Sander_Jomaa et al Catena 2017 Accepted.pdf (1.93 MB)
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Linear scaling of precipitation-driven soil erosion in laboratory flumes

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journal contribution
posted on 20.02.2017, 09:57 by Seifeddine Jomaa, D. Andrew Barry, M. Rode, Graham SanderGraham Sander, J.-Y. Parlange
The proportionality between raindrop-driven soil erosion delivery and area of soil exposed to raindrops under a uniform precipitation rate was investigated in terms of individual size classes using laboratory flume experiments. In particular, we examined the dependence of soil erosion on the area exposed to raindrop detachment. Twelve experiments were performed on the same laboratory flume, filled with the same soil. The experiments entailed different (constant) precipitation rates (28 and 74 mm h 1, 2-5 h duration) and various fractions of exposed surface (20, 30, and 40%, created using rock fragment cover). In addition, different initial soil conditions (dry hand-cultivated, wet sealed-compacted and dry compacted) were considered. The discharge rates and the sediment concentrations of seven individual size classes (< 2, 2-20, 20-50, 50-100, 100-315, 315-1000 and > 1000 µm) were measured at the flume exit. Results showed that the proportionality of soil erosion to the area exposed appears to always hold at steady state independently of the initial conditions and rainfall intensity. Across all experiments the data indicate that this proportionality holds approximately during entire erosive events and for all individual size classes. However, the proportionality for short times is less clear for the larger size classes as the data show that for these classes the erosion was sensitive to the soil’s antecedent conditions and further influenced by additional factors such as surface cohesion, surface compaction and soil moisture content.

Funding

This research was supported by SNF 144320

History

School

  • Architecture, Building and Civil Engineering

Published in

CATENA

Volume

152

Pages

285 - 291

Citation

JOMAA, S. ...et al., 2017. Linear scaling of precipitation-driven soil erosion in laboratory flumes. CATENA, 152, pp. 285-291.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

18/01/2017

Publication date

2017

Notes

This paper was published in the journal CATENA and the definitive published version is available at http://dx.doi.org/10.1016/j.catena.2017.01.025.

ISSN

0341-8162

Language

en