Venice channel side-wall assessment with GPR technique—a case study

Francese, Roberto; Galgaro, Antonio; Grespan, A.

doi:10.1016/j.jappgeo.2004.03.001

Cited by 10 publications

(7 citation statements)

References 9 publications

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“… Where uncertainty exists relating to the identity of the features then future work is needed to consider linking the presence of anomalies with additional datasets such as LiDar, X-ray [31], thermal imaging [7] and ultrasonic [32,33].  The 1.2GHz antenna was proven as a tool for investigations deep within the wall, whilst the 2.3GHz demonstrated a capacity for providing highly detailed analysis of the features present within the near surface material.…”

Section: Discussionmentioning

confidence: 99%

Detecting voids within a historical building façade: A comparative study of three high frequency GPR antenna

Johnston

Ruffell

McKinley

et al. 2018

Journal of Cultural Heritage

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Ground penetrating radar is becoming an established component of the stone conservation researcher's arsenal. There is great potential in this quick and non-destructive technique that provides confirmation of deterioration features, such as voids, whose presence has been suggested using other tools. The past application of this technology has focused upon block scale stone deterioration, with less attention given to the study of features that extend across multiple blocks within the walls. The aim of this paper was to primarily to demonstrate the suitability of GPR for identifying void spaces when run across a rough surfaced wall façade. Additionally, this work aims to aid in the application of GPR for this purpose, by providing a comparison of three commonly used antennas to inform equipment choice during survey design. For this study, three high frequency antennas, 1.2GHz, 1.6GHz and 2.3 GHz, were run along the same perpendicular test lines across multiple blocks within a historical building façade. The resultant reflection profiles demonstrated that GPR can identify the presence of features within the blocks when run across a rough wall section. However, without the use of additional information from secondary data sources it is not possible to confirm the identity of features. The comparison of the three antennas, showed that the 1.6GHz antenna was the least suited for this task, due to the presence of extensive ringing in the resultant reflection profiles. Alternatively, the 1.2GHz antenna is most suitable for investigations deep within the wall and the 2.3GHz better suits highly detailed analysis of features present within the near surface material. The choice of the most appropriate antenna depends upon the nature of the task it will be deployed for.

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Section: Discussionmentioning

confidence: 99%

Detecting voids within a historical building façade: A comparative study of three high frequency GPR antenna

Johnston

Ruffell

McKinley

et al. 2018

Journal of Cultural Heritage

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“…This noise appeared to be either coupling- or electronic-dependent (Seppi and others, 2015). The standard running average filter (Daniels, 1996; Francese and others, 2004) was not effective at removing these high-amplitude bands. An automatic routine was therefore coded for removing this specific noise.…”

Section: Methodsmentioning

confidence: 98%

Geophysical signature of a World War I tunnel-like anomaly in the Forni Glacier (Punta Linke, Italian Alps)

et al. 2019

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Global warming and the associated glacier retreat recently revealed the entrance to an ice–rock tunnel, at an altitude of ~3600 m a.s.l., in the uppermost portion of the Forni Glacier in the Central Italian Alps. The tunnel served as an entrance to an Austro-Hungarian cableway station excavated in the rocks during the Great War just behind the frontline. A comprehensive geophysical survey, based on seismic and ground-penetrating radar profiling, was then undertaken to map other possible World War I (WWI) remains still embedded in the ice. The ice–rock interface was reconstructed over the entire saddle and in the uppermost portion of the glacier. A prominent linear reflector was surprisingly similar to the common response of buried pipes. The reflector orientation, almost longitudinal to the slope, does not seem to be compatible with a glacial conduit or with other natural features. Numerical simulations of a series of possible targets constrained interpretation to a partly water-filled rounded shape cavity. The presence of a preserved WWI tunnel connecting Mount Vioz and Punta Linke could be considered a realistic hypothesis. The Forni glacier could be still considered polythermal and comprised of cold ice without basal sliding in its top portion.

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“…The time series were processed using ad hoc modules (Francese et al , ) coded in the open‐source environment of the CWP‐SU (Colorado School of Mines/Centre for Wave Phenomena – Seismic Unix) package (Stockwell and Cohen, ). Particular effort was devoted to the removal of the horizontal banding (Francese et al , ) using a moving‐average filter.…”

Section: Methodsmentioning

confidence: 99%

“…This caused poor antenna coupling (Stockwell and Cohen, 2008). Particular effort was devoted to the removal of the horizontal banding (Francese et al, 2004) using a moving-average filter.…”

Section: Multichannel Ground-penetrating Radar (Gpr)mentioning

confidence: 99%

The Roman City of Altinum, Venice Lagoon, from Remote Sensing and Geophysical Prospection

Mozzi

Fontana

Ferrarese

et al. 2015

Archaeological Prospection

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Geophysical prospection on 14 ha integrates the processing and interpretation of vertical multispectral and oblique\ud aerial images for uncovering the archaeology of the Roman city of Altinum. This Iron Age and Roman harbour city\ud was completely abandoned in the early Middle Ages, when people moved to nearby lagoon islands, and so the site\ud is particularly fit for the application of non-invasive techniques. Primary aims of the research were to test the interpretation\ud of archaeological structures in the city centre, estimate their degree of preservation in the subsoil, and update\ud previous knowledge on the urban landscape. Target areas were identified first through remote sensing with later\ud magnetic gradiometer mapping of the consular road (via Annia) and its adjoining streets, foundations of large buildings,\ud theatres, temple and forum, a main canal with possible boatyard/storing place and workshops. Multi-electrode\ud automatic resistivity profile produced a very detailed survey of the little theatre (odeon) and basilica. The groundpenetrating\ud radar traced the city walls, while frequency-domain electromagnetics mapped the street pattern.\ud Buried archaeological structures were located with an estimated error < 0.5 m. Floors and foundations of Roman\ud buildings and infrastructures appear to be preserved between 0.5 and 2 m depth. They probably relate to a reorganization\ud of the city, which occurred between the second half of the second century and the end of the first century\ud BC, having via Annia and the forum as the main city axis, and incorporating few elements of the Iron Age settlement,\ud such as the canal and city boundary. Eight city districts could be recognized, each one showing prevalent public,\ud residential and other productive functions. In the ancient past the monumental buildings of the city were potentially\ud visible from ships in the Adriatic Sea, and could act as nautical signals of the entrance to the lagoon along this low\ud and otherwise monotonous coast. Copyright © 2015 John Wiley & Sons, Ltd

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Venice channel side-wall assessment with GPR technique—a case study

Cited by 10 publications

References 9 publications

Detecting voids within a historical building façade: A comparative study of three high frequency GPR antenna

Detecting voids within a historical building façade: A comparative study of three high frequency GPR antenna

Geophysical signature of a World War I tunnel-like anomaly in the Forni Glacier (Punta Linke, Italian Alps)

The Roman City of Altinum, Venice Lagoon, from Remote Sensing and Geophysical Prospection

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