Universität zu Köln

Li, G., Zhang, J., Herrmann, H. J., Shao, Y. and Huang, N. (2020). Study of Aerodynamic Grain Entrainment in Aeolian Transport. Geophys. Res. Lett., 47 (11). WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 1944-8007

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Abstract

Aeolian transport controls landform formations on Earth and other planets and crucially affects the atmospheric system. With elaborate wind tunnel measurements, we find that the aerodynamic entrainment rate follows a yet unreported exponential increase in the intermittent regime and only complies with the expected linear law for the condition of continuous entrainment. Subsequently, we propose a model accounting for the effects of turbulence on aerodynamic entrainment based on the distribution of local shear stress to describe the experimental results. We also provide evidence that aerodynamic entrainment can be an efficient way to directly induce a horizontal grain transport comparable to the steady and saturated saltation in unsaturated conditions and should not be ignored. Our findings substantially modify the present interpretation of surface erosion and bear thus important consequences on future soil protection techniques.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Li, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhang, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Herrmann, H. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Shao, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Huang, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-329848
DOI:	10.1029/2019GL086574
Journal or Publication Title:	Geophys. Res. Lett.
Volume:	47
Number:	11
Date:	2020
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	1944-8007
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ARBITRARILY SLOPING BEDS; LOW SHIELDS STRESS; SALTATION; WIND; HYPOTHESIS; PARTICLES; LOAD Multiple languages Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/32984