Talks by Jonatan Christiansen
...Signaler un port n’implique pas les mêmes aménagements que ceux employés pour la matérialisati... more ...Signaler un port n’implique pas les mêmes aménagements que ceux employés pour la matérialisation d’une embouchure ou d’un cap. L’efficacité de la signalisation d’un port ne dépend pas de la hauteur de ces fanaux mais davantage de la précision de leur implantation. Ce sont des constructions qui appartiennent au complexe portuaire et apportent une aide au marin, après l’approche des terres, dans la phase stratégique d’entrée au port....
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Papers by Jonatan Christiansen
Les ports dans l’espace méditerranéen antique. Fréjus et les ports maritimes, 2021
Les ports dans l’espace méditerranéen antique. Fréjus et les ports maritimes / sous la dir. de Ma... more Les ports dans l’espace méditerranéen antique. Fréjus et les ports maritimes / sous la dir. de Marie-Brigitte Carre et Pierre Excoffon. Aix-en-Provence : Presses universitaires de Provence : Centre Camille Jullian, 2021. p41-52
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ABSTRACT
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Journal of Archaeological Science, Jan 1, 2014
"To the northwest of the ancient city of Ostia, the analysis of cores revealed a stratigraphic se... more "To the northwest of the ancient city of Ostia, the analysis of cores revealed a stratigraphic sequence, which we interpret as the filling of a harbour basin. This basin, located at the west of the so-called “Palazzo Imperiale” presents seven characteristics:
(1) The maximum depth is 6 m below the Roman sea level. This depth allowed any type of ship (even heavy tonnage) to access the harbour.
(2) A chronostratigraphic gap at 6 m below Roman sea level suggests digging operations in the basin (or subsequent
dredging) that have caused the loss of sedimentary archives.
(3) The filling consists of dark clays typical of a quiet environment but open to marine and river influences.
(4) The dates at the base of this sequence give a range between the 4th and the 2nd century BC.
(5) In the harbour sequence, a facies change at 2.5 m under the Roman sea level involves a change in the processes of sedimentation and/or operation.
(6) No later than the beginning of the 1st century AD, the thickness of the water column in the basin is less than 50 cm and seems to be caused by a massive siltation following a succession of floods of the Tiber.
(7) This basin was thus already abandoned during the start-up of Portus."
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Journal of Archaeological Science, 2014
To the northwest of the ancient city of Ostia, the analysis of cores revealed a stratigraphic seq... more To the northwest of the ancient city of Ostia, the analysis of cores revealed a stratigraphic sequence, which we interpret as the filling of a harbour basin. This basin, located at the west of the so-called
“Palazzo Imperiale” presents seven characteristics: (1) The maximum depth is 6 m below the Roman sea level. This depth allowed any type of ship (even heavy tonnage) to access the harbour. (2) A chronostratigraphic gap at 6 m below Roman sea level suggests digging operations in the basin (or subsequent
dredging) that have caused the loss of sedimentary archives. (3) The filling consists of dark clays typical of a quiet environment but open to marine and river influences. (4) The dates at the base of this sequence give a range between the 4th and the 2nd century BC. (5) In the harbour sequence, a facies change at 2.5 m under the Roman sea level involves a change in the processes of sedimentation and/or operation. (6) No later than the beginning of the 1st century AD, the thickness of the water column in the
basin is less than 50 cm and seems to be caused by a massive siltation following a succession of floods of the Tiber. (7) This basin was thus already abandoned during the start-up of Portus.
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Goiran J.-P., Salomon F., Mazzini I., Bravard J.-P., Pleuger E., Vittori C., Boetto G., Christiansen J., Arnaud P., Pellegrino A., Pepe C., Sadori L., 2014, Geoarchaeology confirms location of the ancient harbour basin of Ostia (Italy), Journal of Archaeological Science 41, 389-398
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Books by Jonatan Christiansen
Akatoi, Roman fleets, Harbours, Kerkouroi, Lighthouses, Marzamemi, Naval warfare, Navicularii, Sh... more Akatoi, Roman fleets, Harbours, Kerkouroi, Lighthouses, Marzamemi, Naval warfare, Navicularii, Ships and shipbuilding in Northern World, Trireme, Utricularii, Water transport, Yassi Ada shipwrecks
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Talks by Jonatan Christiansen
Papers by Jonatan Christiansen
(1) The maximum depth is 6 m below the Roman sea level. This depth allowed any type of ship (even heavy tonnage) to access the harbour.
(2) A chronostratigraphic gap at 6 m below Roman sea level suggests digging operations in the basin (or subsequent
dredging) that have caused the loss of sedimentary archives.
(3) The filling consists of dark clays typical of a quiet environment but open to marine and river influences.
(4) The dates at the base of this sequence give a range between the 4th and the 2nd century BC.
(5) In the harbour sequence, a facies change at 2.5 m under the Roman sea level involves a change in the processes of sedimentation and/or operation.
(6) No later than the beginning of the 1st century AD, the thickness of the water column in the basin is less than 50 cm and seems to be caused by a massive siltation following a succession of floods of the Tiber.
(7) This basin was thus already abandoned during the start-up of Portus."
“Palazzo Imperiale” presents seven characteristics: (1) The maximum depth is 6 m below the Roman sea level. This depth allowed any type of ship (even heavy tonnage) to access the harbour. (2) A chronostratigraphic gap at 6 m below Roman sea level suggests digging operations in the basin (or subsequent
dredging) that have caused the loss of sedimentary archives. (3) The filling consists of dark clays typical of a quiet environment but open to marine and river influences. (4) The dates at the base of this sequence give a range between the 4th and the 2nd century BC. (5) In the harbour sequence, a facies change at 2.5 m under the Roman sea level involves a change in the processes of sedimentation and/or operation. (6) No later than the beginning of the 1st century AD, the thickness of the water column in the
basin is less than 50 cm and seems to be caused by a massive siltation following a succession of floods of the Tiber. (7) This basin was thus already abandoned during the start-up of Portus.
Books by Jonatan Christiansen
(1) The maximum depth is 6 m below the Roman sea level. This depth allowed any type of ship (even heavy tonnage) to access the harbour.
(2) A chronostratigraphic gap at 6 m below Roman sea level suggests digging operations in the basin (or subsequent
dredging) that have caused the loss of sedimentary archives.
(3) The filling consists of dark clays typical of a quiet environment but open to marine and river influences.
(4) The dates at the base of this sequence give a range between the 4th and the 2nd century BC.
(5) In the harbour sequence, a facies change at 2.5 m under the Roman sea level involves a change in the processes of sedimentation and/or operation.
(6) No later than the beginning of the 1st century AD, the thickness of the water column in the basin is less than 50 cm and seems to be caused by a massive siltation following a succession of floods of the Tiber.
(7) This basin was thus already abandoned during the start-up of Portus."
“Palazzo Imperiale” presents seven characteristics: (1) The maximum depth is 6 m below the Roman sea level. This depth allowed any type of ship (even heavy tonnage) to access the harbour. (2) A chronostratigraphic gap at 6 m below Roman sea level suggests digging operations in the basin (or subsequent
dredging) that have caused the loss of sedimentary archives. (3) The filling consists of dark clays typical of a quiet environment but open to marine and river influences. (4) The dates at the base of this sequence give a range between the 4th and the 2nd century BC. (5) In the harbour sequence, a facies change at 2.5 m under the Roman sea level involves a change in the processes of sedimentation and/or operation. (6) No later than the beginning of the 1st century AD, the thickness of the water column in the
basin is less than 50 cm and seems to be caused by a massive siltation following a succession of floods of the Tiber. (7) This basin was thus already abandoned during the start-up of Portus.