A review of recent progress in our understanding of aeolian sediment transport

Anderson, Robert S.; Sørensen, Michael; Willetts, B. B.

doi:10.1007/978-3-7091-6706-9_1

Cited by 155 publications

(118 citation statements)

References 37 publications

Supporting

Mentioning

115

Contrasting

Unclassified

Order By: Relevance

“…The decreasing contribution of creep to total aeolian transport with increasing wind velocity is consistent with the majority of previous results [Chepil, 1959;Horikawa, 1960;Anderson et al, 1991;Dong et al, 2002;Wu, 2003;Wang and Zheng, 2004]. However, the mean contribution is higher than the figure of 25% suggested by Bagnold [1941].…”

supporting

confidence: 92%

“…[34] Several previous studies have observed the influence of particle size on the contribution of creep to aeolian transport [Horikawa, 1960;Anderson et al, 1991;Dong et al, 2002], as the proportion of mass transported by creep decreased with increasing particle size. In future research, we intend to study the effect of particle size in more detail by performing multiple wind tunnel experiments using several uniform particle diameters and a variety of grain size distributions.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Transport mass of creeping sand grains and their movement velocities

et al. 2013

View full text Add to dashboard Cite

[1] Aeolian sand transport is an important component of material circulation above terrestrial surfaces and can include processes of creep, saltation, and suspension. The complex movement of material and energy during aeolian transport has meant that these processes have previously been examined in isolation. Although a significant amount of research has been conducted on aeolian sand transport, this focused primarily on saltation. As a result, there are few data available on sand grain creep, primarily due to a lack of theoretical models and the difficulty of direct measurements. In this study, we present novel methods and instrumentations to accurately measure the transport mass and the velocity of creeping sand grains. Using data collected with above instrumentations and a ladder sampler at four friction velocities (u * = 0.26, 0.35, 0.47, and 0.56 m s À1 ) in a wind tunnel, we studied the transport mass of creeping sand grains and their movement velocities, as well as other key parameters of aeolian sand transport. Four major conclusions can be drawn from this study: (1) The transport mass (q 0 ) of creeping sand grains increases with increasing frictional wind velocity (u * ). The relationship between these variables is represented by the power function q 0 = À0.053 + 9.195u * 2.800 . (2) The contribution of creep to total aeolian sand transport decreases with increasing frictional wind velocity. Creep contributed 57% of total aeolian transport at the lowest frictional wind velocity but only 19% at the highest velocity. (3) The threshold frictional wind velocity for entrainment was 0.158 m s À1. (4) The movement velocity of creeping sand grains ranged from 0 to 0.14 m s À1, but more than 70% of recorded velocities were less than 0.02 m s À1. Although the results of this study require further validation, they provide a strong basis for future research and help deepen our understanding of aeolian sand transport.

show abstract

supporting

confidence: 92%

mentioning

confidence: 99%

Transport mass of creeping sand grains and their movement velocities

et al. 2013

View full text Add to dashboard Cite

show abstract

“…From beach to foredunes several transport modes can be distinguished, based on the trajectories of moving grains. Anderson et al (1991) give an overview of transport mechanisms. On the beach, grains mainly move in saltation, reptation and creep.…”

Section: Grain-size Changes and Transport Mechanismsmentioning

confidence: 99%

Changes in grain size of sand in transport over a foredune

Arens

Boxel

Abuodha

2002

Earth Surf Processes Landf

View full text Add to dashboard Cite

Suspended sand is sampled at several heights and positions on a beach and foredune, providing detailed insight into the vertical and horizontal variation in sand content in the air during landward transport. Grain-size analysis is used to study the changes in grain-size distribution during landward transport. Mean grain size and sorting decrease during transport. Changes in textural parameters follow a gradual and regular path when the sediment is transported into the foredune. Sediment trapped on the seaward slope at a height of 30-50 cm above the surface closely resembles the sediment trapped landward, which implies that changes in the direction of transport are related to vertical changes within the sediment transport profiles. The movement of sand over the vegetated foredunes is induced by turbulent forces created by the air flowing across the vegetation and the foredune, leading to a change from saltation on the beach to modified saltation and suspension on the foredune. Small grains are lifted higher and fall more slowly than coarse grains and therefore are transported further landward, resulting in a gradual decrease in grain size of the landward-deposited sediment.

show abstract

“…His perception of the process, although refinements and modifications have been developed in recent years (see [5] for a review of recent progress), still holds in the main lines.…”

Section: Outlines Of Aeolian Sand Transportmentioning

confidence: 99%

Dynamics of aeolian sand ripples

Csahók

Misbah

Rioual

et al. 2000

The European Physical Journal E

View full text Add to dashboard Cite

We analyze theoretically the dynamics of aeolian sand ripples. In order to put the study in the context we first review existing models. This paper is a continuation of two previous papers [3,4], the first one is based on symmetries and the second on a hydrodynamical model. We show how the hydrodynamical model may be modified to recover the missing terms that are dictated by symmetries. The symmetry and conservation arguments are powerful in that the form of the equation is model-independent. We then present an extensive numerical and analytical analysis of the generic sand ripple equation. We find that at the initial stage the wavelength of the ripple is that corresponding to the linearly most dangerous mode. At later stages the profile undergoes a coarsening process leading to a significant increase of the wavelength. We find that including the next higher order nonlinear term in the equation, leads naturally to a saturation of the local slope. We analyze both analytically and numerically the coarsening stage, in terms of a dynamical exponent for the mean wavelength increase. We discuss some future lines of investigations.

show abstract

A review of recent progress in our understanding of aeolian sediment transport

Cited by 155 publications

References 37 publications

Transport mass of creeping sand grains and their movement velocities

Transport mass of creeping sand grains and their movement velocities

Changes in grain size of sand in transport over a foredune

Dynamics of aeolian sand ripples

Contact Info

Product

Resources

About