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Subsurface

Water Solutions

Geophysical survey in Schinias pilot, in Greece (gpr surface)

Related Work Package: 2.1
Keywords : fast geophysical survey, survey with GPR

The immense archaeological number of anthropogenic constructions and ancient findings in very shallow depths ranging from 20-30 cm up to 3 m in almost all basin areas imposes one parallel fast geophysical survey to allocate free areas to install the programmed ASR demonstration site and related ancient structures. In order to speed up these works, GEOSERVICE has started in parallel one additional survey with GPR to allocate and exclude these areas. Due to the high extent of these areas, GEOSERVICE uses one fast GPR mapping with the latest equipment of MALA GEOSCIENCE the MALA Roadcart, pulled from one 4WD truck. Data are collected in real time with frequencies from 500 to 800 MHZ and georeferenced with the help of a high accuracy GPS. Depths of penetration are up to 2 m. After the first phase of scans, lower frequencies down to 100 and maybe 25 MHZ will be used in the same way to map deeper layers interfaces (up to 15 or 20 m). In general, the GPR method will be very effective up into the unsaturated zone. The upper level of the unsaturated zone is the absolute reflector of the radiated Electromagnetic Energy of the radar method and there is no possibility to collect data from below. Static seismics such as (MASW: Multichannel Analysis of Seismic Waves) or Refraction could be applied as the ultimate solution to face this geophysical problem as, both methods are not related to groundwater electrical conductivity.