Long-term dynamics of velocities of horizontal channel erosions on the rivers of Udmurtia

I. I. Rysin; I. I. Grigorev; L. N. Petukhova; A. A. Perevoshchikov

doi:10.31857/S2949178924010033

Long-term dynamics of velocities of horizontal channel erosions on the rivers of Udmurtia

I. I. Rysin, I. I. Grigorev, L. N. Petukhova, A. A. Perevoshchikov

https://doi.org/10.31857/S2949178924010033

EDN: IRWCHB

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Abstract

The results of a study of channel displacement for 2000–2022 in 55 key areas located on rivers of different orders, draining across different landscapes of Udmurtia, are presented. The erosion rates were determined using benchmarks and tacheometric survey. To analyze the obtained results, the rivers were divided into 4 groups based on their order magnitude (according to the method of A. Scheidegger). Maximum erosion rate (up to 15 m/year) is typical for rivers of an order higher than 14, 6–8 m/year for medium rivers with an order of 9–14, 5.5 m/year for small rivers with an order of 6–9, and up to 4.2 m/year for very small rivers (of order 6 or less) under natural conditions and up to 8.1 m/year with man-made intervention. The mean annual and maximum amount of erosion were calculated for each reference areas for the period of observation. Correlation analysis showed a high significant relationship between the erosion rate and river order and, accordingly, the average annual and maximum discharges. The connection between the values of erosion and the annual amount of precipitation was found only for 3 small rivers within the Kilmez River basin. Trend analysis of erosion over a 23-year time interval was performed for the selected groups of rivers.

Keywords

river erosion rate, benchmarks, monitoring, correlation analysis, Udmurt Republic

About the Authors

I. I. Rysin

Udmurt State University
Russian Federation

I. I. Grigorev

Udmurt State University
Russian Federation

L. N. Petukhova

Udmurt State University
Russian Federation

A. A. Perevoshchikov

Udmurt State University
Russian Federation

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For citations:

Rysin I.I., Grigorev I.I., Petukhova L.N., Perevoshchikov A.A. Long-term dynamics of velocities of horizontal channel erosions on the rivers of Udmurtia. Geomorfologiya i Paleogeografiya. 2024;55(1):26-39. (In Russ.) https://doi.org/10.31857/S2949178924010033. EDN: IRWCHB