Seismic signature of a river flooding in La Réunion Island during the tropical cyclone Dumazile (March 2018) - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Journal of Applied Geophysics Année : 2023

Seismic signature of a river flooding in La Réunion Island during the tropical cyclone Dumazile (March 2018)

Alain Recking
Arnaud Burtin

Résumé

Monitoring of sediment transport during extreme flood events is difficult and often impossible. Fluvial seismology can provide constraints on the mechanisms of this transport and on the seismic sources but few cases of application in context of extreme events such as tropical cyclones were realized. Recordings from three seismic stations temporarily installed along a river (the Rivière du Mât) located in La Réunion Island (Indian Ocean) are analysed to characterize high-frequency (> 1 Hz) seismic noise induced by the extreme flood generated by the tropical cyclone Dumazile (March 2018). We evidence a good correlation (r 2 = 0.94) between the amplitude of the seismic signal and the water level at lower frequencies (2-7 Hz), particularly during the rising limb of the river flood. The relationship between seismic amplitude and water level measurements tested at multiple frequency ranges are consistent with a signal dominated by water flow at lower frequencies and by sediment transport at higher frequencies (15-45 Hz). We show that the use of seismic measurement, particularly at stations located very close to the riverbed can provide comprehensive information on the mechanisms involved during sediment transport associated with extreme flood events when direct measurements are not possible.
Fichier principal
Vignette du fichier
Gonzalez_Seismic_noise_Dumazile_JAG_2023.pdf (12.96 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Licence : CC BY NC - Paternité - Pas d'utilisation commerciale

Dates et versions

insu-04164897 , version 1 (18-07-2023)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

Citer

Alicia Gonzalez, Fabrice R. Fontaine, Guilhem Barruol, Alain Recking, Arnaud Burtin, et al.. Seismic signature of a river flooding in La Réunion Island during the tropical cyclone Dumazile (March 2018). Journal of Applied Geophysics, 2023, 215, pp.105127. ⟨10.1016/j.jappgeo.2023.105127⟩. ⟨insu-04164897⟩
74 Consultations
27 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More