Modelling the Retreat of a Coastal Dune under Changing Winds

Gabarrou, Sylvain; Cozannet, Gonéri Le; Parteli, Eric J. R.; Pedreros, Rodrigo; Guerber, Etienne; Millescamps, Bastien; Mallet, Cyril; Oliveros, Carlos

doi:10.2112/si85-034.1

Cited by 9 publications

(6 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The range of θ in Fig. 3 corresponds to 0.18 ≤ u * /(m s −1 ) ≤ 0.4, thus including values of u * characteristic of Aeolian dune areas [11]. We see from Fig.…”

Section: Model Validationmentioning

confidence: 85%

Toward a large-scale particle-based parallel simulator of Aeolian sand transport, including a model for mobile sand availability

Kamath

Parteli

2021

EPJ Web Conf.

View full text Add to dashboard Cite

We develop a numerical tool for particle-based simulations of Aeolian sand transport. Our model combines a Discrete-Element-Method for the sand particles with an efficient hydrodynamic description of the average turbulent horizontal wind velocity field over the granular bed, which has been developed in previous work and accounts for the two-way coupling of the granular and fluid phases. However, here we implement our model within the open source library LAMMPS for granular massively parallel simulations and incorporate a new grid coarsening scheme for the wind model. We show that our model quantitatively reproduces observed values of the steady-state (saturated) sand flux under various flow conditions. Furthermore, we model different conditions of mobile sand availability and find a strong dependence of the sand flux on this availability.

show abstract

“…The range of θ in Fig. 3 corresponds to 0.18 ≤ u * /(m s −1 ) ≤ 0.4, thus including values of u * characteristic of Aeolian dune areas [11]. We see from Fig.…”

Section: Model Validationmentioning

confidence: 85%

Toward a large-scale particle-based parallel simulator of Aeolian sand transport, including a model for mobile sand availability

Kamath

Parteli

2021

EPJ Web Conf.

View full text Add to dashboard Cite

show abstract

“…Wind is not only an important factor affecting the geomorphological evolution in sandy areas [ 35 , 36 , 37 ] but also the source power causing sand damage [ 38 , 39 , 40 ]. According to the classification standard of wind energy (Fryberger and Dean, 1979), the sand DP of the Shannan wide valley of the Sichuan–Tibet Railway indicates a low-wind-energy environment (≤200 VU), and the RDP/DP belongs to an intermediate ratio (0.3–0.8) and a closed to low ratio (≤0.3).…”

Section: Discussionmentioning

confidence: 99%

“…From a time point view, the critical period for the prevention and control of wind-blown sand hazards in the railway is the spring. Wind is not only an important factor affecting the geomorphological evolution in sandy areas [35][36][37] but also the source power causing sand damage [38][39][40]. According to the classification standard of wind energy (Fryberger and Dean, 1979), the sand DP o the Shannan wide valley of the Sichuan-Tibet Railway indicates a low-wind-energy Wind is not only an important factor affecting the geomorphological evolution in sandy areas [35][36][37] but also the source power causing sand damage [38][39][40].…”

Section: Discussionmentioning

confidence: 99%

“…Wind is not only an important factor affecting the geomorphological evolution in sandy areas [35][36][37] but also the source power causing sand damage [38][39][40]. According to the classification standard of wind energy (Fryberger and Dean, 1979), the sand DP o the Shannan wide valley of the Sichuan-Tibet Railway indicates a low-wind-energy Wind is not only an important factor affecting the geomorphological evolution in sandy areas [35][36][37] but also the source power causing sand damage [38][39][40]. According to the classification standard of wind energy (Fryberger and Dean, 1979), the sand DP of the Shannan wide valley of the Sichuan-Tibet Railway indicates a low-wind-energy environment (≤200 VU), and the RDP/DP belongs to an intermediate ratio (0.3-0.8) and a closed to low ratio (≤0.3).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Wind Dynamic Characteristics and Wind Tunnel Simulation of Subgrade Sand Hazard in the Shannan Wide Valley of the Sichuan–Tibet Railway

Xie

Zhang

Pang

2022

IJERPH

View full text Add to dashboard Cite

The Shannan wide valley section of the Sichuan–Tibet Railway is located in the middle reaches of the Yarlung Zangbo River, where sand hazard is severe. A wind tunnel simulation experiment was conducted by establishing a subgrade model and performing field observation to carry out research on the dynamic environment of blown sand and the sand hazard formation mechanism of subgrade in the Shannan wide valley. Observation results showed that the sand-moving wind of the Shannan wide valley was chiefly derived from the ENE direction, and the resultant sand transport direction was WSW. Wind speed, the frequency of sand-moving wind, the sand drift potential, and the maximum possible sand transport quantity were relatively high in the spring. Meanwhile, the dynamic of the wind-blown sand flow was further enhanced in the spring, particularly influenced by the flow action of the Yarlung Zangbo River. Thus, sand hazard mainly occurred in the spring. The Sichuan–Tibet Railway subgrade evidently changed the wind speed, the wind-blown sand flow field, and conditions of transport and accumulation. Within the distance of 5 times the model height in the windward direction and at the subgrade top center to 20 times the model height of the leeward direction was the wind speed deceleration zone, resulting in sand particle sediments. A wind speed acceleration zone appeared on the subgrade windward slope shoulder, resulting in wind-blown sand flow erosion. This study provides a scientific basis for sand hazard prevention and control in the Sichuan–Tibet Railway.

show abstract

“…As one of the key measures for control desertification in arid and semiarid regions, all of these quantitative findings suggest that the application of the simulated shrubs will be an important component of efforts to further extend ecological engineering projects in arid and semiarid desert regions. [49][50][51] It would be interesting to incorporate the shelter device proposed in the present work into landscape models for aeolian soil transport and dune migration, with the aim of optimizing the parameters associated with the windbreak characteristics for aeolian soil stabilization at the field scale.…”

Section: Discussionmentioning

confidence: 99%

Variation in grain-size characteristics of simulated shrubs as a novel sand-barrier in a wind tunnel experiment

Wang

Pan

Yuan³

et al. 2021

Science Progress

View full text Add to dashboard Cite

Sand transport is the main manifestation of sand damage in the arid and semiarid regions globally. It is a huge challenge to stabilize mobile sandy and change them into stable productive ecosystems. The establishment of simulated shrubs is one of the most effective measures to solve the above difficulties as a novel sand-barrier. To clarify simulated shrubs’ role in the process of ecological restoration. It will be greatly helpful to incorporate the shelter device proposed in the present work into landscape models for aeolian soil transport, to optimize the parameters associated with the sand-barrier characteristics for aeolian soil stabilization at the field scale. A series of wind tunnel experiments were conducted to analyze the variations of soil grain-size of simulated shrubs with different spatial configurations, row spaces, and net wind speeds. Further, the soil grain-size parameters were calculated by the classic method proposed by Folk and Ward to clarify the change of soil particles resulted from the blocking effects. The average grain-size content of simulated shrubs with different spatial configurations, row spaces, and net wind speeds was dominated by medium sand and fine sand, and the total percentage was more than 90%. Moreover, the sand deposition of simulated shrubs with different spatial configurations increased with the improvement of wind speeds. The average sand deposition of spindle-shaped simulated shrubs in 17.5 × 17.5 cm and broom-shaped simulated shrubs in 17.5 × 26.25 cm under different net wind speeds was the least. The effects of row spaces on average grain-size parameters increased with the improvement of net wind speeds. By calculating the correct characteristics of specific shelter devices proposed in the present work, all of these findings suggest that the application of simulated shrubs will be an important component to further extend ecological engineering projects in arid and semiarid regions.

show abstract

Modelling the Retreat of a Coastal Dune under Changing Winds

Cited by 9 publications

References 19 publications

Toward a large-scale particle-based parallel simulator of Aeolian sand transport, including a model for mobile sand availability

Toward a large-scale particle-based parallel simulator of Aeolian sand transport, including a model for mobile sand availability

Wind Dynamic Characteristics and Wind Tunnel Simulation of Subgrade Sand Hazard in the Shannan Wide Valley of the Sichuan–Tibet Railway

Variation in grain-size characteristics of simulated shrubs as a novel sand-barrier in a wind tunnel experiment

Contact Info

Product

Resources

About