Impacts des vagues et de la circulation d’eau sur la microfracturation des falaises rocheuses. Mise en place d’un suivi multiparamètre en Bretagne

Abstract

In order to gain new insights into the agents and processes controlling hard rock coast erosion and retreat, a high frequency and multi-parameter monitoring field experiment was carried out from February until May 2017 in Porsmilin cliffs (Plougonvelin, Finistère, Brittany). This survey aimed to discriminate the relative contributions of subaerial (groundwater infiltration, watertable variations…) and marine (infragravity wave loading, wave impact...) agents and processes in the evolution of rock microfracturing. A better knowledge of their contributions will allow to improve the forecasting/ prevention of cliff failure.

RTK GNSS-Assisted Terrestrial SfM Photogrammetry without GCP: Application to Coastal Morphodynamics Monitoring

“…Hydrodynamic processes and the morphodynamic response of the beach were evaluated during large-scale field campaigns in 2014 and 2016 [28,29]. Besides, the evolution of the western cliff was monitored using a multi-instrument and multi-parameter campaign during the winter of 2016/2017 [30]. The present methodological study also focuses on the western cliff face.…”

Experimental field study on the fatigue and failure mechanisms of coastal chalk cliffs: Implementation of a multi-parameter monitoring system (Sainte-Marguerite-sur-Mer, France)

“…One of the other perspectives is to compare this dataset with others, including the one previously mentioned and that was acquired in Brittany, with equivalent instruments (Letortu et al, 2017;Laute et al, 2018).…”

“…In order to overcome the first two above-mentioned scientific barriers, an ambitious, multiparameter and continuous monitoring survey (13 months, from November 2018 to January 2020) was implemented at a chalk cliff site in Sainte-Marguerite-sur-Mer (Normandy, France), based on prior field monitoring experiments carried out in Brittany (Letortu et al, 2017;Laute et al, 2018). This work in Normandy is part of the RICOCHET project (2017-2021, http://anr-ricochet.unicaen.fr/), funded by the French National Research Agency (ANR).…”