Dynamiques d’arrachement, de transport et de dépôt de blocs cyclopéens par les tempêtes : le cas de la tempête du 10 mars 2008 sur l’île de Banneg (archipel de Molène, Finistère)

Fichaut, Bernard; Suanez, Serge

doi:10.4000/norois.3224

Cited by 10 publications

(3 citation statements)

References 23 publications

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“…The particularly violent storm that occurred on 10 March 2008 caused the coastline to retreat by 2–3m in places (Cariolet et al . 2010; Fichaut & Suanez 2010; Suanez et al 2011). In the aftermath of this climatic event, many archaeological sites (Bronze Age stone cist, Middle Neolithic I long barrow, Neolithic shell midden) were uncovered (Gandois et al 2013) (Fig.…”

Section: Geography Of the Molène Archipelagomentioning

confidence: 99%

Landscape Evolution and Human Settlement in the Iroise Sea (Brittany, France) during the Neolithic and Bronze Age

Pailler

Stéphan²,

Gandois

et al. 2014

Proc. Prehist. Soc.

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International audienceThe Molène archipelago appears to be particularly rich in Neolithic and Bronze Age remains and an exceptional concentration of megaliths has been brought to light. Several settlements are confirmed by dry-stone structures or by shell middens. These data give precious indications on the occupation chronology of the area. Moreover they allow us, for the first time in Brittany, to reconstruct everyday life during the late Prehistoric period.A prerequisite to this reconstruction was a better understanding of the evolution of the environment during this period, which locally implies a better knowledge of paleogeographic changes related to Holocene sea-level rise as well as on floral and faunal resources. The results obtained through paleogeographic reconstructions show that the archipelago since 4500 BC was already disconnected from the mainland. The megalithic monuments must therefore have been erected and used by islanders present on the archipelago from the middle of the 5th to the 2nd millennium BC. The distribution of the megalithic tombs reveals landscape occupation strategies which respond to both cultural choices and natural constraints. Throughout the entire period, geographic isolation has continued to increase, although it did not imply strong cultural specificities. Nevertheless, the increasing remoteness of the islands has fostered the search for livelihoods based on the intense exploitation of coastal resources. Despite their focus on the sea, these people did not neglect what inland areas could offer as evidenced by the early agro-pastoral practices in the archipelago

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Section: Geography Of the Molène Archipelagomentioning

confidence: 99%

Landscape Evolution and Human Settlement in the Iroise Sea (Brittany, France) during the Neolithic and Bronze Age

Pailler

Stéphan²,

Gandois

et al. 2014

Proc. Prehist. Soc.

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“…Fortunately, an event of clast deposition on the cliff top was recorded during a storm event on 9-13 March 2008, when waves larger than 3 m Hs in deepwater were maintained during 90 h. The morphological effects of this storm have been reported in several sectors of the European Atlantic coast, especially in the north French coast (for example, Fichaut and Suanez, 2010). According to our data, the average significant wave height and period for the storm were 5.9 m and 8.5 s, respectively, and the maximum wave height was 19.7 m, with a maximum peak period of 16.7 s. The maximum tidal elevation during the storm was 5.09 m. Waves higher than 8 m with periods longer than 11 s (offshore) arrived for 14 h between 10 and 11 March.…”

Section: Storm Wave Analysismentioning

confidence: 99%

Late-Holocene storm imprint in a coastal sedimentary sequence (Northwest Iberian coast)

et al. 2014

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A combination of sedimentological, geomorphological, and pedological methods has been used to study a late-Holocene sedimentary sequence in a rock coast sector from NW Spain, with the aim of relating it to storm events and their morphodynamic effects. The sequence contains two coarse beach layers at an elevation of 2.8–3.5 m above the present highest astronomical tide (HAT). Radiocarbon dating revealed that their deposition had begun during 1735–1590 cal. yr BP and has continued until the present. The entire beach system experienced considerable morphological change after 1320–1230 cal. yr BP, with a westward displacement of the beach and a retreat of the sedimentary cliff in the eastern section. The two beach layers seem to have been formed by vertical aggradation of clasts and sand during high-energy storm events, highlighting the role of these events in the formation of sedimentary sequences on the rocky coasts of mid-Atlantic Europe. The effects of a recent storm event, recorded in March 2008, and the results of wave calculations suggest that long swell waves were needed for the accretion of the clasts. Using a hindcast model of wave data, we found a positive correlation between the winter North Atlantic Oscillation (WNAO) index and the winter monthly mean wave height and peak period. While the 14C chronology of beach sedimentation coincides with known climatic periods dominated by a positive NAO index, these results point to the importance of high-energy events and the synergies between past and present processes in the recent evolution and the morphodynamics of rock coast environments.

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“…Some storm deposits comprise blocks that are similar to those laid down by tsunamis (Hall et al 2006;Hansom et al 2008). This is simply because some extreme storms have waves which can be more than 18 m high (Cariolet et al 2010), may displace blocks up to 42 tons (Fichaut and Suanez 2010) and build cliff top deposits with mega clasts (cliff-top storm deposit(s) ¼ CTSDs; Hansom et al 2008).…”

Section: Discussionmentioning

confidence: 99%

The Coastal Sediment Provenance and Their Distribution in the Mediterranean Beaches of NW Morocco

Mrini

Nachite²,

Anfuso

et al. 2014

Coastal Research Library

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The aim of this book series is to disseminate information to the coastal research community. The Series covers all aspects of coastal research including but not limited to relevant aspects of geological sciences, biology (incl. ecology and coastal marine ecosystems), geomorphology (physical geography), climate, littoral oceanography, coastal hydraulics, environmental (resource) management, engineering, and remote sensing. Policy, coastal law, and relevant issues such as conflict resolution and risk management would also be covered by the Series. The scope of the Series is broad and with a unique crossdisciplinary nature. The Series would tend to focus on topics that are of current interest and which carry some import as opposed to traditional titles that are esoteric and non-controversial. Monographs as well as contributed

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Dynamiques d’arrachement, de transport et de dépôt de blocs cyclopéens par les tempêtes : le cas de la tempête du 10 mars 2008 sur l’île de Banneg (archipel de Molène, Finistère)

Cited by 10 publications

References 23 publications

Landscape Evolution and Human Settlement in the Iroise Sea (Brittany, France) during the Neolithic and Bronze Age

Landscape Evolution and Human Settlement in the Iroise Sea (Brittany, France) during the Neolithic and Bronze Age

Late-Holocene storm imprint in a coastal sedimentary sequence (Northwest Iberian coast)

The Coastal Sediment Provenance and Their Distribution in the Mediterranean Beaches of NW Morocco

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