A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
3D geostatistical modeling of Lascaux hill from ERT data
https://orcid.org/0000-0002-7388-4404
Abstract The Lascaux cave, located in southwest France, is one of the most important prehistoric caves in the world that show Paleolithic paintings. This study aims to simulate the 3D geological environment of the cave by geostatistical modeling based on 2D Electrical Resistivity Tomography (ERT) data. Seventeen ERT profiles were carried out resulting in 64,195 geolocated resistivity values, covering about 14,500m2 of the Lascaux site. From this dataset, 3D resistivity geo-model has been built by geostatistical method. We used geotechnical data from 36 boreholes and cone penetrometer tests to validate the geo-model. By modeling from 2D data, we can establish a good estimation of the 3D geological environment of the Lascaux site. Our results show that the site can be generally separated in two parts: the limestone promontory in the center and the detrital formations located in both east and west sides. There is a high contrast between resistivity of the two formations: 45Ω·m (detrital formation) to 556Ω·m (limestone) with a rough boundary. In the center, the limestone could also be separate into two parts: a superficial layer of weathered limestone (150Ω·m) and a deeper layer with compact limestone (556Ω·m).
Highlights A 3D geostatistical model of Lascaux site is created by 2D ERT data. The 3D model allows to distinguish epikarstical features. Boundaries between geological formations are identified. These boundaries' locations are well fitted to other research work. The model is validated by borehole/penetrometer data.
3D geostatistical modeling of Lascaux hill from ERT data
https://orcid.org/0000-0002-7388-4404
Abstract The Lascaux cave, located in southwest France, is one of the most important prehistoric caves in the world that show Paleolithic paintings. This study aims to simulate the 3D geological environment of the cave by geostatistical modeling based on 2D Electrical Resistivity Tomography (ERT) data. Seventeen ERT profiles were carried out resulting in 64,195 geolocated resistivity values, covering about 14,500m2 of the Lascaux site. From this dataset, 3D resistivity geo-model has been built by geostatistical method. We used geotechnical data from 36 boreholes and cone penetrometer tests to validate the geo-model. By modeling from 2D data, we can establish a good estimation of the 3D geological environment of the Lascaux site. Our results show that the site can be generally separated in two parts: the limestone promontory in the center and the detrital formations located in both east and west sides. There is a high contrast between resistivity of the two formations: 45Ω·m (detrital formation) to 556Ω·m (limestone) with a rough boundary. In the center, the limestone could also be separate into two parts: a superficial layer of weathered limestone (150Ω·m) and a deeper layer with compact limestone (556Ω·m).
Highlights A 3D geostatistical model of Lascaux site is created by 2D ERT data. The 3D model allows to distinguish epikarstical features. Boundaries between geological formations are identified. These boundaries' locations are well fitted to other research work. The model is validated by borehole/penetrometer data.
3D geostatistical modeling of Lascaux hill from ERT data
https://orcid.org/0000-0002-7388-4404
Abstract The Lascaux cave, located in southwest France, is one of the most important prehistoric caves in the world that show Paleolithic paintings. This study aims to simulate the 3D geological environment of the cave by geostatistical modeling based on 2D Electrical Resistivity Tomography (ERT) data. Seventeen ERT profiles were carried out resulting in 64,195 geolocated resistivity values, covering about 14,500m2 of the Lascaux site. From this dataset, 3D resistivity geo-model has been built by geostatistical method. We used geotechnical data from 36 boreholes and cone penetrometer tests to validate the geo-model. By modeling from 2D data, we can establish a good estimation of the 3D geological environment of the Lascaux site. Our results show that the site can be generally separated in two parts: the limestone promontory in the center and the detrital formations located in both east and west sides. There is a high contrast between resistivity of the two formations: 45Ω·m (detrital formation) to 556Ω·m (limestone) with a rough boundary. In the center, the limestone could also be separate into two parts: a superficial layer of weathered limestone (150Ω·m) and a deeper layer with compact limestone (556Ω·m).
Highlights A 3D geostatistical model of Lascaux site is created by 2D ERT data. The 3D model allows to distinguish epikarstical features. Boundaries between geological formations are identified. These boundaries' locations are well fitted to other research work. The model is validated by borehole/penetrometer data.
3D geostatistical modeling of Lascaux hill from ERT data
Xu, Shan (author) / Sirieix, Colette (author) / Marache, Antoine (author) / Riss, Joëlle (author) / Malaurent, Philippe (author)
Engineering Geology ; 213 ; 169-178
2016-09-20
10 pages
Article (Journal)
Electronic Resource
English
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