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Monitoring of the Tidal Response of a Sea Dike Using Sea Waves as Seismic Noise
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 23rd European Meeting of Environmental and Engineering Geophysics, Sep 2017, Volume 2017, p.1 - 5
Abstract
Ambient seismic noise has long been considered as a nuisance for the analysis of seismograms. For some years now, it has shown a great potential for monitoring various geological objects with high accuracy. Here, using ambient seismic noise generated by sea wave impacts, we reconstruct surface waves propagating within a sea dike body, and monitor the tidal response of the structure as the water level changes. Velocity and attenuation variations are obtained respectively from delay and spectral amplitude measurements. We localize lateral areas of variation which temporal evolution is correlated with water level. These variations are interpreted as the consequence of water infiltration inside the structure.
The proposed method may provide a solution for detecting internal erosion, generally only observed at late stage by visual inspection.