The influence of wind velocity and sand grain diameter on the falling velocities of sand particles

Bo, Tang; Zheng, Xiaojing; Duan, Shao-Zhen; Liang, Yi-Rui

doi:10.1016/j.powtec.2013.02.043

Cited by 6 publications

(11 citation statements)

References 27 publications

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“…Aeolian transport processes not only sort material in transit, but also influence the nature of the bed as a consequence of selective erosion and deposition. Consequently, grain-size variations in the parent sand bed could then affect aeolian transport processes, including transport rate, structure of blown sand flux, threshold wind velocity, particle collision and distribution of concentrations, as well as velocity and energy of the saltating grains (Dong et al, 2003a;Liu & Dong, 2004;Yang et al, 2007;Li et al, 2008;Xing & He, 2013;Bo et al, 2013). In addition, grain-size differences in a parent sand bed that become apparent before and after aeolian sand entrainment will increase with increasing wind velocity and result in a corresponding decrease in the availability of certain size fractions.…”

Section: Variation In Grain Size Of Parent Sand Bedsmentioning

confidence: 99%

“…Due to the complex and microscopic exchanges of mass and energy among saltating grains, surface grains and airflow, studying vertical variations in GSD is an effective method for understanding the motion processes of sand grains (Farrell et al ., ; Tan et al ., ). In turn, variations in the GSD with height can affect the velocity distribution, momentum and concentration of sand grains in the saltation layer (Liu & Dong, ; Yang et al ., ; Li et al ., ; Bo et al ., ; Xing & He, ), as well as the GSD of the parent sands, thereby influencing grain trajectories and transport rates and modify the near‐bed airflow (Dong et al ., ,; Yang et al ., ; Feng et al ., ). In addition, different grain‐size groups in the saltation layer have diverse trajectory angles and velocities as they return to the surface, which could affect the motion of other sand grains in the parent sands (Cheng et al ., ; Bo et al ., ; Kang et al ., ).…”

Section: Introductionmentioning

confidence: 99%

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Aerodynamic grain‐size distribution of blown sand

Yang

Liu

et al. 2018

Sedimentology

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Aeolian sand entrainment, saltation and deposition are important and closely related near surface processes. Determining how grains are sorted by wind requires a detailed understanding of how aerodynamic sand transport processes vary within the saltating layer with height above the bed. Grain‐size distribution of sand throughout the saltation layer and, in particular, how the associated flux of different grain size changes with variation in wind velocity, remain unclear. In the present study, a blowdown wind tunnel with a 50 cm thick boundary layer was used to investigate saltating sand grains by analyzing the weight percentage and transport flux of different grain‐size fractions and the mean grain size at different wind velocities. It was found that mean grain size decreases with height above the sand bed before undergoing a reversal. The height of the reversal point ranges from 4 to 40 cm, and increases with wind velocity following a non‐linear relationship. The content of the finer fractions (very fine and fine sand) initially increases above the sand bed and then decreases slightly with height, whereas that of the coarser fractions (medium and coarse sand) exhibits the opposite trend. The content of coarser grains and the mean grain size of sand in the saltation layer increase with wind velocity, indicating erosional selectivity with respect to grains in multi‐sized sand beds; but this size selectivity decreases with increasing wind velocity. The vertical mass flux structure of fine sand and very fine sand does not obey a general exponential decay pattern under strong wind conditions; and the coarser the sand grain, the greater the decrease rate of their transport mass with height. The results of these experiments suggest that the grain‐size distribution of a saltating sand cloud is governed by both wind velocity and height within the near‐surface boundary layer.

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Section: Variation In Grain Size Of Parent Sand Bedsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aerodynamic grain‐size distribution of blown sand

Yang

Liu

et al. 2018

Sedimentology

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“…For example, the critical height in Yang et al (2010) and Durán et al (2011) was 5D p , which is not the value on the bed. Velocity above or within a certain height is often given in experimental measurements, indicating that the impact velocity increases with wind speed (Bo et al, 2013b;Cheng et al, 2009;Dong et al, 2002;Nalpanis et al, 1993). Among them, Nalpanis et al (1993) used a photographic method, in which particle information at low heights (e.g., <5 mm) is difficult to infer.…”

Section: Impact Velocity and Anglementioning

confidence: 99%

“…(2009) and Bo et al. (2013b) used particle information within height ranges of 0–10 and 0–2 mm to obtain impact velocity; this included particle movement above the bed surface.…”

Section: Grain‐scale Distributions In Wind‐blown Sandmentioning

confidence: 99%

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Characterization of Wind‐Blown Sand With Near‐Wall Motions and Turbulence: From Grain‐Scale Distributions to Sediment Transport

2021

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Reliable prediction of wind-blown sand movement in the natural environment is of major importance for studies of aeolian landforms and wind erosion control. Sand movement can be roughly divided into four main physical processes: (a) the initiation of surface particles by aerodynamic entrainment, (b) the subsequent trajectories of particles, (c) the splashing and rebounding of particles by impacting processes, and (d) modification of the wind profile by saltating particles (Anderson & Haff, 1991;Bagnold, 1941;Kok & Renno, 2009). Thus, characterization of particle movement in wind-blown sand requires an understanding of several key physical variables, including the impact and lift-off parameters of particles and transport flux

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Using soil minerals to investigate desert expansion in northern Shaanxi Province, China

Chen

Shukla

et al. 2020

Aeolian Research

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The influence of wind velocity and sand grain diameter on the falling velocities of sand particles

Cited by 6 publications

References 27 publications

Aerodynamic grain‐size distribution of blown sand

Aerodynamic grain‐size distribution of blown sand

Characterization of Wind‐Blown Sand With Near‐Wall Motions and Turbulence: From Grain‐Scale Distributions to Sediment Transport

Using soil minerals to investigate desert expansion in northern Shaanxi Province, China

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