Аннотация:The paper presents the National Hydrological Modeling System (NHMS) developed as anelement of the adaptive hydrological monitoring system within the first stage of the Key InnovativeProject of National Importance (KIPNI) “The Unified National System for Monitoring Climate-ActiveSubstances” in 2022–2024. The structure, tools for informational and technological support of the NHMS,and the results of testing the system using observational data in the basins of large Russian rivers aredescribed. The paper describes algorithms for deriving the NHMS-based gridded hydrological reanalysis,which includes characteristics of the water regime of rivers, snow cover, and soil moisture based onhybridization of Roshydromet observational data with the NHMS simulations for pilot river basins ofthe Russian Federation. The possibility of using the NHMS and data of the hydrological reanalysis toimplement the second stage of the KIPNI in 2025–2030 and to provide informational support fordecision-making on adapting the water management sector of the Russian economy to climate change isunder discussion.
