SNOW FENCE | ScienceGate

Virtual modeling of mechanical structures, using computer performant software, is largely used in many fields. The paper presents some aspects regarding the loads on a snow fence mountig system, placed on a house roof with ceramic tiles. First, there are presented some general aspects of the snow fence types and mounting systems used. Then, there are Then there are presented the aspects about virtual modeling of these parts, using CATIA software. Also, there are presented some aspects about the Finite Element Analysis, respectively the results of this. In the paper final part, there are presented the conclusion.

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Permafrost Destabilization and Thermokarst Following Snow Fence Installation, Barrow, Alaska, U.S.A

Arctic Antarctic and Alpine Research ◽

10.1657/1523-0430(2006)38[530:pdatfs]2.0.co;2 ◽

2006 ◽

Vol 38 (4) ◽

pp. 530-539 ◽

Cited By ~ 45

Author(s):

Kenneth M. Hinkel ◽

John K. Hurd

Keyword(s):

Snow Fence

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A snow fence, A Swiss (snow) roll

Weather ◽

10.1002/j.1477-8696.1996.tb06181.x ◽

1996 ◽

Vol 51 (2) ◽

pp. i-i

Author(s):

L. Draper

Keyword(s):

Snow Fence

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The effect of wind direction on drift control by snow fences

Annals of Glaciology ◽

10.3189/172756401781819175 ◽

2001 ◽

Vol 32 ◽

pp. 159-162 ◽

Cited By ~ 6

Author(s):

Yukari Takeuchi ◽

Shun’ichi Kobayashi ◽

Takeshi Sato ◽

Kaoru Izumi ◽

Kenji Kosugi ◽

...

Keyword(s):

Wind Tunnel ◽

Wind Velocity ◽

Wind Direction ◽

The Other ◽

First Case ◽

Snow Fence ◽

Snow Fences ◽

Set Up ◽

Cold Wind ◽

Drift Control

AbstractSnowdrifting processes and the wind-velocity profiles around a collector and a blower snow fence were investigated in a cold wind tunnel. The purpose was to ascertain the effect of wind direction on drift control by snow fences. Three different cases were studied for both types of snow fence, and the resultant snowdrifts were compared. In the first case, the snow fence was perpendicular to the wind direction. In the second and third cases, it was tilted by 30° and 45°. When the collector snow fence was tilted, the amounts of snowdrift were much less than when the fence was perpendicular to the wind direction, because the area with low wind velocity was reduced to half behind the tilted fence. On the other hand, the blowing effect of the blower snow fence increased when it was set up at an angle to the wind direction. It is necessary to investigate the position where the blown snow is deposited by the tilted blower snow fence.

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Numerical simulation of drifting snow: erosion and deposition models

Annals of Glaciology ◽

10.1017/s0260305500014798 ◽

1998 ◽

Vol 26 ◽

pp. 191-196 ◽

Cited By ~ 36

Author(s):

Mohamed Naaim ◽

Florence Naaim-Bouvet ◽

Hugo Martinez

Keyword(s):

Mass Exchange ◽

Field Measurements ◽

Numerical Results ◽

Back Reaction ◽

Erosion And Deposition ◽

Deposition Model ◽

Drifting Snow ◽

Snow Fence ◽

Flow Turbulence ◽

Deposition Models

Earlier works on numerical modelling are analysed. Anderson and Haff (1991) proposed a model using the “splash” function which was defined for cohesionless sand. The Uematsu and others (1989, 1991) and Liston and others (1993,1994) approaches are based on fluid-mechanics conservation laws where the snow is transported and diffused by the air flow. These models consider the saltation layer as a boundary condition.For the flow, and for the suspension, we adopt the same model as that of Uematsu and Liston. For mass exchange between the flow and snow surface, we have developed an erosion–deposition model where mass exchange is defined in relation to flow turbulence, threshold-friction velocity and snow concentration. Our snow-erosion model was calibrated using Takeuchi's(1980) field measurements. The deposition model was tested by comparing numerical results with wind-tunnel ones, for sawdust-accumulation windward and leeward of a solid snow fence with a bottom gap. The numerical results obtained are close to the experimental results. The main results of the various sensitivity experiments are: the leeward accumulation is very sensitive to the ratio (u*/u*t) (it appears for (u*/u*t) close to 1 and disappears for (u*/u*t) > 1.2), the global accumulation produced by the fence increases as (u*/u*t) decreases and the back reaction of particles on turbulence extends slightly the windward accumulation.

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Field experiments on “living” snow fences

Annals of Glaciology ◽

10.3189/1998aog26-1-217-220 ◽

1998 ◽

Vol 26 ◽

pp. 217-220 ◽

Cited By ~ 1

Author(s):

Florence Naaim-Bouvet ◽

Pierre Mullenbach

Keyword(s):

Field Experiments ◽

Snow Accumulation ◽

Real Problem ◽

Effective Height ◽

Natural Plant ◽

Drifting Snow ◽

Snow Fence ◽

Limited Scale ◽

Living Fences ◽

Snow Fences

In Franee, drifting snow is generally controlled using artificial snow fences. Living snow fences are not a new concept but they have only been used on a limited scale. Research directly related to natural plant barriers is limited. We therefore decided to study the behaviour of species that would survive and grow satisfactorily in the French Alps.In the first experiment, we compared the storage capacity of several different kinds of living fences consisting of pruned spruces, unpruned spruces and sorbs.Field observations during the winter of 1995-96 proved that deciduous trees such as sorbs are effective, and that pruning the lower 50 cm is not effective at the end of the season because of the weight of snow on low branches.However, the use of natural plant barriers has disadvantages: a living snow fence takes time to reach an effective height and is difficult to establish on windy sites at a high altitude. This is a real problem. Therefore, in a second experiment, we studied the death rate of larches planted behind a fence. We noticed that the snow fence had several effects, snow accumulation (until the planted trees grew up) and protection of the planted trees.

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Investigating Safety Effectiveness of Wyoming Snow Fence Installations Along a Rural Mountainous Freeway

Transportation Research Record Journal of the Transportation Research Board ◽

10.3141/2613-02 ◽

2017 ◽

Vol 2613 (1) ◽

pp. 8-15 ◽

Cited By ~ 6

Author(s):

Thomas Peel ◽

Mohamed Ahmed ◽

Noriaki Ohara

Keyword(s):

Empirical Bayes ◽

Winter Season ◽

High Rate ◽

Control Surface ◽

Blowing Snow ◽

Snow Fence ◽

Adverse Weather ◽

Safety Effectiveness ◽

State And Local ◽

Snow Fences

Drifting and blowing snow is a problematic and dangerous aspect of Interstate travel in the state of Wyoming. The control of snow and the maintenance of roadways is an essential and significant task for many state and local agencies. Many significant factors—such as vehicle control, surface conditions, and visibility—can be affected by hazardous winter weather. In areas such as the inspected 19-mi section of Interstate 80, snow fences have become a common and practical method of mitigating the problems caused by large quantities of snow near or on the traveled way. Wyoming deals with a high rate of adverse weather–related crashes during the winter season. Naive before–after analyses of snow fence installations have historically indicated a slight decrease in such crashes. In this study, the safety effectiveness of snow fence installations was investigated; more rigorous quantitative-based approaches were used and included a before–after analysis with empirical Bayes—in which Wyoming-specific safety performance functions were used—and odds ratio analyses. Crash modification factors were estimated for various crash types and severity levels. The results from this study indicate that the installation of snow fences contributes to a significant increase in the safety effectiveness of Interstate use during the winter. Specifically, it was found that during adverse weather conditions, snow fences decreased total crashes and fatal and injury crashes by about 25% and 62%, respectively.

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Impacts of permafrost degradation on a road embankment at Umiujaq in Nunavik (Quebec), Canada

Canadian Geotechnical Journal ◽

10.1139/t10-101 ◽

2011 ◽

Vol 48 (5) ◽

pp. 720-740 ◽

Cited By ~ 65

Author(s):

Richard Fortier ◽

Anne-Marie LeBlanc ◽

Wenbing Yu

Keyword(s):

Numerical Modeling ◽

Permafrost Degradation ◽

Sand Layer ◽

Geophysical Investigation ◽

The Road ◽

Access Road ◽

Discontinuous Permafrost ◽

Snow Fence ◽

On The Road ◽

Ground Penetrating

Differential subsidence of as much as 0.85 m is affecting the access road to Umiujaq Airport in Nunavik (Quebec), Canada, located in the discontinuous permafrost zone. A geotechnical and geophysical investigation including piezocone test, ground-penetrating radar profiling, electrical resistivity tomography, and numerical modeling of the thermal regime of the road embankment and subgrade is presented to characterize the ground stratigraphy and permafrost conditions and to assess the exact causes and effects of permafrost degradation on the road embankment. The subsidence is due to thaw consolidation taking place in a layer of ice-rich silt underneath a superficial sand layer. While the seasonal freeze–thaw cycles were initially restricted to the sand layer, the thawing front has now reached the thaw-unstable ice-rich silt layer. According to our numerical modeling, the increase in air temperature recently observed in Nunavik cannot be the sole cause of the observed subsidence affecting this engineering structure. The thick embankment also acts as a snow fence favoring the accumulation of snow on the embankment shoulders. The permafrost degradation is also due to the thermal insulation of the snow cover reducing heat loss in the embankment shoulders and toes.

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