Assessment of Physical Properties of a Sea Dike Using Multichannel Analysis of Surface Waves and 3D Forward Modeling

Abstract

Seismic surface waves analysis methods have been widely developed and tested in the context of subsurface characterization and have demonstrated their effectiveness for sounding and monitoring purposes. Given their efficiency, surface waves methods have been used in a variety of contexts, including civil engineering applications. However, at this particular scale, many structures exhibit 3D geometries which drastically limit the efficiency of these methods since they are mostly developed under the assumption of a semi-infinite 1D layered medium without topography. Taking advantages of wave propagation modeling algorithm development and high-performance computing center accessibility, it is now possible to consider the use of a 3D elastic forward modeling algorithm for the inversion of surface wave dispersion. We use a parallelized 3D elastic modeling code based on the spectral element method which allows to obtain accurate synthetic data with very low numerical dispersion and a reasonable numerical cost. In this study, we choose a sea dike as a case example. We first show that their longitudinal geometry and structure may have a significant effect on dispersion diagrams of Rayleigh waves. Then, we investigate the sensitivity of the dispersion diagrams to small velocity and layer thickness perturbations, and show the limitations of the standard 1D surface wave methods approach. Finally, we demonstrate in this context the benefits of using both a 3D forward modeling engine and the whole dispersion diagram, instead of the dispersion curves only.

First application of a new seismo‐electric streamer for combined resistivity and seismic measurements along linearly extended earth structures

“…Indeed, along a meandering embankment or whenever the site geometry is not optimal, it is well known that the shape of the embankment could influence the surface wave dispersive pattern and modes superposition (e.g., Karl et al ., 2011). Also, more complicated internal structural layering or lateral heterogeneities can emphasize geometrical effects and produce dispersion images that are very different from the theoretical 1D case (Pageot et al ., 2016). This was indeed observed in the complicated dispersive pattern of the seismograms acquired within the repaired zone of the studied embankment (see the results in Fig.…”