Assessment of Flooding Hazards at An Engineered Beach during Extreme Events: Biarritz, SW France

Morichon, Denis; Santiago, Iñaki de; Delpey, Matthias; Somdecoste, Tom; Callens, Aurélien; Liquet, Benoît; Liria, Pedro; Arnould, Philippe

doi:10.2112/si85-161.1

Cited by 9 publications

(5 citation statements)

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“…To investigate the potential effect of the different corrections in a real case scenario, the extreme wave run-up R 2% at the Grande Plage de Biarritz has been computed for the test period with the Stockdon formula (Stockdon et al, 2006) which uses H s and T p and the beach slope as parameters. The beach slope is fixed to 8% according to the work of Morichon et al (2018). Using the extreme wave run-up calculated with the buoy data as reference, the metrics presented previously have been computed for the numerical Contrary to neural networks, Random forest and Gradient boosting trees provided valuable insights by giving the predictive power of each input variable.…”

Section: Example Of Applicationmentioning

confidence: 99%

Using Random forest and Gradient boosting trees to improve wave forecast at a specific location

Callens

Morichon

Abadie

et al. 2020

Applied Ocean Research

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103

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Section: Example Of Applicationmentioning

confidence: 99%

Using Random forest and Gradient boosting trees to improve wave forecast at a specific location

Callens

Morichon

Abadie

et al. 2020

Applied Ocean Research

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103

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“…La Grande Plage de Biarritz (GPB, figure 1), située sur le littoral basque, est une plage de poche, fortement urbanisée, de type intermédiaire-réflective avec un estran pentu (8-9%) et une terrasse de faible pente (2-3%) (MORICHON et al, 2018). L'exposition de la GPB aux vagues de tempêtes est élevée comme en témoigne la base de données historique établie par ABADIE et al, (2018).…”

Section: Site D'étudeunclassified

Etude de l'impact d'une tempête extrême sur la Grande Plage de Biarritz en présence d'une digue amovible en sacs de sable

ROZKI¹,

MORICHON²,

DELPEY³

et al. 2022

XVIIèmes Journées, Chatou

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Biarritz a connu plusieurs événements de tempêtes extrêmes ces dernières décennies qui ont causé d'importants dégâts matériels sur les ouvrages et bâtiments situés en front de mer. Ces événements ont conduit à̀ la mise en place d'une stratégie de protection des infrastructures et des usagers qui intègre notamment le déploiement d'une digue amovible en sacs de sable sur le perré situé en haut de plage. Cette étude présente les résultats d'une campagne de mesure réalisée pendant la tempête Justine du 31 janvier 2021 qui a fortement frappé le littoral basque et des simulations associées. Le dispositif de mesure mis en place comprend une série de capteurs de pression fixés au pied du perré́ sur lequel avaient été sanglées deux rangées de sacs de sable. Ces capteurs sont utilisés pour déterminer les occurrences de franchissement et les hauteurs associées atteintes pendant la tempête en plusieurs endroits le long de la plage. L'hydrodynamique sur l'estran, est étudiée à partir d'un modèle de vague à phase résolue qui est utilisé pour estimer les efforts mécaniques exercés sur les sacs de sable lors des franchissements. Les résultats du modèle permettent d'apporter des premiers éléments de compréhension des processus hydrodynamiques pouvant être à l'origine de mouvements très localisés de sacs de sable observés pendant cette tempête.

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“…Due to the bathymetry in this area, in which deep water is relatively close to the shore, storm winds do not generally account significantly to surges, which are completely driven by atmospheric pressure variations. The Grande Plage beach is an intermediate-reflective beach with a mean sediment grain diameter equal to 0.3 mm and typically exhibiting a steep foreshore slope of 8 − 9% and a gentle nearshore slope of 2 − 3% [17]. Finally, the water front is composed of a waterfront boardwalk (Figure 2 right) located at 7.65m CD.…”

Section: Site Descriptionmentioning

confidence: 99%

Coastal flooding event definition based on damages: Case study of Biarritz Grande Plage on the French Basque coast

Arnoux

Abadie

Bertin

et al. 2021

Coastal Engineering

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This paper presents a method to include damage at the initial stage of coastal flooding events definition and in return periods computation. The methodology is illustrated within a local study carried out in Biarritz Grande Plage, a meso-tidal, wave dominated beach located on the french basque coast in the south west of France. The work is based on two datasets covering the period 1949-2015 : a first one, consisting of observation and synthetic data on wave characteristics and water level, and a second one, gathering storm dates and related damage intensities obtained through investigations in the press and in archives. A statistical analysis was first carried out to find the best combination of source variables explaining the reported damages for the identified storms. Maximal, mean and accumulated values were calculated over storm duration, considering source and aggregated variables based on the empirical run-up formula or the wave energy flux. Most rules combining a wave parameter and water level are found to provide satisfactory damage prediction as soon as maxima variables are considered. Rules based on mean variables are less accurate and those based on accumulated variable values are not relevant. The best results are obtained with the wave energy flux and water level maxima over the storm duration. The ability of the rules to be used as generic event definition rules is then tested by performing a retrospective analysis on the whole dataset, checking their efficiency in detecting historical storms (i.e., with damages) without finding too many false positives. Most of the rules formerly studied, except the ones using wave period only as wave parameter, were able to correctly perform this task. Coastal flood event return periods (RP) were then calculated by applying three of the best rules identified previously. The rule using non simultaneous maxima of wave energy flux and water level gives encouraging results for the RP values. Nevertheless, the discrepancy still observed among the different rules calls for further work in this direction.

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Assessment of Flooding Hazards at An Engineered Beach during Extreme Events: Biarritz, SW France

Cited by 9 publications

References 0 publications

Using Random forest and Gradient boosting trees to improve wave forecast at a specific location

Using Random forest and Gradient boosting trees to improve wave forecast at a specific location

Etude de l'impact d'une tempête extrême sur la Grande Plage de Biarritz en présence d'une digue amovible en sacs de sable

Coastal flooding event definition based on damages: Case study of Biarritz Grande Plage on the French Basque coast

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