New insights into the wind-dust relationship in sandblasting and direct aerodynamic entrainment from wind tunnel experiments

Handle URI:
http://hdl.handle.net/10754/594985
Title:
New insights into the wind-dust relationship in sandblasting and direct aerodynamic entrainment from wind tunnel experiments
Authors:
Parajuli, Sagar Prasad; Zobeck, Ted M.; Kocurek, Gary; Yang, Zong-Liang; Stenchikov, Georgiy L. ( 0000-0001-9033-4925 )
Abstract:
Numerous parameterizations have been developed for predicting wind erosion, yet the physical mechanism of dust emission is not fully understood. Sandblasting is thought to be the primary mechanism, but recent studies suggest that dust emission by direct aerodynamic entrainment can be significant under certain conditions. In this work, using wind tunnel experiments, we investigated some of the lesser understood aspects of dust emission in sandblasting and aerodynamic entrainment for three soil types, namely clay, silty clay loam, and clay loam. First, we explored the role of erodible surface roughness on dust emitted by aerodynamic entrainment. Second, we compared the emitted dust concentration in sandblasting and aerodynamic entrainment under a range of wind friction velocities. Finally, we explored the sensitivity of emitted dust particle size distribution (PSD) to soil type and wind friction velocity in these two processes. The dust concentration in aerodynamic entrainment showed strong positive correlation, no significant correlation, and weak negative correlation, for the clay, silty clay loam, and clay loam, respectively, with the erodible soil surface roughness. The dust in aerodynamic entrainment was significant constituting up to 28.3, 41.4, and 146.4% compared to sandblasting for the clay, silty clay loam, and clay loam, respectively. PSD of emitted dust was sensitive to soil type in both sandblasting and aerodynamic entrainment. PSD was sensitive to the friction velocity in aerodynamic entrainment but not in sandblasting. Our results highlight the need to consider the details of sandblasting and direct aerodynamic entrainment processes in parameterizing dust emission in global/regional climate models.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
New insights into the wind-dust relationship in sandblasting and direct aerodynamic entrainment from wind tunnel experiments 2016:n/a Journal of Geophysical Research: Atmospheres
Publisher:
Wiley-Blackwell
Journal:
Journal of Geophysical Research: Atmospheres
Issue Date:
22-Jan-2016
DOI:
10.1002/2015JD024424
Type:
Article
ISSN:
2169897X
Additional Links:
http://doi.wiley.com/10.1002/2015JD024424
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorParajuli, Sagar Prasaden
dc.contributor.authorZobeck, Ted M.en
dc.contributor.authorKocurek, Garyen
dc.contributor.authorYang, Zong-Liangen
dc.contributor.authorStenchikov, Georgiy L.en
dc.date.accessioned2016-01-27T13:17:06Zen
dc.date.available2016-01-27T13:17:06Zen
dc.date.issued2016-01-22en
dc.identifier.citationNew insights into the wind-dust relationship in sandblasting and direct aerodynamic entrainment from wind tunnel experiments 2016:n/a Journal of Geophysical Research: Atmospheresen
dc.identifier.issn2169897Xen
dc.identifier.doi10.1002/2015JD024424en
dc.identifier.urihttp://hdl.handle.net/10754/594985en
dc.description.abstractNumerous parameterizations have been developed for predicting wind erosion, yet the physical mechanism of dust emission is not fully understood. Sandblasting is thought to be the primary mechanism, but recent studies suggest that dust emission by direct aerodynamic entrainment can be significant under certain conditions. In this work, using wind tunnel experiments, we investigated some of the lesser understood aspects of dust emission in sandblasting and aerodynamic entrainment for three soil types, namely clay, silty clay loam, and clay loam. First, we explored the role of erodible surface roughness on dust emitted by aerodynamic entrainment. Second, we compared the emitted dust concentration in sandblasting and aerodynamic entrainment under a range of wind friction velocities. Finally, we explored the sensitivity of emitted dust particle size distribution (PSD) to soil type and wind friction velocity in these two processes. The dust concentration in aerodynamic entrainment showed strong positive correlation, no significant correlation, and weak negative correlation, for the clay, silty clay loam, and clay loam, respectively, with the erodible soil surface roughness. The dust in aerodynamic entrainment was significant constituting up to 28.3, 41.4, and 146.4% compared to sandblasting for the clay, silty clay loam, and clay loam, respectively. PSD of emitted dust was sensitive to soil type in both sandblasting and aerodynamic entrainment. PSD was sensitive to the friction velocity in aerodynamic entrainment but not in sandblasting. Our results highlight the need to consider the details of sandblasting and direct aerodynamic entrainment processes in parameterizing dust emission in global/regional climate models.en
dc.language.isoenen
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://doi.wiley.com/10.1002/2015JD024424en
dc.rightsThis is the peer reviewed version of the following article: Parajuli, S. P., T. M. Zobeck, G. Kocurek, Z.-L. Yang, and G. L. Stenchikov (2016), New insights into the wind-dust relationship in sandblasting and direct aerodynamic entrainment from wind tunnel experiments, J. Geophys. Res. Atmos., 121, which has been published in final form at http://doi.wiley.com/10.1002/2015JD024424. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.en
dc.titleNew insights into the wind-dust relationship in sandblasting and direct aerodynamic entrainment from wind tunnel experimentsen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Geophysical Research: Atmospheresen
dc.eprint.versionPost-printen
dc.contributor.institutionThe University of Texas at Austin, Jackson School of Geosciences, Austin Texas USAen
dc.contributor.institutionU.S. Department of Agriculture (USDA), Agricultural Research Service (ARS), Lubbock Texas USAen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorStenchikov, Georgiy L.en
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