http://www.cnr.it/ontology/cnr/individuo/prodotto/ID198869

Comparison of GPR and Unilateral NMR For Water Content Measurements in a Laboratory Scale Experiment (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Comparison of GPR and Unilateral NMR For Water Content Measurements in a Laboratory Scale Experiment (Articolo in rivista) (literal)

Anno

2013-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.3997/1873-0604.2012051 (literal)

Alternative label

C.Ferrara, V. Di Tullio, P.M.Barone, E.Mattei, S.E.Lauro, N. Proietti, D.Capitani, E.Pettinelli (2013)
Comparison of GPR and Unilateral NMR For Water Content Measurements in a Laboratory Scale Experiment
in Near surface geophysics (Print)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

C.Ferrara, V. Di Tullio, P.M.Barone, E.Mattei, S.E.Lauro, N. Proietti, D.Capitani, E.Pettinelli (literal)

Pagina inizio

143 (literal)

Pagina fine

153 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

11 (literal)

Rivista

Near surface geophysics (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

11 (literal)

Note

ISI Web of Science (WOS) (literal)
Scopu (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Istituto di Metodologie Chimiche CNR Dipartimento di Fisica università di Roma Tre (literal)

Titolo

Comparison of GPR and Unilateral NMR For Water Content Measurements in a Laboratory Scale Experiment (literal)

Abstract

Several factors affect antenna-soil coupling in a Ground Penetrating Radar (GPR) survey, like surface roughness, lithology, lateral heterogeneities, vegetation, antenna height from the surface and water content. Among them, lithology and water content have a direct effect on the bulk electromagnetic properties of the material under investigation. It has been recently pointed out that the wavelet of the early-time portion of a radar signal is correlated to the shallow subsurface dielectric properties of a material. This result indicates that some information on such properties can be directly extracted from the analysis of GPR early-time traces. In the present paper, we use the early-time GPR signal, in terms of average envelope amplitude computed on the first half-cycle, to map the near-surface (few centimetres) lateral distribution of dielectric parameters, induced by changing the shallow water content on a concrete slab. This controlled experiment was specifically designed to study the effect of water content variations on antenna-material coupling, minimizing the influence of both surface roughness and heterogeneity. The quantitative control of the water in the shallow portion of the slab is performed by using a portable unilateral Nuclear Magnetic Resonance (NMR) sensor, which is able to determine the water content in the material on the basis of the measured proton density. The results show a matching pattern of the physical parameters measured with the two different techniques and a very high degree of linear correlation (r = 0.97) between the radar early-time signal average amplitude and the intensity of the NMR signal, which is proportional to the proton density, i.e., to the water content. This experiment suggests that the early-time approach could be used as a fast and high- spatial resolution tool for qualitatively mapping water content lateral variations in a porous material at shallow depth, using a ground-coupled single-offset antenna configuration and that a quantitative evaluation of the moisture content would require a calibration procedure. (literal)

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