigraphic Units (EsUs) was established. The resulting picture was compared to the available subsurface reconstructions from 2 literature, using the 1-D borehole data only to check the geophysical image at some random sample sites. The results show that the electrostratigraphic picture captures the geological and hydrostratigraphic complexity of the subsurface of the basin comparing well with the available direct subsurface geological and hydrostratigraphic reconstructions. At the regional scale of the cross-section, two hierarchic orders of EsUs and correlative boundaries could be drawn (1 st order Groups and 2 nd order individual EsUs), while the lowermost 3 rd order rank, the electrolayer, is recognised at the single VES sites only.

show abstract

mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An electrostratigraphic cross-section across the central Po plain: bearings on subsurface geology and hydrostratigraphy

Mele

Bersezio

Giudici

2018

Int J Earth Sci (Geol Rundsch)

Self Cite

View full text Add to dashboard Cite

show abstract

“…From these data, other textural parameters were calculated: the characteristic diameters

d_{10}, d_{30}, d_{50}, d_{60}

and

d_{90}

that indicate the grain diameter at 10%, 30%, 50%, 60%, and 90% passing, respectively; the uniformity coefficients

U_{60}

and

U_{90}

, which were calculated as the ratio between

d_{60}

and

d_{10}

and

d_{90}

and

d_{10}

, respectively, and the curvature coefficient

U_{c}

calculated as

U_{c} = \frac{d_{30}^{2}}{d_{10} d_{60}};

the coarse‐to‐fine ratios

Γ_{d}

with threshold grain diameters

d

equal to 0.125 and 0.250 mm (Mele, Bersezio, and Giudici ; Mele et al . , ). …”

Section: Methodsmentioning

confidence: 99%

“…• the coarse-to-fine ratios Γ d with threshold grain diameters d equal to 0.125 and 0.250 mm (Mele, Bersezio, and Giudici 2012;Mele et al 2014Mele et al , 2015. Furthermore, the porosity of each sample was estimated from the water content at full saturation.…”

Section: Materials and Methods Sample Characteristicsmentioning

confidence: 99%

Estimation of sediment texture from spectral induced polarisation data using cluster and principal component analysis

Inzoli

Giudici

Huisman

2016

Near Surface Geophysics

View full text Add to dashboard Cite

Spectral induced polarisation data are usually interpreted with simple models in order to derive petrophysical relationships between electrical and sedimentological properties, such as texture, clay content, and permeability. The aim of this work is to explore the value of spectral induced polarisation in addition to conventional direct‐current resistivity measurements for determining textural properties of saturated samples collected from alluvial deposits. For this, an advanced data processing approach that combines cluster and principal component analysis was developed and applied to integral parameters derived from Debye decomposition of spectral induced polarisation data. This data processing procedure allowed identifying groups of samples with a similar spectral induced polarisation response and to derive a characteristic grain‐size distribution for each group of samples. The method to estimate the grain‐size distribution from spectral induced polarisation data was successfully validated using independent sediment samples. The remaining uncertainty in the estimation of sediment texture from spectral induced polarisation data was attributed to the effect of pore size distribution and mineralogy, which were not considered in the present work but can be added in the future within the same conceptual workflow.

show abstract

Vertical electric soundings characteristics of paleochannel in the Yuyao River Valley, Eastern China

Zhao

Yang

et al. 2020

Bull Eng Geol Environ

View full text Add to dashboard Cite

Resolving electrolayers from VES: A contribution from modeling the electrical response of a tightly constrained alluvial stratigraphy

Cited by 6 publications

References 25 publications

An electrostratigraphic cross-section across the central Po plain: bearings on subsurface geology and hydrostratigraphy

An electrostratigraphic cross-section across the central Po plain: bearings on subsurface geology and hydrostratigraphy

Estimation of sediment texture from spectral induced polarisation data using cluster and principal component analysis

Vertical electric soundings characteristics of paleochannel in the Yuyao River Valley, Eastern China

Contact Info

Product

Resources

About