Geophysical investigations for the location of the Heptastadium in Alexandria (Egypt)

“…For electrical resistivity investigations, the electrostatic method where both the injection and the measurements are performed by open capacitors constitute an attractive alternative method (Tabbagh et al, 1993;Kuras et al, 2006). It has been used with success in towns for archaeology with urban pattern recognitions (Hesse et al, 2002) or ancient building studies (Dabas et al, 2000;Flageul et al, 2013) and civil engineering applications (Burton, 2011;Loke et al, 2013).…”

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confidence: 99%

Determination of the resistivity distribution along underground pipes in urban contexts using galvanic and capacitive methods

Rejkjær

Finco²,

Schamper³

et al. 2020

Near Surface Geophysics

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Renovation of water and central heating pipelines is a very costly and time‐consuming process; therefore, a way to prioritize the limited resources between different parts of the systems is very important. The risk for corrosion damage can be assessed from the resistivity of the ground, because the processes facilitating the metal oxidation also affect the resistivity. However, galvanic resistivity mapping is time consuming and work‐intensive in paved areas. To determine the resistivity in the vicinity of pipes two different resistivity methods were applied: electrical resistivity tomography using galvanic coupling, and the logistically easier and rapid electrostatic measurements using capacitive coupling. The two methods were tested in a series of experiments undertaken in the province of Scania in southern Sweden with the aim to acquire a better knowledge about the electrical resistivity of the soil surrounding the heating and water distribution pipes, in order to better assess the corrosivity of the environment. From the experiments it is shown that the electrical resistivity tomography and electrostatic methods mostly give comparable results for the shallow investigated depths in focus here, where differences might be caused by different sensitivities and noise characteristics. In the case of both methods, it is shown, with the help of modelling of the different expected ground models including the pipes, that the pipes only influence the data in cases of pipes of very large diameters or those buried at a very shallow depth, even without any protective surface coating. The missing influence of the pipes on the data makes the methods very applicable for knowing the resistivity of the soil surrounding the pipes and thus evaluation of corrosion risk.

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Shallow geophysical investigations at the Akhmim archaeological site, Suhag, Egypt

et al. 2008

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Ground penetrating radar, electromagnetic terrain conductivity, and electric tomography have proven to be effective tools if they are combined together to investigate archeological sites. We have conducted a geophysical survey at the Akhmim archaeological site, the main objective of our survey is to locate additional buried structures for further excavation. Geophysical data were acquired in the area using the GEM-300 multi-frequency terrain conductivity profiler, the SIR 2000 ground penetrating radar, and the Syscal R2 resistivity meter systems. The results of the integrated interpretation show a number of buried features and a strong linear zone about 1 m wide that coincides with the suspected trend of a buried wall. There appears to be two parallel ridges of strong refl ections on either side, indicating two parallel walls extended East-West and a room is identifi ed at the bottom left corner of the site. Moreover, the interpretation results of some selected GPR and dipoledipole resistivity profi les adjacent to the open-air museum suggest the existence of a second statue of Ramses II to the right of the previously discovered statue which could still be buried in the sand.

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Geophysical investigations for the location of the Heptastadium in Alexandria (Egypt)

Cited by 7 publications

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Geophysical investigation of the Temple of Apollo (Hierapolis, Turkey)

Geophysical investigation of the Temple of Apollo (Hierapolis, Turkey)

Determination of the resistivity distribution along underground pipes in urban contexts using galvanic and capacitive methods

Shallow geophysical investigations at the Akhmim archaeological site, Suhag, Egypt

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