A two-species continuum model for aeolian sand ripples
Rebecca B. Hoyle, Anita Mehta
TL;DR
This paper introduces a continuum model for aeolian sand ripples with two grain species, predicting ripple characteristics analytically and demonstrating realistic ripple evolution through simulations.
Contribution
It presents a novel two-species continuum model for sand ripples, combining analytical predictions with numerical simulations.
Findings
Analytical prediction of ripple wavelength and growth rate.
Identification of threshold saltation flux for ripple formation.
Simulation of realistic ripple profile evolution.
Abstract
We formulate a continuum model for aeolian sand ripples consisting of two species of grains: a lower layer of relatively immobile clusters, with an upper layer of highly mobile grains moving on top. We predict analytically the ripple wavelength, initial ripple growth rate and threshold saltation flux for ripple formation. Numerical simulations show the evolution of realistic ripple profiles from initial surface roughness via ripple growth and merger.
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