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    Controls on Yardang Development and Morphology: 2. Numerical Modeling

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    Pelletier-2018-Journal_of_Geop ...
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    Author
    Pelletier, Jon D.
    Affiliation
    Univ Arizona, Dept Geosci
    Issue Date
    2018-04
    
    Metadata
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    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    Pelletier, J. D. (2018). Controls on yardang development and morphology: 2. Numerical modeling. Journal of Geophysical Research: Earth Surface, 123, 723–743. https://doi.org/10.1002/2017JF004462
    Journal
    JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
    Rights
    ©2018. American Geophysical Union. All Rights Reserved.
    Collection Information
    This 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.
    Abstract
    Here I present a set of mathematical modeling results, constrained by the results of the companion paper, aimed at improving our understanding of yardang development and controls on yardang morphology. The classic model for yardang development posits that yardangs evolve to an aspect ratio of approximate to 4 in order to minimize aerodynamic drag. Computational fluid dynamics model results presented here, however, demonstrate that yardangs with an aspect ratio of 4 do not minimize drag. As an alternative, I propose that yardang aspect ratios are primarily controlled by the lateral downwind expansion of wind and wind-blown sediments focused into the troughs among yardangs, which can be quantified using previous studies of wall-bounded turbulent jets. This approach predicts yardangs with aspect ratios in the range of 5 to 10, that is, similar to those of natural yardangs. In addition to aerodynamics, yardang aspect ratios are influenced by the strikes and dips of strata, as demonstrated in the companion paper. To better understand the aerodynamic and bedrock structural controls on yardang morphology, I developed a landscape evolution model that combines the physics of boundary layer flow and abrasion by eolian sediment transport with a model for the erosion of the tops and lee sides of yardangs by water-driven erosional processes. Yardang formation in the model is enhanced in substrates with greater heterogeneity (i.e., alternating strong and weak strata). Yardang morphology is controlled by the strikes and dips of strata as well as the topographic diffusivity associated with water-driven erosional processes.
    Note
    6 month embargo; published online: 02 April 2018
    ISSN
    2169-9003
    DOI
    10.1002/2017JF004462
    Version
    Final published version
    Sponsors
    NSF [1323148]
    Additional Links
    https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2017JF004462
    ae974a485f413a2113503eed53cd6c53
    10.1002/2017JF004462
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