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Vous êtes ici : Accueil / Actualités / Séminaires / Seminaires Septembre 2017-Aout 2018 / Jeudi 25 janvier - Continues observation of nearshore depth profiles and storm-morphology

Jeudi 25 janvier - Continues observation of nearshore depth profiles and storm-morphology

Par SEMSOU Dernière modification 08/01/2018 13:49
Quand ? Le 25/01/2018,
de 11:00 à 12:00
Où ? salle Lyot
Participants Erwin Bergsma, LEGOS
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Erwin Bergsma

LEGOS

 

Titre : Continues observation of nearshore depth profiles and storm-morphology


Résumé : This talk focuses on the use of a video-based remote sensing technique to obtain nearshore depth profiles and ultimately capturing storm morphology. Video-data has been collected over a period of 1.5 years and covers one of the most energetic European winters ever measured (2013-2014). The video-data is used to invert depths in the nearshore every hour. A spectral technique to determine wave number and frequency is used to estimate celerity and invert to depth using the linear dispersion relation for free surface waves. With conventional methods, depth measuring instruments won’t last under extremely powerful wave conditions during storms. The application of this video-based remote sensing technique during storms give a first quantitative measure for storm morphology. In addition, the 1.5 year hourly bathymetries result in a unique dataset of nearshore morphology under calm and extreme storm conditions, the data shows great morphological impact (erosion) of the extreme winter and subsequent recovery.

 

This presentation will be given in english.

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