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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union

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Nonlin. Processes Geophys., 24, 569-579, 2017
https://doi.org/10.5194/npg-24-569-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
28 Sep 2017
Quantifying the changes of soil surface microroughness due to rainfall impact on a smooth surface
Benjamin K. B. Abban1, A. N. (Thanos) Papanicolaou1,5, Christos P. Giannopoulos1, Dimitrios C. Dermisis2, Kenneth M. Wacha3, Christopher G. Wilson1, and Mohamed Elhakeem4 1Hydraulics and Sedimentation Lab, Department of Civil & Environmental Engineering, University of Tennessee – Knoxville, Knoxville, TN 37996, USA
2College of Engineering, Department of Chemical, Civil & Mechanical Engineering, McNeese State University, Lake Charles, LA 70605, USA
3USDA-ARS – National Laboratory for Agriculture and the Environment, Ames, IA 50011, USA
4Abu Dhabi University, Abu Dhabi, P.O. Box 59911, Abu Dhabi, United Arab Emirates
5Tennessee Water Resources Center, Knoxville, TN 37996, USA
Abstract. This study examines the rainfall-induced change in soil microroughness of a bare smooth soil surface in an agricultural field. The majority of soil microroughness studies have focused on surface roughness on the order of ∼ 5–50 mm and have reported a decay of soil surface roughness with rainfall. However, there is quantitative evidence from a few studies suggesting that surfaces with microroughness less than 5 mm may undergo an increase in roughness when subject to rainfall action. The focus herein is on initial microroughness length scales on the order of 2 mm, a low roughness condition observed seasonally in some landscapes under bare conditions and chosen to systematically examine the increasing roughness phenomenon. Three rainfall intensities of 30, 60, and 75 mm h−1 are applied to a smoothened bed surface in a field plot via a rainfall simulator. Soil surface microroughness is recorded via a surface-profile laser scanner. Several indices are utilized to quantify the soil surface microroughness, namely the random roughness (RR) index, the crossover length, the variance scale from the Markov–Gaussian model, and the limiting difference. Findings show a consistent increase in roughness under the action of rainfall, with an overall agreement between all indices in terms of trend and magnitude. Although this study is limited to a narrow range of rainfall and soil conditions, the results suggest that the outcome of the interaction between rainfall and a soil surface can be different for smooth and rough surfaces and thus warrant the need for a better understanding of this interaction.

Citation: Abban, B. K. B., Papanicolaou, A. N. (., Giannopoulos, C. P., Dermisis, D. C., Wacha, K. M., Wilson, C. G., and Elhakeem, M.: Quantifying the changes of soil surface microroughness due to rainfall impact on a smooth surface, Nonlin. Processes Geophys., 24, 569-579, https://doi.org/10.5194/npg-24-569-2017, 2017.
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We examine rainfall-induced change in soil microroughness of bare soil surfaces in agricultural landscapes with initial microroughness length scales on the order of 2 mm (smooth surfaces). Past studies have focused on scales of 5–50 mm and have reported a decrease in miccroroughness. Findings in this study show a consistent increase in microroughness under rainfall action for initial length scales of 2 mm. Thus, rainfall–surface interactions can be different for smooth and rough surfaces.
We examine rainfall-induced change in soil microroughness of bare soil surfaces in agricultural...
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