DPTM simulation of aeolian sand ripple |
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Authors: | XiaoJing Zheng TianLi Bo and Li Xie |
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Institution: | (1) Key Laboratory of Mechanics on Western Disaster and Environment, Lanzhou University, Lanzhou, 730000, China |
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Abstract: | Aeolian sand ripple and its time evolution are simulated by the discrete particle tracing method (DPTM) presented in this
paper. The difference between this method and the current methods is that the former can consider the three main factors relevant
to the formation of natural aeolian sand ripples, which are the wind-blown sand flux above the sand bed formed by lots of
sand particles with different diameters, the particle-bed collision and after it the rebound and ejection of sand particles
in the sand bed, the saltation of high-speed sand particles and the creep of low-speed sand particles, respectively. The simulated
aeolian sand ripple is close to the natural sand ripple not only in basic shape and characteristic, particle size segregation
and stratigraphy, but also in formation stages. In addition, three important speeds can be obtained by this method, which
are the propagation speed of the saturated aeolian sand ripple and the critical frictional wind speeds of emergence and disappearance
of sand ripple.
Supported by the Key Project of the National Natural Science Foundation of China (Grant No. 10532040) |
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Keywords: | wind-blown sand flux aeolian sand ripple discrete particle tracing method (DPTM) mixed-particle-size creep |
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