Quantifying the form-flow-saltation dynamics of aeolian sand ripples
arXiv:2510.11876 · doi:10.1029/2025JF008616
Abstract
Ripples are the most fundamental and ubiquitous aeolian bedforms formed on sandy surfaces, but their small size and fast response times make them inherently difficult to measure. However, these attributes also make ripples excellent flow indicators, and they have been used extensively in planetary locations for this purpose. Here, we use terrestrial laser scanning to measure ripple morphometry and celerity coincidently, as well as saltation height above rippled surfaces. We find that although ripple height and wavelength respond linearly to increased shear velocity, under strong winds ripple celerity exhibits a non-linear increase. This relationship at high wind speeds is also reflected in the response of aerodynamic roughness and saltation dynamics, with a greater maximum saltation height present over ripple lee slopes. Importantly, when using ripple patterns as indicators of flow conditions, celerity or height should be used in preference to wavelength as their dynamics respond faster to changing wind speed. In planetary and stratigraphic settings where measuring celerity is not possible, wavelength should be considered as indicative of consistent wind conditions rather than the full range of sand transporting wind speeds.
References in corpus (12)
- Aeolian sans ripples: experimental study of saturated states
- A unified model of ripples and dunes in water and planetary environments
- Direct numerical simulations of aeolian sand ripples
- Unification of Aeolian and Fluvial Sediment Transport Rate from Granular Physics
- Nonlinear Dynamics of Aeolian Sand Ripples
- Aeolian sand transport: Scaling of mean saltation length and height and implications for mass flux scaling
- Coevolving aerodynamic and impact ripples on Earth
- Field evidence for the initiation of isolated aeolian sand patches
- Scaling laws for planetary sediment transport from DEM-RANS numerical simulations
- Hydrodynamic roughness induced by a multiscale topography
- Emergence of wind ripples controlled by mechanics of grain-bed impacts
- Aerodynamic roughness of rippled beds under active saltation at Earth-to-Mars atmospheric pressures