Numerical simulation of saltating particles in atmospheric boundary layer over flat bed and sand ripples

Tong, Ding; Huang, Ning

doi:10.1029/2011jd017424

Cited by 30 publications

(22 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The friction velocities corresponding to the four velocities [3]and [8] shows that the results of simulation are in compliance with those of experimental studies. The sand-coupled wind velocities profiles for different values of the inlet velocity are shown in Figure 4.…”

Section: Rusults and Discussionsupporting

confidence: 70%

“…Figure 5 show the comparison between the inlet wind profile and the sand-coupled wind profile. It can be seen that the velocity profile near to the surface is modified by saltating particles the effective height of influence increases with rising inlet wind velocity because more energy is transferred to sand grains from the air and the grains can jump higher [8]. In the recent work of [12] discussed the particle velocity profile and found that it is insensitive to the wind shear stress and it was expressed as a function of the height and grain diameter.…”

Section: Rusults and Discussionmentioning

confidence: 99%

“…The simulation calculation results are compared with the experimental results of [8] for the validation of the presented model. For this purpose, the calculated values of velocities and sand fluxes are taken at 8.5m from the test section entrance.…”

Section: Rusults and Discussionmentioning

confidence: 99%

“…For this purpose, the calculated values of velocities and sand fluxes are taken at 8.5m from the test section entrance. Figure 1 shows the wind velocity profiles at the test section entrance calculated by Eq(5) compared to the velocity measured by [8].…”

Section: Rusults and Discussionmentioning

confidence: 99%

“…In order to explore the fundamental internal mechanism in aeolian sand transport, numerical and analytical studies have been carried out generally subdivided into several different sub-processes [8]- [10]. They attempt to understand and quantifying the horizontal mass flux of saltating particles following wind intensity, with soil particles size and ground characteristics [11].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Physical Approach for Sand Flux Quantification and Flow Dynamic Properties Investigation for Fine Sand Grains Transport

Benarab¹,

Medjelled²,

Benchatti³

2016

IJHT

View full text Add to dashboard Cite

The purpose of this work is to study sand grains transport for the saltation mode. A numerical simulation approach is adopted with the introduction of a density distribution function. That aims to quantify the transported sand grains, according to the continuum theory. Making a prediction model for transported quantities. In this study, a fine sand grain size is taken into consideration as d=0. 295mm. The inlet wind velocities vary between 8 &18 m/s. The simulation results of sand flux are validated using previous experimental results. The mean horizontal velocity profiles are shown and discussed. It is noted that the sand flux can be described as a Gaussian function which is in good agreement with the experimental results in tunnels for the fine sand groups. This results lead to deduce the lift-off velocity and incident angles profiles distribution. From the sand-coupled wind velocity profile; it can be found that the wind velocity profile near to the surface is modified from logarithmic to a linear function. The variation of the turbulent kinetic energy with increasing wind velocity is further discussed. Finally the energy dissipation is shown. This model will find application in studies of saltation mode on both Earth and Mars.

show abstract

Section: Rusults and Discussionsupporting

confidence: 70%

Section: Rusults and Discussionmentioning

confidence: 99%

Section: Rusults and Discussionmentioning

confidence: 99%

Section: Rusults and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Physical Approach for Sand Flux Quantification and Flow Dynamic Properties Investigation for Fine Sand Grains Transport

Benarab¹,

Medjelled²,

Benchatti³

2016

IJHT

View full text Add to dashboard Cite

show abstract

Snow particle speeds in drifting snow

et al. 2014

View full text Add to dashboard Cite

Knowledge of snow particle speeds is necessary for deepening our understanding of the internal structures of drifting snow. In this study, we utilized a snow particle counter (SPC) developed to observe snow particle size distributions and snow mass flux. Using high-frequency signals from the SPC transducer, we obtained the sizes of individual particles and their durations in the sampling area. Measurements were first conducted in the field, with more precise measurements being obtained in a boundary layer established in a cold wind tunnel. The obtained results were compared with the results of a numerical analysis. Data on snow particle speeds, vertical velocity profiles, and their dependence on wind speed obtained in the field and in the wind tunnel experiments were in good agreement: both snow particle speed and wind speed increased with height, and the former was always 1 to 2 m s À1 less than the latter below a height of 1 m. Thus, we succeeded in obtaining snow particle speeds in drifting snow, as well as revealing the dependence of particle speed on both grain size and wind speed. The results were verified by similar trends observed using random flight simulations. However, the difference between the particle speed and the wind speed in the simulations was much greater than that observed under real conditions. Snow transport by wind is an aeolian process. Thus, the findings presented here should be also applicable to other geophysical processes relating to the aeolian transport of particles, such as blown sand and soil.

show abstract

Wind Erosion

Knight

2019

Aeolian Geomorphology

View full text Add to dashboard Cite

Numerical simulation of saltating particles in atmospheric boundary layer over flat bed and sand ripples

Cited by 30 publications

References 62 publications

Physical Approach for Sand Flux Quantification and Flow Dynamic Properties Investigation for Fine Sand Grains Transport

Physical Approach for Sand Flux Quantification and Flow Dynamic Properties Investigation for Fine Sand Grains Transport

Snow particle speeds in drifting snow

Wind Erosion

Contact Info

Product

Resources

About