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Intermittency of aeolian saltation.

Zhen-Ting Wang1, Chun-Lai Zhang, Hong-Tao Wang

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This study quantifies sand grain saltation intermittency using high-speed imaging. Findings reveal saltation is not random at short timescales, prompting further research into its formation mechanisms.

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Area of Science:

  • Geophysics
  • Fluid Dynamics
  • Physics

Background:

  • Saltation is a key process in sediment transport.
  • Understanding the intermittent nature of saltation is crucial for accurate modeling.

Purpose of the Study:

  • To quantitatively describe the intermittency of sand grain saltation.
  • To investigate the statistical properties of saltation dynamics.

Main Methods:

  • High-speed imaging at very high frequency in a wind tunnel.
  • Definition of a Heaviside-type function to characterize intermittency.
  • Analysis of kurtosis, periodicity, and autocorrelation of volume concentration time series.

Main Results:

  • A Heaviside-type function was developed to quantify saltation intermittency.
  • Kurtosis and periodicity were identified as statistical indicators of intermittency.
  • Strong autocorrelation in volume concentration time series indicates non-random saltation at subsecond timescales.

Conclusions:

  • Sand grain saltation exhibits significant intermittency.
  • Saltation dynamics are not entirely random at subsecond timescales.
  • The underlying turbulent structures driving intermittent saltation require further investigation.