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Quantifying Turbulent Shear Stress in "Real" Landscapes

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University of Arizona Tucson United States

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Major Goals The wind velocity profile and the turbulent shear stresses exerted on the ground that drive aeolian sediment transport depend on the value of the aerodynamic roughness length, z0. The goal of this work was to better understand the controls on z0 values, especially in landscapes with multi-scale topography and in the presence of aeolian sediment transport. Multi-scale topography is ubiquitous in nature, yet previous empirical models for predicting z0 rely on the concept of a dominant roughness element or scale of roughness that must be assumed a priori. Aeolian transport has long been known to increase z0, but the relative importance of topography and sediment transport had not been determined under field conditions prior to this study.

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Technical Report,01 Jan 2015,30 Sep 2015



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Approved For Public Release;

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