Abstract: The aim of the work is to create a dynamic picture of the development of the forms of research of the USSR Academy of Sciences in Yakutia in 1947-1991. The initial chronological boundary is connected with the organization of the Yakut base of the USSR Academy of Sciences. The final boundary is due to the reformatting of the USSR Academy of Sciences into the Russian Academy of Sciences. The research is based on the involvement of documents from the archives of the Yakut Scientific Center of the Siberian Branch of the Russian Academy of Sciences, the Archive of the P.I. Melnikov Permafrost Institute of the Siberian Branch of the Russian Academy of Sciences, the Current Archive of the Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy of the Siberian Branch of the Russian Academy of Sciences (Yakutsk), the Scientific Archive of the Siberian Branch of the Russian Academy of Sciences (Novosibirsk), the Archive of the Russian Academy of Sciences (Moscow), as well as information presented in the available scientific literature. When processing the accumulated materials, special historical methods of scientific cognition were used (the principle of historicism, historical-typological, historical-comparative and historical-genetic methods, etc.). For the first time in historiography, a characteristic of the development of forms of organization of academic research in Yakutia in the period 1947–1991 is presented. It is noted that during the period considered in the article, the forms of organization of academic research in Yakutia have received significant development. The expedition surveys of the staff of the USSR Academy of Sciences were continued, which were carried out with greater intensity than before. An important place was occupied by stationary research, which unfolded on a network of hospitals in various parts of Yakutia. In addition, experimental and design work carried out in academic institutions established in the region was characterized by a number of achievements. This state of affairs has allowed the academic center to conduct a complex of largely unique research focused not only on obtaining fundamental, but also applied, of serious practical importance, results.

Keywords: North, experimental work, design work, expeditions, stationary surveys, scientific research, The USSR Academy of Sciences, Yakutia, Arctic, academic institutions

Abstract: The purpose of this study is to identify optimal strategies for the survival and development of small settlements in the Arctic region facing threats of a sharp change in the water balance of adjacent territories caused by Climatic changes. The territory of Yakutia occupies majority areas not only in the Arctic zone of Russia, but also in the world. The impact of Climate change in Yakutia will accordingly affect the local, regional, Russian and global levels. As an illustrative example, the small Yakut village of Khotochu, located on the banks of the Lena river and regularly exposed to the threat of flooding, is taken. To this end, the authors of this study collected materials from the archive of the municipality "Zhemkonsky 1st nasleg", which includes the village of Khotochu, official documents of departmental organizations, annual reports of heads of municipalities and already published scientific articles. Also in September 2021, field materials (interviews and questionnaire survey data) were collected directly in the village and in the surrounding areas. As a result, the authors identified the current socio-economic situation of this settlement, its history, the main problems faced by the villagers, the measures taken by administrative authorities at various levels, as well as the opinion of local residents. The vulnerability of the village of Khotochu to the negative consequences of water resources is characterized. Based on the study of the experience of adaptation of the residents of the village of Khotochu to the floods of the twentieth century, the decisions taken by the authorities to ensure the safety of population in Yakutia, based on the results of the study, recommendations were made to administrative and governing bodies of various levels to minimize hydrological risks and adopt more effective adaptive strategies.

Keywords: agriculture practices, adaptation strategies, hydrological risks, permafrost, floods, Climate change, the Lena river, Khotochu, Yakutia, The Arctic

Abstract: This article describes the history of scientific applied study of water regime of rivers of the Russian sector of Arctic region in the XX-XXI centuries. The authors highlight the stages and key vectors of priority research, which, at different times were substantiated by the need for ensuring functionality of the Northern Sea Route and transport arteries of navigable waterways, usage and consumption of water actively developing since the second half of the XX century, examination and forecasting of the consequences of global warming, emergence of the new methods of data collection and processing, physical-mathematical modeling of hydrological processes.. The article presents a detailed analysis on largest Arctic rivers, as well as synthesis of works containing the estimation of their runoff, regional water resources, consistencies and factors of space-time fluctuation, including under the influence of the increasing climate changes and anthropogenic load. Another segment of research is formed by the studies of the transformation of runoff, water regime and dynamics of waters in the mouths of Arctic rivers.

Keywords: long-term changes in flow, water management, climate change, field research, water dynamics, water regime of rivers, Arctic, river mouth areas, flow modeling, forecasts

Abstract: The ice phenomena on the Arctic rivers often cause hazardous hydrological conditions and processes: ice-clogging floods and ice dams; damage of hydraulic structures and the fleet during the spring ice run. In winter, the rivers are used for navigation and construction of ice crossings. The article demonstrates the key stages in studying the ice regime of Arctic Zone rivers in the XX century. The author examines the peculiarities of establishment of the monitoring system and methods of ice forecasts in the conditions of limited network of hydrological posts. The research presents the main approaches for assessing the possible changes in the characteristics of river ice regime, flowing in the severe climatic conditions, with variable anthropogenic impact and different scenarios of climate change. The most promising directions of the modern river ice research of in Russia and foreign countries are highlighted: the use of satellite imagery data; the development of new approaches in ice forecasts; assessment of the response of ice regime to the climate change. It is demonstrated that the advancement of these directions is possible on the basis of national and global experience.

Keywords: river-ice forecasts, river-ice monitoring, dangerous ice phenomena, Arctic rivers, the history of Arctic exploration, climate change, the Arctic, river ice, satellite imagery, future changes in river ice

Abstract: The author of the article considers the formation of the polar marinism concept and describes the biography of N.A. Kulik, a bright and original researcher of the Arctic. Almost without supporters, he defended the ideas of marinism in the first quarter of the 20th century, when the ideas of "glacialists" seemed to have defeated the ideas of "marinists". The article contains the facts, on which the views of N.A. Kulik as a marine scientist were formed. Boulder loams have been the subject of scientific discussion for 300 years. The article presents the views of particular scientists who prove the correctness of the ideas of marinism.The article highlights the scientific merits of N.A. Kulik in substantiating the paleogeography of the post-Pliocene of the Arctic. He supported the new methods of studying boulder loam (foraminiferal analysis), applied the ideas of A.P. Karpinsky about alternating-latitudinal-meridional oscillations of the earth’ crust and the related climate changes the glaciation in the north. He raised the question of the southern boundary of continental and marine morains, defended the idea of glaciation during the marine transgression. N.A. Kulik had revived the scientific ideas of modern marinism.

Keywords: marine moraine, post-Pliocene sediments, glacial cover, transgression, marinism, boulder loam, sea shells, glacialism, the Arctic, Pechora lowland