We welcome abstracts on new observational systems for hydrosphere processes aiming to build digital twins for water management including atmosphere, soil, surface water or groundwater systems and related infrastructure. Improved monitoring of hydrological storages and fluxes is crucial for the development of new observational systems, modelling and analysis platforms. The processes measured on land, surface water and subsoil water, with novel technologies and integrated modelling platforms open new possibilities to observe the hydrosphere in various temporal scales, from sub-daily to long-term trends and extremities. Remotely sensed data including in-situ and mobile sensors are essential data source to support a digital revolution in hydrosphere processes studies and river basin management. We welcome presentations on digital twin development of different complexities and maturity levels for diverse water systems (river, groundwater, farmland, urban). Moreover, we welcome presentations on applications that integrate hydrological processes in natural and built environments for improved integrated water management using digital solutions to simulate reality and the various management challenges.