Nicolas Carayon

Ancient harbour infrastructure in the Levant: tracking the birth and rise of new forms of anthropogenic pressure.

Beirut, Sidon and Tyre were major centres of maritime trade from the Bronze Age onwards. This economic prosperity generated increased pressures on the local environment, through urbanization and harbour development. Until now, however, the impact of expanding seaport infrastructure has largely been neglected and there is a paucity of data concerning the environmental stresses caused by these new forms of anthropogenic impacts. Sediment archives from Beirut, Sidon and Tyre are key to understanding human impacts in harbour areas because: (i) they lie at the heart of ancient trade networks; (ii) they encompass the emergence of early maritime infrastructure; and (iii) they enable human alterations of coastal areas to be characterized over long timescales. Here we report multivariate analyses of litho- and biostratigraphic data to probe human stressors in the context of their evolving seaport technologies. The statistical outcomes show a notable break between natural and artificial sedimentation that began during the Iron Age. Three anchorage phases can be distinguished: (i) Bronze Age proto-harbours that correspond to natural anchorages, with minor human impacts; (ii) semi-artificial Iron Age harbours, with stratigraphic evidence for artificial reinforcement of the natural endowments; and (iii) heavy human impacts leading to completely artificial Roman and Byzantine harbours.

The development and characteristics of ancient harbours. Applying the PADM chart to the case studies of Ostia and Portus

Over the last 20 years, the geoarchaeology of ancient harbours has been a very active area of research around the Mediterranean basin, generating much palaeoenvironmental data from many sites, including estimations of sedimentation rates, the height of the ancient sea-level at different dates and palaeo-geographical reconstructions. Combining this information has proved a major challenge. This article proposes a new chart called the Palaeoenvironmental Age-Depth Model (PADM chart), that allows the researchers to combine all relevant indicators in order to estimate harbour potential of a given ancient port, and to generate comparable data between harbours in terms of degree of closure and water depth available against a synchronised chronology. This new approach, developed in the context of the ERC-funded RoMP Portuslimen project, takes into account estimations of water depths relating to differing Roman ship draughts at different periods. It is tested against the palaeoenvironmental evidence published over 10 years from two Roman harbours located at the mouth of the river Tiber: Ostia and Portus. This reveals that: (1) there has been an underestimate of the real sedimentation rates due to the margins of error of the radiocarbon dates; (2) there was effective control of the water column by dredging; (3) there were different periods of control of the sedimentation. We suggest that the navigability of the Ostia harbour by ships with shallower draughts was maintained until sometime between the 2nd c. BC and 1st c. AD, while at Portus it was retained until the 6th—7th c. AD.

Un « modèle âge-profondeur paléoenvironnemental » pour interpréter les séquences sédimentaires en milieu portuaire (Portus, Italie)

The geoarchaeology of ancient harbours is based on palaeoenvironmental and palaeogeomorphological analysis and considers data issued from archaeological and historical sources. Many different kinds of evidence need to be taken into account concerning the organisation of the harbour, its chronology, and its dynamics. The “Palaeoenvironmental Age-Depth Model” (PADM) was developed in the context of a European Union (ERC Adanced Grant) funded project studying Roman ports across the Mediterranean Sea. It allows researchers to integrate all the data relevant to reconstructions of the development of harbour potential through time. The PADM is based on the analysis of one or several stratigraphic sequences with dates integrated within a classic “age-depth” model. To these is added evidence for the evolution of the water level, together with archaeological and historical data for calibrating the age-depth model (the draught of ships of specific periods, chronological data, level of quays etc.). In this paper, this diagram is tested against the case of Portus. It shows the evolution of the depositional context, and reconstructs the evolution of the water column of the harbour through time.

Un « modèle âge-profondeur paléoenvironnemental » pour interpréter les séquences sédimentaires en milieu portuaire (Portus, Italie)@@@A “palaeoenvironmental age-depth model” to interpret sedimentary sequences in harbour context (Portus, Italy)

The geoarchaeology of ancient harbours is based on palaeoenvironmental and palaeogeomorphological analysis and considers data issued from archaeological and historical sources. Many different kinds of evidence need to be taken into account concerning the organisation of the harbour, its chronology, and its dynamics. The “Palaeoenvironmental Age-Depth Model” (PADM) was developed in the context of a European Union (ERC Adanced Grant) funded project studying Roman ports across the Mediterranean Sea. It allows researchers to integrate all the data relevant to reconstructions of the development of harbour potential through time. The PADM is based on the analysis of one or several stratigraphic sequences with dates integrated within a classic “age-depth” model. To these is added evidence for the evolution of the water level, together with archaeological and historical data for calibrating the age-depth model (the draught of ships of specific periods, chronological data, level of quays etc.). In this paper, this diagram is tested against the case of Portus. It shows the evolution of the depositional context, and reconstructs the evolution of the water column of the harbour through time.

A “palaeoenvironmental age-depth model” to interpret sedimentary sequences in harbour context (Portus, Italy)

The geoarchaeology of ancient harbours is based on palaeoenvironmental and palaeogeomorphological analysis and considers data issued from archaeological and historical sources. Many different kinds of evidence need to be taken into account concerning the organisation of the harbour, its chronology, and its dynamics. The “Palaeoenvironmental Age-Depth Model” (PADM) was developed in the context of a European Union (ERC Adanced Grant) funded project studying Roman ports across the Mediterranean Sea. It allows researchers to integrate all the data relevant to reconstructions of the development of harbour potential through time. The PADM is based on the analysis of one or several stratigraphic sequences with dates integrated within a classic “age-depth” model. To these is added evidence for the evolution of the water level, together with archaeological and historical data for calibrating the age-depth model (the draught of ships of specific periods, chronological data, level of quays etc.). In this paper, this diagram is tested against the case of Portus. It shows the evolution of the depositional context, and reconstructs the evolution of the water column of the harbour through time.