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Journal Articles Journal of Geophysical Research: Earth Surface Year : 2022

Aeolian erosion thresholds for cohesive sand

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Moisture is known to affect sand cohesion and therefore transport threshold and rate of aeolian sand transport. Aeolian sand transport has been widely documented for dry sand beds, but much more sparsely in the context of moist sand beds. One major challenge in the collection of reliable field or laboratory data for moist sand is to have an accurate control of the moisture level within the sand bed, which is prone to strongly vary over time and space due to evaporation. To suppress the variability of moisture content due to evaporation, we devised a new approach based on the use of a non-volatile liquid (namely silicon oil instead of water) which ensures a proper control of the liquid content. We thus conducted wind-tunnel experiments employing this approach and observed that the aerodynamic threshold friction velocity increases linearly with liquid content, while the dynamic threshold is found to be unchanged in the range of cohesion strength investigated in this study. These outcomes indicate that the difference between the static and dynamic threshold increases with increasing cohesion. This may have strong implications on aeolian transport of moist sand, and in particular on hysteretic behaviors.
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hal-03872406 , version 1 (25-11-2022)


Attribution - CC BY 4.0



Jean-Baptiste Besnard, Pascal Dupont, Ahmed Ould El Moctar, Alexandre Valance. Aeolian erosion thresholds for cohesive sand. Journal of Geophysical Research: Earth Surface, 2022, 127 (11), pp.e2022JF006803. ⟨10.1029/2022JF006803⟩. ⟨hal-03872406⟩
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