ON THE CALCULATION OF THE SEDIMENT DELIVERY RATIO
https://doi.org/10.71367/3034-4638-2025-2-3-9-18
Abstract
A method for calculating the sediment delivery ratio during erosion in a small catchment area is proposed. A physically based model of soil erosion, transport and accumulation of sediments is used. The dependence of the erosion intensity on the amount of sediment particles transported in a given place is taken into account. If it is necessary to calculate the absolute values of erosion and accumulation, then the proposed model is well calibrated using measurement data, which allows it to be used for catchments for which there are measurement data for at least one runoff episode. If it is sufficient to know only the sediment delivery ratio, then this value is calculated by the relative values of erosion and accumulation and is practically independent of the absolute erosion rate. The main factor is the non-eroding flow velocity, the value of which is quite definitely assigned by formulas and does not require calibration. This allows calculating the sediment delivery coefficient based on a relatively small number of input characteristics of the relief, water runoff and soil and vegetation cover. The absence of the need for precise calibration makes the proposed model convenient for practical application, as well as for studying the dependencies of the sediment delivery ratio on the factors influencing it.
Supporting agencies: The study was conducted under the state assignment of the Research laboratory of soil erosion and fluvial processes, Faculty of Geography, Lomonosov Moscow State University (project no. 121051200166-4). The author is deeply grateful to L.F. Litvin and V.N. Golosov for providing the measurement data at the Satinsky test site and also to two reviewers whose comments helped improve the text of the article.
About the Author
A. Yu. Sidorchuk
Lomonosov Moscow State University, Faculty of Geography
Russian Federation
Russian Federation
Sidorchuk Alexey Yuryevich, Doctor of Sciences, PhD, Principal Scientist
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Review
For citations:
Sidorchuk A.Yu. ON THE CALCULATION OF THE SEDIMENT DELIVERY RATIO. Eroziya pochv i ruslovye processy. 2025;(3):8-18. (In Russ.) https://doi.org/10.71367/3034-4638-2025-2-3-9-18
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