Anomalous Diffusion of Sand Tracer Particles Under Waves

Citeable URL: https://ir.library.oregonstate.edu/concern/articles/2v23w0856

Descriptions

Attribute Name	Values
Creator	Wilson, Gregory W.
Abstract	A model is presented for the horizontal and vertical diffusion of sand tracer particles by waves and is verified using a reanalysis of the experiments of Miller and Komar (1979, ). In the model, sand particles take random jumps at a rate associated with the wave period but also can bury one another resulting in intermittent long rest times between jumps. The particle jump length between burials is modeled by considering a vortex entrainment and advection mechanism, resulting in a probability distribution as a function of wave orbital excursion amplitude and particle settling velocity. The model is formalized using the theory of continuous time random walks to obtain closed-form expressions for the horizontal particle spreading rate, and plume shape, without tunable parameters. Importantly, the model predicts subdiffusive particle spreading, a previously unconsidered phenomenon that is apparent in the experimental data. The plume horizontal extent versus time is also well predicted compared to experimental data.
License	Attribution 4.0 (CC BY 4.0)
Resource Type	Article
DOI	https://doi.org/10.1029/2018JF004780
Date Issued	2018-11
Journal Title	Journal of Geophysical Research: Earth Surface
Journal Volume	123
权利声明	In Copyright
Language	English [eng]
ISSN	2169-9003