EGU2020-7985
https://doi.org/10.5194/egusphere-egu2020-7985
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Fluidized-bed: As an alternative method for rill erodibility modeling

Selen Deviren Saygin1, Fikret Ari2, Cagla Temiz3, Sefika Arslan4, Mehmet Altay Unal5, and Gunay Erpul6
Selen Deviren Saygin et al.
  • 1Department of Soil Science and Plant Nutrition, Faculty of Agriculture, University of Ankara, 06110 Diskapi/Ankara, Turkey (sdeviren@agri.ankara.edu.tr; Cagla.Atasoy@ankara.edu.tr; sefikaarslan77@gmail.com; erpul@ankara.edu.tr )
  • 2Department of Electrical and Electronics Engineering, Faculty of Engineering, University of Ankara, 06830 Golbasi/Ankara, Turkey (fikret.ari@eng.ankara.edu.tr)
  • 3Department of Soil Science and Plant Nutrition, Faculty of Agriculture, University of Ankara, 06110 Diskapi/Ankara, Turkey (Cagla.Atasoy@ankara.edu.tr)
  • 4Department of Soil Science and Plant Nutrition, Faculty of Agriculture, University of Ankara, 06110 Diskapi/Ankara, Turkey (sefikaarslan77@gmail.com)
  • 5Biotechnology Enstitute, University of Ankara, 06560 Besevler/Ankara, Turkey (unala@ankara.edu.tr)
  • 6Department of Soil Science and Plant Nutrition, Faculty of Agriculture, University of Ankara, 06110 Diskapi/Ankara, Turkey (erpul@ankara.edu.tr )

Rill erodibility (Kr), which is a measure of the resistance of soil particles against disintegration in a rill under concentrated flow conditions, is a significant characteristic for rill initiation in a field.  The Process-based WEPP (Water Erosion Prediction Project) originally models Kr by linear excess shear stress (τ), and it is mostly obtained from mini-flume experiments at laboratory conditions. Alternatively, a critical value of flow stress (τcr) that points to fragmentation in rills can be modeled by a fluidized bed approach that quantifies the conditions in terms of cohesion (Co) and flow velocity (Vf) by considering the soil as a cohesive material. In there, the water as a fluid applies pressure on solid particle proportional to flow rate of the fluid (v). But, performed related studies on it were mostly tested for the limited soil types. The objectives of this study were to test these relationships and model the rill characteristic for the heavy textures of different soil types and investigate the role of basic soil properties on rill initiation. Experimental results showed that the stronger regression coefficient (R2=0.78) was found between Kr and flow velocity (Vf) monitored at the fluidization stage than that between Co & τcr at the studied soil conditions. However, correlations between constant and dynamic soil properties and the measured Kr, τcr, Co and Vf values were also quite remarkable (p<0.01) for next-generation modeling studies in terms of rill dynamics. It is believed that the fluidized-bed approach has a great potential to model Kr and encouragingly it is worth to be tested with wider data-sets under different soil-moisture conditions.

Keywords: Rill erodibility, Soil Cohesion, Fluidized bed approach, WEPP

How to cite: Deviren Saygin, S., Ari, F., Temiz, C., Arslan, S., Unal, M. A., and Erpul, G.: Fluidized-bed: As an alternative method for rill erodibility modeling, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-7985, https://doi.org/10.5194/egusphere-egu2020-7985, 2020

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