CWE study of wind flow around railways: Effects of embankment and track system on sand sedimentation

Horvat, Marko; Bruno, Luca; Khris, Sami

doi:10.1016/j.jweia.2020.104476

Cited by 29 publications

(11 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When wind-blown sand flow runs near the railway, the subgrade will change its structural form and energy distribution [ 41 ]. Meanwhile, the subgrade will also affect the transport, accumulation, and erosion process of wind-blown sand flow near the surface [ 42 ]. In general, the influence increases with the increase in the subgrade volume.…”

Section: Discussionmentioning

confidence: 99%

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

Section: Discussionmentioning

confidence: 99%

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

show abstract

“…The entire governing equation expressed in Einstein symbols and Cartesian coordinates is as follow (Menter et al, 2003;Bruno et al, 2018c;Horvat et al, 2021):…”

Section: Mathematical Modelsmentioning

confidence: 99%

“…3). We set the size LY=10.0 H according to the method of Horvat et al (2021). The distances of the entire computational domain were 20.0 H and 40.0 H from the sand fences in the windward and leeward directions, respectively, which were sufficiently large (>15.0 H) to avoid influences of boundary conditions on the results.…”

Section: Mathematical Modelsmentioning

confidence: 99%

“…The average windproof efficiencies of the first-row and the second-row sand fences differed by 10% and 10.4% from the numerical simulation results, respectively. In the numerical simulation process, referring to the work of Horvat et al (2021), the ground shear force (τ t) is proportional to the sand particle size, so the value of τt is 0.045 Pa. τ is defined as the surface shear stress by wind flow. When τ/τt is smaller than -1, it represents backward erosion; when it is in the range of [-1, 1], it represents sedimentation; and when it is larger than 1, it represents positive erosion (abbreviated as erosion).…”

Section: Comparison Between the Numerical Simulation And Field Observ...mentioning

confidence: 99%

“…Researcher divided sand-control measures into solidification, resistance, dredging, and diversion categories according to their functions and properties (Bruno and Fransos, 2015;Li and Sherman, 2015;Horvat et al, 2021). Among these, sand-resistant engineering measures primarily include high vertical sand barriers, sand fences, and forest belts (Hewes, 1981;Vercauteren et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sheltering effect of punched steel plate sand fences for controlling blown sand hazards along the Golmud-Korla Railway: Field observation and numerical simulation studies

Zhang

Tian

et al. 2022

J. Arid Land

View full text Add to dashboard Cite

Sand fences made of punched steel plate (PSP) have recently been applied to control wind-blown sand in desertified and Gobi areas due to their strong wind resistance and convenient in situ construction. However, few studies have assessed the protective effect of PSP sand fences, especially through field observations. This study analyzes the effects of double-row PSP sand fences on wind and sand resistance using field observations and a computational fluid dynamics (CFD) numerical simulation. The results of field observations showed that the average windproof efficiencies of the first-row and second-row sand fences were 79.8% and 70.8%, respectively. Moreover, the average windproof efficiencies of the numerical simulation behind the first-row and second-row sand fences were 89.8% and 81.1%, respectively. The sand-resistance efficiency of the double-row PSP sand fences was 65.4%. Sand deposition occurred close to the first-row sand fence; however, there was relatively little sand on the leeward side of the second-row sand fence. The length of sand accumulation near PSP sand fences obtained by numerical simulation was basically consistent with that through field observations, indicating that field observations combined with numerical simulation can provide insight into the complex wind-blown sand field over PSP sand fences. This study indicates that the protection efficiency of the double-row PSP sand fences is sufficient for effective control of sand hazards associated with extremely strong wind in the Gobi areas. The output of this work is expected to improve the future application of PSP sand fences.

show abstract

Erosion and Deposition Patterns Over a Wind‐Blown Sand Dune Behind a High Vertical‐Type Sand Fence

Dong,

Cheng,

et al. 2024

Land Degrad Dev

View full text Add to dashboard Cite

Sand dunes are the primary factor influencing wind‐sand disasters. To explore the evolution law of wind‐blown sand dunes surrounding high vertical‐type sand fences along desert railways, numerical simulation analyses based on computational fluid dynamics coupled with a discreet element method of the wind‐sand flow field and sand particles trajectories around sand fences were conducted. The focus of this study was the Yandun section of the Lanzhou‐Xinjiang Railway in Xinjiang, China (42.38°N, 93.95°E). By combining ERA5 wind data with field measurements and monitoring, a three‐dimensional coupling model was established. According to the results of L9 (33) orthogonal tests, the sensitivity of the three factors to the evolution of sand dunes can be ordered as wind speed > porosity > height, indicating that wind speed is closely related to sand dune evolution (p < 0.05). The results of single‐factor tests indicate that the structure of wind‐sand flow fields, sand accumulation patterns, and sand particle movement trajectories vary significantly under different wind speeds. The sand accumulation rates on the windward slope of the sand dune are 29.67%, 25.91%, and 20.04%, while on the leeward slope, these rates are 40.33%, 34.09%, and 29.96%, respectively. The obtained information on the evolution law of sand dunes surrounding high vertical‐type sand fences provides a scientific basis for wind‐sand prevention measures along railways in desert regions.

show abstract

CWE study of wind flow around railways: Effects of embankment and track system on sand sedimentation

Cited by 29 publications

References 49 publications

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

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

Sheltering effect of punched steel plate sand fences for controlling blown sand hazards along the Golmud-Korla Railway: Field observation and numerical simulation studies

Erosion and Deposition Patterns Over a Wind‐Blown Sand Dune Behind a High Vertical‐Type Sand Fence

Contact Info

Product

Resources

About