Assessment of an ancient bridge combining geophysical and advanced photogrammetric methods: Application to the Pont De Coq,France |
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| Institution: | 1. Centre d''Études Techniques de l''Équipement - Normandie Centre, ERA23, Université de Rouen, 10 chemin de la Poudrière, CS 90245, 76121 Le Grand Quevilly, France;2. Centre d''Études Techniques de l''Équipement - Normandie Centre, DADT, Université de Rouen, 10 chemin de la Poudrière, CS 90245, 76121 Le Grand Quevilly, France;3. Centre d''Études Techniques de l''Équipement - Normandie Centre, ERA44, 11 rue Laplace, CS 2912, 41029 Blois France;4. Laboratoire ECODIV, Institut de Recherche et d''Enseignement en Sciences de l''Environnement, Université de Rouen, Place Emile Blondel, F-76821 Mont Saint Aignan Cedex, France;5. Direction Régionale des Affaires Culturelles - Haute Normandie, Conservation Régionale des Monuments Historiques, 7 Place de la Madeleine, 76000 Rouen, France;6. Laboratoire de Morphodynamique Continentale et Côtiére, UMR 6143-CNRS, Université de Rouen, Place Emile Blondel, F-76821 Mont Saint Aignan Cedex, France;7. École Nationale des Sciences Géographiques, 6 et 8 Avenue Blaise Pascal, Cité Descartes, Champs-sur-Marne, 77455 Marne la Vallée, Cedex 2, France;1. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. China University of Geosciences, Beijing 100083, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;1. Hanyang University, Seoul, Republic of Korea;2. Korea Institute of Geoscience and Mineral Resources, Daejeon, Republic of Korea;1. Laboratoire LETG-CAEN GEOPHEN, Géographie Physique et Environnement, CNRS UM5 6554, Université de Caen-Basse-Normandie, Esplanade de la Paix, F-14032 Caen Cedex, France;2. Institut de Physique du Globe de Strasbourg, CNRS UMR 7516, École et Observatoire des Sciences de la Terre, EOST/Université de Strasbourg, 5 rue Descartes, F-67084 Strasbourg, France;3. Bureau de Recherches Géologiques et Minières, 3 Avenue C. Guillemin, F-45000 Orléans, France;4. Institut Français des Sciences et Technologies des Transports, de l''Aménagement et des Réseaux, Département GERS — Géotechnique, Environnement, Risques naturels et Sciences de la terre, 14-20 Boulevard Newton, F-77447 Marne la Vallée Cedex 2, France |
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| Abstract: | A high resolution geophysical survey was carried out on the Pont De Coq, a medieval stone arch bridge located in Normandy (France) in 2011 and 2012. Two complementary methods are used: Electrical Resistivity Tomography (ERT) and Ground PenetratingRadar (GPR). They allow to evaluate the structural state of the bridge and to characterize the subsurface around and beneath the bridge. An excellent correlation is obtained between the geophysical methods and the geological data obtained around the bridge. In order to improve the restitution of the geophysical data, an advanced photogrammetric method is performed, providing a high resolution 3D Digital Terrain Model (DTM) of the Pont de Coq. The advanced photogrammetry enhances the presentation of the GPR and ERT data. This approach is an easy-to-use, rapid and cost-effective tool for stakeholders. Finally, it is a promising and original method for improved interpretations of future geophysical surveys. |
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