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              <p>Forecasting the evolution and momentum of coastal erosion under current climate changes and forthcoming sea level rise remains a scientific challenge. The Ezponda project aims at studying and hierarchizing the different key parameters (haloclasty, rain, storms), which drives coastal erosion and coastal protection building damage. Haloclasty is a natural rock failure process driven by salt crystallization and salt weathering. When saline fluids are present in the pore space of a material, salt crystal might precipitate upon changes in temperature or humidity conditions, leading to salt precipitation in the pores. The confined crystal growth within the pores might lead to a build-up of crystallization-induced stresses, which can eventually cause fractures in the porous medium [1-2].In this context, this work aims to build an experimentally reliable database that allows for the comparison and validation of further numerical models developed in parallel within the Ezponda project. A simple lab-designed protocol is proposed with well-defined boundary conditions allowing for an easy reproduction with numerical tools. The protocol consists of keeping the base of a cylindrical sample in a 3 molal concentration of sodium sulfate solution at an approximate temperature of 34 ˚C with room temperature controlled at 20 ˚C. Upon capillary uptake and natural evaporation, mirabilite may form within the rock porous network and produce damage as already observed in various civil engineering contexts [3]. Digital Image Correlation (DIC) is applied to characterize the rock deformation and cracking on the sample surface. To localize the damage appearing inside the sample upon crystallization, acoustic sensors were attached to the sample under the same experimental protocol to monitor acoustic emissions within the sample. Finally, the experimental protocol is reproduced at the D50 beam line [4] of the Institut Laue-Langevin for a better insight of the multi-physics couplings between salt crystallization and damage in a porous medium. The acquisition of quasi-simultaneous Neutron and X-ray tomographic (NeXT) scans of the sample under the experimental protocol helps elucidate on the interplay of salt crystallization and damage in porous rock material [5-7].   The study focuses on the erosion of the French Basque Country coastline between Hendaye and Saint-Jean-de-Luz, which is mainly composed of Santonian flysch rock formation - a very low porosity and tight material with few diffused heterogeneities. In addition, different rock materials: Vosges sandstone, Lavoux limestone and a pre-cracked concrete are also studied in order to test the robustness of the on-going numerical model.</p>
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