A multiphase first order model for non-equilibrium sand erosion, transport and sedimentation

Preziosi, Luigi; Fransos, Davide; Bruno, Luca

doi:10.1016/j.aml.2015.01.011

Cited by 13 publications

(6 citation statements)

References 30 publications

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“…Such uniformity is not a natural characteristic of saltation, but instead an often necessary artifact of experimental design and averaging procedures. Recently, this realization has stimulated a growing body of research focused on the characteristics and causes of short‐term fluctuations, or unsteadiness, in aeolian saltation (see Barchyn and others ; Wang and Zheng ; Pähtz and others ; Preziosi and others ; Valance and others ).…”

mentioning

confidence: 99%

Intermittent Aeolian Saltation: A Protocol For Quantification

Sherman

Ellis

et al. 2018

Geographical Review

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The quantification of saltation intermittency-the proportion of time when sand transport occurs-provides valuable information about the nature of aeolian systems, including insights concerning threshold conditions for sand transport. Intermittency has been measured in numerous studies, but a lack of measurement standardization often makes the comparison of results difficult. Four methodological factors influence estimates of intermittency: sample frequency, sample duration, sample area, and sensor elevation. For a given transport rate, the value of intermittency may decrease with sensor elevation, increased sample frequency, or decreased sensor area; it may increase or decrease as a consequence of sample duration. We therefore simulate the influences of these factors and suggest a common protocol for measuring and reporting intermittency based on measurements at 1 Hz with 100 mm 2 sensor area at 50 mm elevation above the surface, or equivalent values.

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confidence: 99%

Intermittent Aeolian Saltation: A Protocol For Quantification

Sherman

Ellis

et al. 2018

Geographical Review

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“…of sand from the upwind to the downwind side of the dune. Referring to Preziosi et al [1] for more details on how the fluid dynamic coupling could be performed, in Figure 11, we show an example of how a transverse dune with a slightly supercritical slip face would evolve to reach a stable configuration.…”

Section: Discussionmentioning

confidence: 99%

“…Our interest in understanding and simulating the dynamics of sand slides is part of a wider effort consisting in deducing a complete model that also includes sand erosion, transport, and sedimentation [1]. In such a model, sand deposition and avalanches together with sand erosion contribute to determining the free boundary between the sand bed and the multiphase flow composed of sand grains transported by the wind, which includes the saltation layer in the region closer to the sand bed.…”

Section: Introductionmentioning

confidence: 99%

Modeling sand slides by a mechanics-based degenerate parabolic equation

Giudice

Giammanco

Fransos³

et al. 2018

Mathematics and Mechanics of Solids

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Avalanching plays a crucial role in granular materials dynamics, in particular in the evolution of the shape of the leeward side of sand dunes. This paper presents a physically-based mathematical model capable of reproducing the kinematic evolution of the surface of sand piles and to obtain eventually the stationary configurations, in the presence of external sources as well. Simulation results with different boundary conditions and geometries are reported in order to show the high flexibility of the model. The model is also validated by means of comparison with the experimental results of different authors.

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“…(6), the general TRL scale is summarized and referred to the S4S development process. In the first part (TRL1-3), the S4S technology concept is investigated by means of basic research on windblown sand phenomena [37] and engineering constraints to be fulfilled. S4S barrier is patented [33].…”

Section: Shield For Sand: Working Principles and Technology Developmentmentioning

confidence: 99%

“…We are planning aerodynamic shape optimization by means of rigorous computational-based optimization algorithms. The computational simulations will be based on the multiphase wind+sand model we are currently developing [37]. A further optimization is needed to minimize costs and duration of the barrier construction and its maintenance.…”

Section: Current and Future Developmentsmentioning

confidence: 99%

Shield for Sand: An Innovative Barrier for Windblown Sand Mitigation

Bruno

Coste²,

Fransos³

et al. 2018

ENG

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Background: Windblown sand mitigation for civil structures in arid environment is crucial. Indeed, the number of railways crossing deserts and arid lands is increasing. A number of sand mitigation measures already exist. Among them, sand barriers are particularly intended for line-like infrastructures. We reviewed patented sand barriers on the basis of their shape and porosity. Objective: A new solid barrier for windblown sand mitigation called Shield for Sand is presented. Shield for Sand has been designed with the aim of maximizing the sand trapping efficiency through an upper windward deflector and simplifying its maintenance by complaining to sand removal machines. The development of Shield for Sand follows the path traced by the Technology Readiness Level scale. Methods: The preliminary design of Shield for Sand has been supported by computational simulations of the wind flow around the barrier. Then, Shield for Sand has been tested in a wind tunnel with drifting sand in order to assess its efficiency. Both computational and experimental approaches allow an increase of the Technology Readiness Level. Results: The reversed flow induced by Shield for Sand increases its sand accumulation potential with respect to similar existing sand mitigation measures, such as the straight vertical wall. The efficiency of Shield for Sand resulting from the wind tunnel test is very high and almost constant with increasing sand accumulation level. Conclusion: The Shield for Sand working principles and performances are confirmed excellent. Final fullscale in-situ experiments are necessary to test the barrier under real environmental operational conditions.

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A multiphase first order model for non-equilibrium sand erosion, transport and sedimentation

Cited by 13 publications

References 30 publications

Intermittent Aeolian Saltation: A Protocol For Quantification

Intermittent Aeolian Saltation: A Protocol For Quantification

Modeling sand slides by a mechanics-based degenerate parabolic equation

Shield for Sand: An Innovative Barrier for Windblown Sand Mitigation

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