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«IZVESTIYA IRKUTSKOGO GOSUDARSTVENNOGO UNIVERSITETA». SERIYA «NAUKI O ZEMLE»
«THE BULLETIN OF IRKUTSK STATE UNIVERSITY». SERIES «EARTH SCIENCES»
ISSN 2073-3402 (Print)

List of issues > Series «Earth Sciences». 2025. Vol 54

Typification of the Relief of the Upper Angara Region Using Curvature Maps (Using the Example of the Irkut, Kitoy and Belaya River Basins)

Author(s)

M. Yu. Opekunova1,2, A. V. Bardash1

1 V. B. Sochava Institute of Geography SB RAS, Irkutsk, Russian Federation

2 Irkutsk National Research Technical University, Irkutsk, Russian Federation

Abstract
The results of a morphometric terrain analysis within the lower reaches of the left tributaries of the Angara River are presented. For the analysis, spatial differentiation of the values of profile, tangential, total and minimal surface curvatures was used. It was revealed that maps of curvatures of various types to varying degrees reflect the geological and geomorphic structure of the territory, the distribution of relief types, the distribution of erosion and accumulation zones at different topological levels. The possibility of using maps to highlight the boundaries of floodplain-terrace complexes, as well as mid-low mountain and flat relief types is shown. For Kitoy River, based on the map of minimal curvature, the relief was typified, which made it possible to obtain curvature values for different types of relief, including fluvial. A comparative analysis of surface curvatures within the valleys of the Belaya, Irkut, and Kitoy Rivers showed close average negative values of profile, total and minimal curvatures, characteristics of flat and concave micro-relief forms. Within the floodplain-terrace complexes of the main rivers considered, surfaces with curvature values above average, close to zero, predominate, which indicates the direction of accumulative processes and water retention during floods and flooding of the territory.
About the Authors

Opekunova Marina Yurievna, Candidate of Sciences (Geography), Senior Research Scientist, Laboratory of Geomorphology V. B. Sochava Institute of Geography SB RAS 1, Ulan-Batorskaya st., Irkutsk, 664033, Russian Federation Senior Researcher, Siberian School of Geosciences Irkutsk National Research Technical University 83, Lermontov st., Irkutsk, 664074, Russian Federation e-mail: opek@mail.ru

Bardash Alexander Vladimirovich, Candidate of Sciences (Geography), Research Scientist, Laboratory of Geomorphology V. B. Sochava Institute of Geography SB RAS 1, Ulan-Batorskaya st., Irkutsk, 664033, Russian Federation e-mail: olek22@mail.ru

For citation
Opekunova M.Yu., Bardash A.V. Typification of the Relief of the Upper Angara Region Using Curvature Maps (Using the Example of the Irkut, Kitoy and Belaya River Basins). The Bulletin of Irkutsk State University. Series Earth Sciences, 2025, vol. 54, pp. 57-71. https://doi.org/10.26516/2073-3402.2025.54.57 (in Russian)
Keywords
Upper Angara region, river valleys, surface curvature, erosion-accumulation processes.
UDC
551.4.012 (571.53)
DOI
https://doi.org/10.26516/2073-3402.2025.54.57
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