Geotechnical works, dams and geostructures Ineris carries out studies on a wide range of geostructures such as sealing structures, hydraulic works (dams, dikes), rock civil engineering structures, old tunnels, mining waste (slag heaps) and dumps. The Institute provides diagnostics and recommendations on the safety performance and stability of these structures, as well as their potential impact on the environment. Ineris approaches are based on experiences of past accidents, visual inspections, physical or digital 2D and 3D models and simulations, on-site investigation methods such as 3D laser scanning, deformations or stresses measurements, geodesy at a local level, seismic imaging and acoustic monitoring. Over the last years the effects of climate change on the safety of some types of structures and other vulnerable targets has become a growing field of study within the Institute. In the Val d’Orléans in Loiret, Ineris studies the occurrence of karst sinkholes and how they interact with the dikes that protect against flooding of the Loire river. At Estreux and Château-Landon sites in northern France and Seine-et-Marne respectively, the Institute studies the impact of rising groundwater and seasonal flooding in abandoned underground chalk quarries and their vulnerability to sudden collapse in case of even partial flooding. Indeed, acquisition, enrichment and consolidation of knowledge on these complex phenomena make risk prevention progress, which finally improves the crisis management capabilities.