The network Numérique en Terre Solide (NuTS) is a CNRS–INSU-funded thematic network dedicated to numerical methods in the solid Earth sciences. It brings together researchers, engineers, and students working on modeling, inverse problems, data analysis, and scientific computing, with a strong emphasis on open tools, reproducible workflows, and community-driven developments. This event is the fourth workshop organized by the NuTS network, continuing its effort to structure and connect the national community around numerical geosciences.

A central objective of this workshop is to strengthen exchanges with neighboring scientific communities that have developed strong expertise in data assimilation, particularly in hydrology, atmospheric sciences, and related Earth system disciplines. These communities have long experience in combining large observational datasets with physical models and operational frameworks, offering valuable perspectives for solid Earth applications. In this context, the session will position data assimilation as a bridge between observations, physical modeling, and data-driven approaches.

Rather than providing a detailed methodological course, the goal is to share perspectives across communities, discuss common challenges such as uncertainty quantification, multi-scale dynamics, and large observational data streams, and explore emerging hybrid approaches combining physical modeling and machine learning.

Through invited presentations, discussions, and practical sessions, this workshop aims to foster cross-disciplinary dialogue and help position data assimilation within open, reproducible, and collaborative scientific workflows, in line with the broader objectives of the NuTS network.

The event will take place at the Manufacture des Tabacs in Strasbourg, where we will have access to an amphitheater for presentations and practical sessions, as well as four rooms dedicated to thematic group discussions. The workshop will start on May 26, 2026, at 1:00 pm and will end on May 29 at noon.

Travel and accommodation costs are to be covered by participants; the thematic network will cover lunches and coffee breaks.

A social dinner will also be organized on one of the evenings of the conference.