Preprints
https://doi.org/10.5194/acp-2022-485
https://doi.org/10.5194/acp-2022-485
12 Sep 2022
 | 12 Sep 2022
Status: this preprint was under review for the journal ACP but the revision was not accepted.

Characteristics of Aeolian sediments transported above a gobi surface

Zhengcai Zhang, Yan Zhang, and Kaijia Pan

Abstract. Most previous studies of aeolian sediment transport have focused on shifting sand surfaces. As a result, sediment transport above gobi (gravel) surfaces is still poorly understood. In this field study, we quantified this transport to provide important support for parameterizing aeolian sediment transport models. We found that the relationship between the Sorensen horizontal sediment transport (Qs) and shear velocity (u*) could be expressed as Qs = ρau*3 ⁄ g(1−u*t2 u*2)(α+γu*t u*u*t2/u*2), where α = –127.4, β = 714.4, and γ = 737.0. The relationship between the vertical sediment transport (F) and shear velocity could be expressed as Fd = CKρa (u*2u*2), where CK = 0.75. Although Q and F on gobi surfaces can be expressed similarly to previous results (i.e., similar equation forms), the coefficients were much larger than those for a shifting sand surface; that is, sediment transport was higher above the gobi. This difference resulted from the larger sand transport rate and saltation height above a gobi surface, and the larger transport and higher saltation height were related to gravel cover and soil crusts on the gobi surface.

Zhengcai Zhang, Yan Zhang, and Kaijia Pan

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on acp-2022-485', Xin Gao, 15 Oct 2022
  • RC1: 'Comment on acp-2022-485', Anonymous Referee #1, 07 Nov 2022
  • RC2: 'Comment on acp-2022-485', Anonymous Referee #3, 10 Dec 2022
  • AC3: 'Comment on acp-2022-485', Yan Zhang, 22 Dec 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on acp-2022-485', Xin Gao, 15 Oct 2022
  • RC1: 'Comment on acp-2022-485', Anonymous Referee #1, 07 Nov 2022
  • RC2: 'Comment on acp-2022-485', Anonymous Referee #3, 10 Dec 2022
  • AC3: 'Comment on acp-2022-485', Yan Zhang, 22 Dec 2022
Zhengcai Zhang, Yan Zhang, and Kaijia Pan
Zhengcai Zhang, Yan Zhang, and Kaijia Pan

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Latest update: 10 Apr 2024
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Short summary
In this study, we measured sediment transport by the wind above gobi surfaces in the field, and found high sand transport rates and saltation (hopping) heights above the gobi surfaces. The change of the transport rate with height could be expressed as a Gaussian peak function. The observed sediment transport results from the nature of the gravel surface and from soil crusts, which cause higher saltation above a gobi surface than above mobile sand.
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