Géomorphologie et archéologie dans la région lyonnaise : questions et réponses d'un dialogue interdisciplinaire

Bravard, Jean‐Paul; Burnouf, Joëlle; Vérot, A.

doi:10.3406/bspf.1989.9905

Cited by 11 publications

(3 citation statements)

References 1 publication

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“…7) of both sites are in agreement with the patterns found by other studies (e.g. Passega, 1957Passega, , 1964Bravard et al, 1989;Bravard & Peiry, 1999). These results confirm that grain size distribution can be used distinguish depositional environments.…”

Section: Sediment Grain Sizesupporting

confidence: 91%

Fluvial architecture of Belgian river systems in contrasting environments: implications for reconstructing the sedimentation history

Notebaert

Houbrechts

Verstraeten

et al. 2011

Netherlands Journal of Geosciences

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Accurate dating is necessary to get insight in the temporal variations in sediment deposition in floodplains. The interpretation of such dates is however dependent on the fluvial architecture of the floodplain. In this study we discuss the fluvial architecture of three contrasting Belgian catchments (Dijle, Geul and Amblève catchment) and how this influences the dating possibilities of net floodplain sediment storage. Although vertical aggradation occurred in all three floodplains during the last part of the Holocene, they differ in the importance of lateral accretion and vertical aggradation during the entire Holocene. Holocene floodplain aggradation is the dominant process in the Dijle catchment. Lateral reworking of the floodplain sediments by river meandering was limited to a part of the floodplain, resulting in stacked point bar deposits. The fluvial architecture allows identifying vertical aggradation without erosional hiatuses. Results show that trends in vertical floodplain aggradation in the Dijle catchment are mainly related to land use changes. In the other two catchments, lateral reworking was the dominant process, and channel lag and point bar deposits occur over the entire floodplain width. Here, tracers were used to date the sediment dynamics: lead from metal mining in the Geul and iron slag from ironworks in the Amblève catchment. These methods allow the identification of two or three discrete periods, but their spatial extent and variations is identified in a continuous way. The fluvial architecture and the limitation in dating with tracers hampered the identification of dominant environmental changes for sediment dynamics in both catchments. Dating methods which provide only discrete point information, like radiocarbon or OSL dating, are best suited for fluvial systems which contain continuous aggradation profiles. Spatially more continuous dating methods, e.g. through the use of tracers, allow to reconstruct past surfaces and allow to reconstruct reworked parts of the floodplain. As such they allow a better reconstruction of past sedimentation rates in systems with important lateral reworking.

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Section: Sediment Grain Sizesupporting

confidence: 91%

Fluvial architecture of Belgian river systems in contrasting environments: implications for reconstructing the sedimentation history

Notebaert

Houbrechts

Verstraeten

et al. 2011

Netherlands Journal of Geosciences

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“…It is important to recognize that the current concept of risk takes on different meaning depending on the cultures and the periods considered (Kasperson et al, 2005;Arnaud-Fassetta et al, 2009;Bradford et al, 2012). As such, since the 1980's, interdisciplinary studies involving archaeologists, geoarchaeologists and historians have been engaged to examine possible alluvial risks during the Roman period to cities (Bravard, Burnouf, & Vérot, 1989;Bravard et al, 1990;Allinne, 2007;Leveau, 2008;Arnaud-Fassetta et al, 2010) and deltaic areas (Arnaud-Fassetta & Landuré, 2003). During the Roman period, the term "risk" did not exist, but the experience of fluvial events and their disruptions in Rome are well recorded in ancient texts (Le Gall, 1953).…”

Section: Introductionmentioning

confidence: 99%

Long‐Term Interactions between the Roman City of Ostia and Its Paleomeander, Tiber Delta, Italy

et al. 2016

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This study examines the long term interactions between the well-known Roman city of Ostia and a river meander. Located at the mouth of the Tiber River, Ostia was a major harbor city that connected Rome to the Mediterranean Sea. Based on aerial photography and boreholes analysis, the paleodynamics of the Fiume Morto's paleomeander are understood to be linked to the urban evolution of the city of Ostia. Four periods of evolution have been identified as a result of this interdisciplinary work: (1) the foundation of Ostia's urban center, in the 4 th -3 rd century BC, occurred when the meander already existed;(2) between the 4 th century BC and the 3 rd century AD, human/environmental interactions contributed to the compound growing of the meander which possibly eroded an important Roman road linking Ostia to Rome; (3) from the Imperial period until the meander was cut off in AD 1557-1562, the constricted meander channel at the apex led to the stability of the downstream river channel; (4) the cut off of the paleomeander was completed in 1562, leading to the filling of the paleochannel. These successive phases of channel evolution mark changing fluvial risks from the Roman period to today.

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“…Les réponses humaines à cette instabilité, comme les réactions des organismes fluviaux aux interventions anthropiques, sont aléatoires et subissent un décalage temporel fréquent. Cette approche doit conduire les historiens à interpréter les lieux d'occupation d'une manière moins mécaniste que cela a pu être fait dans le passé (Bravard et alii 1989).…”

Section: Quand La Saône Coulait Au Pied De La Colline De Fourvièreunclassified

Première partie. Fragments d’un paysage urbain

Arlaud¹,

Burnouf²,

Bravard³

et al.

Lyon Saint-Jean, Les Fouilles De l'Îlot Tramassac

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La sortie de l'ouvrage consacré à Tramassac intervient un peu plus de dix ans après la signature de la première convention entre le Ministère de la Culture et la SEMALY qui réglementait désormais les fouilles préalables aux travaux du métro. Compte tenu de son caractère alors exemplaire, l'événement connut un certain retentissement. Ne saurait-on mieux en marquer l'anniversaire qu'en éditant ces pages d'histoire lyonnaise que l'archéologie nous restitue fragment après fragment !

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Géomorphologie et archéologie dans la région lyonnaise : questions et réponses d'un dialogue interdisciplinaire

Cited by 11 publications

References 1 publication

Fluvial architecture of Belgian river systems in contrasting environments: implications for reconstructing the sedimentation history

Fluvial architecture of Belgian river systems in contrasting environments: implications for reconstructing the sedimentation history

Long‐Term Interactions between the Roman City of Ostia and Its Paleomeander, Tiber Delta, Italy

Première partie. Fragments d’un paysage urbain

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