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dc.contributor.authorPelletier, Jon D.
dc.contributor.authorKapp, Paul A.
dc.contributor.authorAbell, Jordan
dc.contributor.authorField, Jason P.
dc.contributor.authorWilliams, Zachary C.
dc.contributor.authorDorsey, Rebecca J.
dc.date.accessioned2018-06-13T18:41:10Z
dc.date.available2018-06-13T18:41:10Z
dc.date.issued2018-04
dc.identifier.citationPelletier, J. D., Kapp, P. A., Abell, J., Field, J. P., Williams, Z. C., & Dorsey, R. J. (2018). Controls on yardang development and morphology: 1. Field observations and measurements at Ocotillo Wells, California. Journal of Geophysical Research: Earth Surface, 123, 694–722. https://doi.org/10.1002/2017JF004461en_US
dc.identifier.issn2169-9003
dc.identifier.doi10.1002/2017JF004461
dc.identifier.urihttp://hdl.handle.net/10150/627958
dc.description.abstractYardangs are streamlined hills formed in part by the erosive action of wind and wind-blown sediments. Here we examine the controls on yardang development and morphology using the Ocotillo Wells State Vehicular Recreation Area (OWSVRA), California, as a study site. We measured the compressive strengths, strikes, and dips of bedrock strata, eolian sediment fluxes (including their vertical profiles and spatial variations around yardangs), and erosion rates derived from geologic constraints and multitemporal Terrestrial Laser Scanning (TLS). We used a combination of TLS-based and airborne lidar-based Digital Elevation Models (DEMs) to test the applicability of an asymmetric Gaussian function for characterizing yardang form and quantify the relationships among yardang lengths, widths, heights, spacings, and their controlling factors. Yardang aspect ratios are controlled by bedrock structural attributes, specifically by the tangent of the dip and the angle between the strike and the prevailing wind direction. Yardang spacings scale linearly with yardang width. Yardang heights increase as the square root of width such that larger yardangs tend to have gentler side slopes. Sediment fluxes reach a maximum in the troughs among yardangs, consistent with the hypothesis that yardang development involves the focusing of wind and wind-blown sediments into troughs. The vertical distribution of eolian sediment flux follows a power law with an exponent of -2.5, a result consistent with an advection-diffusion-settling model of transport near the saltation-suspension transition. Erosion rates are several mm/yr over time scales of similar to 10(0) and similar to 10(6) years.en_US
dc.description.sponsorshipNSF [EAR-1323148]en_US
dc.language.isoenen_US
dc.publisherAMER GEOPHYSICAL UNIONen_US
dc.relation.urlhttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2017JF004461en_US
dc.rights©2018. American Geophysical Union. All Rights Reserved.en_US
dc.titleControls on Yardang Development and Morphology: 1. Field Observations and Measurements at Ocotillo Wells, Californiaen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Geoscien_US
dc.identifier.journalJOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACEen_US
dc.description.note6 month embargo; published online: 02 April 2018en_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US


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