Towards the Development of a Storm Erosion EWS for the French Aquitaine Coast

Towards the Development of a Storm Erosion EWS for the French Aquitaine Coast. Lerma, A. N., Bulteau, T., Muller, H., Decarsin, C., Gillet, R., Paris, F., Biausque, M., Senechal, N., & Castelle, B. 85:666–670. Number: sp1

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Nicolae Lerma A.; Bulteau, T.; Muller, H.; Decarsin, C.; Gillet, R.; Paris, F.; Biausque, M.; Senechal, N., and Castelle, B., 2018. Towards the development of a storm erosion EWS for the French Aquitanian coast. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 666–670. Coconut Creek (Florida), ISSN 0749-0208.The 230-km long Aquitaine sandy coast, SW France, is vulnerable to erosion hazards owing to its full exposure to Atlantic storm waves. Since 2015, the Observatory of the Aquitaine Coast and several academic and local partners have developed a network to better survey and forecast storm-driven morphological changes at regional scale. This paper presents the implementation of an early warning system (EWS) with the primary objective to alert the network members 2–3 days ahead in order to perform pre-storm and post-storm surveys. Regional bulletins are edited to identify the most exposed coastal sections. At local scale, tests are realized on two morphological indicators used to forecast qualitatively and quantitatively the likelihood of beach and dune erosion. The two indicators (namely the Collision Regime Indicator, CRI, and the Eroded Volume Indicator, EVI, were calibrated and further validated at two nearby beaches where extensive morphological data are collected regularly: bimonthly surveys from 2009 to 2015 at Truc Vert beach and surveys every 2 to 7 days during the winters since 2015 at Biscarrosse beach. Results indicate promising performance, with the CRI predicting collision regime when front dune erosion was indeed observed, and the EVI predicting fairly accurate eroded sediment volume on cross shore beach profile. Nevertheless, more extensive validation of the CRI and EVI is needed to extend the indicators to the entire Aquitaine coast and for a wide range single storms and storm clusters.

@article{lerma_towards_2018,
	title = {Towards the Development of a Storm Erosion {EWS} for the French Aquitaine Coast},
	volume = {85},
	issn = {0749-0208, 1551-5036},
	url = {https://bioone.org/journals/Journal-of-Coastal-Research/volume-85/issue-sp1/SI85-134.1/Towards-the-Development-of-a-Storm-Erosion-EWS-for-the/10.2112/SI85-134.1.full},
	doi = {10.2112/SI85-134.1},
	abstract = {Nicolae Lerma A.; Bulteau, T.; Muller, H.; Decarsin, C.; Gillet, R.; Paris, F.; Biausque, M.; Senechal, N., and Castelle, B., 2018. Towards the development of a storm erosion {EWS} for the French Aquitanian coast. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium ({ICS}) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 666–670. Coconut Creek (Florida), {ISSN} 0749-0208.The 230-km long Aquitaine sandy coast, {SW} France, is vulnerable to erosion hazards owing to its full exposure to Atlantic storm waves. Since 2015, the Observatory of the Aquitaine Coast and several academic and local partners have developed a network to better survey and forecast storm-driven morphological changes at regional scale. This paper presents the implementation of an early warning system ({EWS}) with the primary objective to alert the network members 2–3 days ahead in order to perform pre-storm and post-storm surveys. Regional bulletins are edited to identify the most exposed coastal sections. At local scale, tests are realized on two morphological indicators used to forecast qualitatively and quantitatively the likelihood of beach and dune erosion. The two indicators (namely the Collision Regime Indicator, {CRI}, and the Eroded Volume Indicator, {EVI}, were calibrated and further validated at two nearby beaches where extensive morphological data are collected regularly: bimonthly surveys from 2009 to 2015 at Truc Vert beach and surveys every 2 to 7 days during the winters since 2015 at Biscarrosse beach. Results indicate promising performance, with the {CRI} predicting collision regime when front dune erosion was indeed observed, and the {EVI} predicting fairly accurate eroded sediment volume on cross shore beach profile. Nevertheless, more extensive validation of the {CRI} and {EVI} is needed to extend the indicators to the entire Aquitaine coast and for a wide range single storms and storm clusters.},
	pages = {666--670},
	issue = {sp1},
	journaltitle = {Journal of Coastal Research},
	shortjournal = {coas},
	author = {Lerma, Alexandre Nicolae and Bulteau, Thomas and Muller, Héloise and Decarsin, Clément and Gillet, Raphael and Paris, François and Biausque, Mélanie and Senechal, Nadia and Castelle, Bruno},
	urldate = {2019-11-26},
	date = {2018-05},
	note = {Number: sp1}
}

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(eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 666–670. Coconut Creek (Florida), ISSN 0749-0208.The 230-km long Aquitaine sandy coast, SW France, is vulnerable to erosion hazards owing to its full exposure to Atlantic storm waves. Since 2015, the Observatory of the Aquitaine Coast and several academic and local partners have developed a network to better survey and forecast storm-driven morphological changes at regional scale. This paper presents the implementation of an early warning system (EWS) with the primary objective to alert the network members 2–3 days ahead in order to perform pre-storm and post-storm surveys. Regional bulletins are edited to identify the most exposed coastal sections. At local scale, tests are realized on two morphological indicators used to forecast qualitatively and quantitatively the likelihood of beach and dune erosion. 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