1,721,031 research outputs found
SHALLOW REFLECTION SURVEY IN THE NATIONAL ARCHAEOLOGICAL PARK OF SELINUNTE (SICILY, ITALY)
No full textAssessment of salt water spreading in the Muravera coastal plain (South-western Sardinia, Italy) by means of TEM soundings
No full textSeismic reflection imaging of an ultrashallow interface from a P-wave data set with a poor signal-to-noise ratio
No full textOpere viarie: le indagini geofisiche nelle diverse fasi progettuali
No full textIn this chapter, the lack of law rules concerning the preliminary site assessment for relevant works design is analyzed. Then a rational approach based on the application of geophysical survey techniques is proposed
Integrated interpretation of IP and TEM data for salinity monitoring of aquifers and soil in the coastal area of Muravera (Sardinia, Italy)
No full textThe problem of aquifers and soil salinity is addressed in the coastal area of Muravera
(SE Sardinia, Italy) with the combined use of electrical resistivity and induced
polarization measurements along three lines, and with 41 Transient Electromagnetic
(TEM) soundings distributed in the study area. The resistivity and chargeability sections
provide a detailed information on the hydrogeological conditions in the first 20 - 60 m
depth, clarifying the role of both clay and salt water and eventually confirming the
local near-surface hydrogeological model. The resistivity maps obtained for different
depth ranges by TEM data inversion, give a clear and effective representation of
the saline contamination both laterally and down to a depth of about 70 m, over the
whole investigated area. The combination of the geophysical techniques (resistivity
tomography with Induced Polarization measurements, integrated with TEM soundings)
proves very effective as an approach for soil and water salination monitorin
Geophysical experiments for the pre-reclamation assessment of industrial and municipal waste landfills
No full textTwo examples of combined application of geophysical techniques for the pre-reclamation study of old waste landfills are illustrated. The first example concerns an old mine tailing basin where the gravity, the induced polarization (IP) and the shallow reflection seismology geophysical methods were applied. While the results provided by the IP method were substantially poor, the combination of gravity and reflection seismology proved very effective.
The second example concerns a mumicipal solid waste landfill; in this case, much more complicated than the previous one, the gravity method proved effective at least for delineating the borders of the landfill area while seismic data were properly interpreted also based on the result of a shallow excavation
The old municipal and industrial waste landfills: possible contribution of geophysical survey techniques for thir assessment before reclamation
No full textSUMMARY: In addition to the implicit environmental risk, the old abandoned waste landfills, both municipal and industrial, very often represent a serious problem since adequate information on their depth and lateral extension is very limited, when not lacking at all. Moreover the knowledge of waste consistence, presence and quality of saturating fluids, metals and so on, represents an information that cannot be neglected when designing the reclamation procedures. With the purpose of overcoming -at least partially- the above said lack of information, the possible role of
geophysical methods such as the gravity, electrical and seismic ones, and their convenience, are proposed through some examples
Medium to Shallow Depth Stratigraphic Assessment Based on the Application of Geophysical Techniques
Full text linkIn this chapter, on the basis of several case studies, we shall try and illustrate in what way geophysical techniques can contribute to the stratigraphic assessment of a site providing high-level information and contributing at least to rationally planning, if not completing avoiding at, the drilling campaign. In all cases, the primary method of investigation has been that of reflection seismology employed at different scales. However, this method was prevalently preceded by a gravity survey, which is essential for the proper design of the acquisition parameters, and accompanied by other geophysical data and direct surveys, such as drillings and exploratory excavations
Comparison between ultrashallow reflection and refraction tomography in a geotechnical case study
No full textTHE ULTRASHALLOW REFLECTION AND THE REFRACTIN TOMOGRAPHY METHODS ARE COMPARED IN AN EXPERIMENTAL SITE. THE RESULTS SEEM TO SUGGEST THAT THE REFRACTION TOMOGRAPHY COULD BE PREFERRED THANKS TO THE HIGHER LEVEL OF INFORMATIO
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