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Ancient aqueduct carbonates: accurate archives of the environment and archaeological events

Subject Area Palaeontology
Classical, Roman, Christian and Islamic Archaeology
Term from 2019 to 2024
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 434934785
 
Final Report Year 2025

Final Report Abstract

This study explored aqueduct carbonate deposits (CaCO3) from four Roman aqueducts in connection with civilization centres of the Roman Empire in France (Nîmes, Arles, Bellegarde, Cahors). We found that such carbonate deposits can give a wealth of information in archaeology, and additional data on environmental conditions during Roman time. Observations of carbonate from the Roman aqueduct of Cahors have shown, that environmental data are stored in such deposits, and that data on annual temperature, spring discharge (and indirectly precipitation) can be retrieved with an up to daily resolution. It is clear however, that aqueducts were a controlled environment, and that it is necessary to recognize and understand anthropogenic effects in the deposits before reliable environmental data can be retrieved. An important part of the project time was therefore focussed on the archaeological interpretation of the deposits, especially those of the Roman aqueduct of Cahors and Arles. Proof for cleaning operations and their frequency was documented in Cahors (Divona), proved late antiquity restoration of the Roman aqueduct of Arles by Constantine the Great in Arles, and documented 200 years of climatic variation in Nîmes.

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