BYU

Abstract by Eric Lenhart

Personal Infomation


Presenter's Name

Eric Lenhart

Degree Level

Undergraduate

Abstract Infomation


Department

Physics and Astronomy

Faculty Advisor

Manuel Berrondo
Jani Radebaugh

Title

How self-organizing ripples form across particulate surfaces

Abstract

We investigated how air flow forms self-organizing patterns such as ripples across loose particulate surfaces. In particular, we analyzed various models of sand transport--particularly Nishimori’s Model--and noted the effects of altering various parameters. By varying the saltation length, multiple simultaneous modes in the wavelength were observed in the simulation and confirmed empirically near Pavante Butte, Utah. Y-junctions were also measured to determine the consensus and frustration of the model. As an additional use of the model, I measured terrestrial gravel ripples in the Lut Desert, Iran, finding an average length of 50.0 m and a right-skewed distribution. Using these data, I demonstrate that for these gravel ripples, particle movement has a larger dependence on initial height than for smaller, more common sand ripples.