Preface IV Vinogradov Conference "Hydrology: from learning to worldview" in memory of outstanding Russian hydrologist Yu. B. Vinogradov is held in Saint-Petersburg University (Russia). It has become a regular scientific platform for a free discussion on current problems in hydrology and the search for ways to overcome them, the synthesis of modern approaches in the study of hydrological processes and their application to solve fundamental and practical problems. A special aspect of the

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... e is the equal participation of young scientists: any scientific idea or result is considered and discussed from the standpoint of scientific significance and not the authority of the presenting scientist. Yu. B. Vinogradov (1932B. Vinogradov ( -2012 is one of the leading scientists of Russia in the field of hydrology. He is the author of numerous scientific studies, including several fundamental monographs on the mathematical modeling of hydrological processes, and catastrophic hydrological phenomena (flash floods and mudflows). Prof. Vinogradov developed a number of new modeling systems that describe the processes of river runoff formation, the formation and movement of mudflows, breakthroughs of moraine lakes, and erosion and pollution processes on the catchment. The Conference in memory of Prof. Vinogradov is held for the fourth time (following 2013, 2015, 2018).