Landscape-hydrologic systems and erosion processes across the middle Ob region

Abstract

The present paper considers landscape and hydrological systems and erosion processes in the middle Ob territory. In the monograph by A.N. Antipov and V.N. Fedotov [1], the middle Ob territory belongs to Ob-and-Irtysh forest-boggy, lowland accumulative landscape hydrological system of Western Siberia. In recent years, many significant events of natural character within the middle Ob territory (high level of floodwater in 2002, 2007 and 2015 and unusually warm and low water summer in 2003, 2012 and 2016) bring into focus the role of climatic changes. Variations of meteorological parameters provoke spikes in the development of the leading class of factors related to the complex of natural processes. A map of the key sector of the studied region is drawn to spatially visualize the structure of valley landscapes of the middle Ob region. Erosion processes are observed at the initiative station called “Ust-Vakhsky”. Within the sector of the station, the maximum bank recession rate measured by Tymen complex geological survey expedition in 1988 is 25 m/year, and the long-term average is 5.26 m/year (1983-1994). Long-term average annual bank recession rate by monitored cross section over 2002 - 2018 is 2.9 m/year. The maximum bank recession rate measured in 2004 is 17.5 m/year at the fifth cross section.