Atmospheric and marine aspects of the 10th of March 2008 storm in Atlantic and in the Channel

Cariolet, Jean-Marie; Costa, Stéphane; Caspar, Rémi; Ardhuin, Fabrice; Magne, Rudy; Goasguen, Gérard

doi:10.4000/norois.3242

Cited by 32 publications

(20 citation statements)

References 17 publications

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“…(A) Study site location denoting the sampling area, the wave model output location and wave model calibration point. The curved arrow in the inset map denotes the approximate storm pathway (after Cariolet et al , ). (B) Map showing the three morphogenic zones across the bed layer 24 portion of the study area, along with a cross‐shore profile illustrating the change in vertical elevation across the sampling area.…”

Section: Study Site and Extra‐tropical Cyclone Johannamentioning

confidence: 99%

Geomorphological control on boulder transport and coastal erosion before, during and after an extreme extra‐tropical cyclone

Naylor

Stephenson

Smith

et al. 2016

Earth Surf Processes Landf

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Extreme wave events in coastal zones are principal drivers of geomorphic change. Evidence of boulder entrainment and erosional impact during storms is increasing. However, there is currently poor time coupling between pre-and post-storm measurements of coastal boulder deposits. Importantly there are no data reporting shore platform erosion, boulder entrainment and/or boulder transport during storm events -rock coast dynamics during storm events are currently unexplored. Here, we use high-resolution (daily) field data to measure and characterize coastal boulder transport before, during and after the extreme Northeast Atlantic extra-tropical cyclone Johanna in March 2008. Forty-eight limestone fine-medium boulders (n = 46) and coarse cobbles (n = 2) were tracked daily over a 0.1 km 2 intertidal area during this multi-day storm. Boulders were repeatedly entrained, transported and deposited, and in some cases broken down (n = 1) or quarried (n = 3), during the most intense days of the storm. Eighty-one percent (n = 39) of boulders were located at both the start and end of the storm. Of these, 92% were entrained where entrainment patterns were closely aligned to wave parameters. These data firmly demonstrate rock coasts are dynamic and vulnerable under storm conditions. No statistically significant relationship was found between boulder size (mass) and net transport distance. Graphical analyses suggest that boulder size limits the maximum longshore transport distance but that for the majority of boulders lying under this threshold, other factors influence transport distance. Paired analysis of 20 similar sized and shaped boulders in different morphogenic zones demonstrates that geomorphological control affects entrainment and transport distance -where net transport distances were up to 39 times less where geomorphological control was greatest. These results have important implications for understanding and for accurately measuring and modelling boulder entrainment and transport. Coastal managers require these data for assessing erosion risk.

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Section: Study Site and Extra‐tropical Cyclone Johannamentioning

confidence: 99%

Geomorphological control on boulder transport and coastal erosion before, during and after an extreme extra‐tropical cyclone

Naylor

Stephenson

Smith

et al. 2016

Earth Surf Processes Landf

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“…The "best before" date of the bottle is April 15th 2002. Eyewitness accounts suggest that the event in question was a large storm in 2008, which was associated with a surge of 0.78 m during the peak high tide at nearby Concarneau (Cariolet et al 2010). Based on sediments in the cross-section, sand accumulated to a depth of at least 0.8 m, although this is likely an underestimate since some material may have been deflated subsequently.…”

Section: Recent History Of the Trunvel Marshmentioning

confidence: 99%

Evolution of a Coastal Beach/Barrier/Marsh System in Response to Sea Level Rise, Storm Events and Human Impacts: A Case Study of Trunvel Marsh, Western Brittany

Regnauld

Ruault

Proust

et al. 2016

Advances in Geographical and Environmental Sciences

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International audienceThe evolution of coastal sites such as beach/barrier/marsh systems is known to be strongly forced by sea level rise and controlled by storms, sediment input and human impacts. The relative weight of each may vary in time. However, it is difficult to determine the relative importance of these forcing controls and, therefore, how coastal systems evolve through time. In order to study this evolution we have selected the case study of Trunvel marsh, western Brittany, France, which is directly exposed to the most violent storms and has been extensively depleted of sediment during and since WW2. The relative balance of anthropogenic and meteorological controls and relative sea level rise is compared. Sediment cores have been obtained from within the marsh, cross sections of the barrier have been studied and air photos and old maps have been analysed. From 4000 BP to recent times the system has behaved in a simple way: the beach and the barrier accumulated sand and gravel, seeming to migrate inland with relative sea level rise and the marsh was alternatively eroded by the local river or fed by aeolian drifted sands. Very occasional storms may have breached the barrier and temporarily invaded (flooded) the marsh. Conversely, large events of river discharge may have breached the barrier, although there appears to be some natural resilience and the barrier rebuilds itself after each storm and the marsh is, once again isolated from the sea. At the beginning of the Roman period land use change appears to have modified the river discharge, following which the marsh seems to have been in its natural condition again until WW2, although some dykes were built and channels excavated. During WW2 the gravel was almost totally removed and used for concrete to build fortifications along the coast. After WW2, the system was totally controlled by management practices, the aim of which was to recreate a “natural” environment so that today this is a “human made natural landscape” and is now classified as a nature reserve. The barrier is no longer able to withstand storms and the river discharge does not always reach the sea. Therefore human management of water level in the marsh is today the main morpho-dynamic control for the whole system

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“…The Johanna storm struck the French Brittany region and southern Great Britain on 10 March 2008 over a 48 h period, with winds between 130 and 150 km h −1 along the coast, an atmospheric depression of 975 hPa over Brittany and particularly high waves measuring up to 13 m offshore, which caused a coastal storm surge phenomena (Cariolet et al, 2010). Moreover, the storm occurred in conjunction with high spring tides (of a coefficient of 106 at Brest, compared to a maximum of 120 for the highest theoretically possible tide).…”

Section: Study Area and Storms Presentationmentioning

confidence: 99%

Contribution of insurance data to cost assessment of coastal flood damage to residential buildings: insights gained from Johanna (2008) and Xynthia (2010) storm events

André

Monfort

Bouzit

et al. 2013

Nat. Hazards Earth Syst. Sci.

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There are a number of methodological issues involved in assessing damage caused by natural hazards. The first is the lack of data, due to the rarity of events and the widely different circumstances in which they occur. Thus, historical data, albeit scarce, should not be neglected when seeking to build ex-ante risk management models. This article analyses the input of insurance data for two recent severe coastal storm events, to examine what causal relationships may exist between hazard characteristics and the level of damage incurred by residential buildings. To do so, data was collected at two levels: from lists of about 4000 damage records, 358 loss adjustment reports were consulted, constituting a detailed damage database. The results show that for flooded residential buildings, over 75% of reconstruction costs are associated with interior elements, with damage to structural components remaining very localised and negligible. Further analysis revealed a high scatter between costs and water depth, suggesting that uncertainty remains high in drawing up damage functions with insurance data alone. Due to the paper format of the loss adjustment reports, and the lack of harmonisation between their contents, the collection stage called for a considerable amount of work. For future events, establishing a standardised process for archiving damage information could significantly contribute to the production of such empirical damage functions. Nevertheless, complementary sources of data on hazards and asset vulnerability parameters will definitely still be necessary for damage modelling; multivariate approaches, crossing insurance data with external material, should also be investigated more deeply

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Atmospheric and marine aspects of the 10th of March 2008 storm in Atlantic and in the Channel

Cited by 32 publications

References 17 publications

Geomorphological control on boulder transport and coastal erosion before, during and after an extreme extra‐tropical cyclone

Geomorphological control on boulder transport and coastal erosion before, during and after an extreme extra‐tropical cyclone

Evolution of a Coastal Beach/Barrier/Marsh System in Response to Sea Level Rise, Storm Events and Human Impacts: A Case Study of Trunvel Marsh, Western Brittany

Contribution of insurance data to cost assessment of coastal flood damage to residential buildings: insights gained from Johanna (2008) and Xynthia (2010) storm events

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