- Conference date: 30 June–3 July 2011
- Location: Guangzhou, (China)
Numerical simulations of one dimensional unsteady sand saltation show that the transport rate’s response depends on the amplitude and frequency and waveform of wind variations. Calculations show that the unsteady transport rates in sequences of periodic velocity variations are larger than the steady transport rates of the same mean wind velocity if the average wind velocity is much larger than the threshold velocity. When the frequency of wind fluctuating falls into the range of 0.05‐10 Hz, increases as gusty wind frequency increases. Comparisons of transport rate in sequences of square wave and triangular wave with sinusoidal wind variations show that, at the same amplitude, square wave wind variations lead to the largest transport rate and triangular wave wind variations lead to the smallest. The error caused by the threshold wind velocity is in the direction opposite to that caused by amplitude and frequency. It might therefore, cancel the amplification and thus cause the transport rate to be overestimated if the fraction of time, where the wind velocity is below the threshold value, is larger than zero.
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