Wind effects on snowdrift on stepped flat roofs

Tsuchiya, Manabu; Tomabechi, Tsukasa; Hongo, Takeshi; Ueda, Hiroshi

doi:10.1016/s0167-6105(02)00295-7

Cited by 71 publications

(26 citation statements)

References 9 publications

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“…And the snow distribution is dealt with digital image processing. The material is different from that of preference [1]- [8]. So the result is different from those lectures to some extent.…”

Section: Resultsmentioning

confidence: 89%

“…Lecture [8] point out that when the lower roof is on the windward side, a local sweeping wind flow occurred on the leeward side (x/H=0.1-0.5), resulting in a sudden decrease in snow depth. But in this paper, snow in Shanghai is too wet (humidity equals 88%) and the temperature is relatively high (-1℃).…”

Section: Resultsmentioning

confidence: 99%

“…Only minority researchers made wind tunnel experiment and field experiment to study the distribution law [5]~ [8] . To my knowledge, all lectures measure the depth of roof snow with rulers or something like that to gain snow distribution.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Close Shot Photogrammetry for Measuring Wind-Drifted Snow Distribution on Stepped Flat Roofs

Yan

Cheng

2008

2008 ISECS International Colloquium on Computing, Communication, Control, and Management

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A contactless inspection using a household digital camera (close shot photogrammetry) is introduced to improve measurement of wind-drifted snow distribution on the lower roof of a stepped flat roof model. Based on the image processing technique, a series of wind tunnel tests under different wind directions are investigated. Then 3-dimensional coordinates of the target points are calculated. Two typical directions are presented and discussed. The calculation results indicate that snow distribution on the lower roof appears to be concave when it is on the windward side. The maximum snow depth is located at the step, and the magnitude is about 2.78 order of the average snow depth. When the lower roof is on the leeward side, the distribution appears to be convex. The maximum depth located 1.0H away from the step, and the magnitude is about 1.2 order of average depth.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Close Shot Photogrammetry for Measuring Wind-Drifted Snow Distribution on Stepped Flat Roofs

Yan

Cheng

2008

2008 ISECS International Colloquium on Computing, Communication, Control, and Management

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“…As shown in the figure, the snow depth distributions at various intervals are insignificantly different, indicating that after the experiment time for 300s the particle distribution almost reached equilibrium, which corresponds to 11.25h for the prototype as per Anno's time scale. The figure also presents Tsuchiya's field observation results for similar model in Hokkaido of Japan [23] . It can be seen from the figure that the test results are basically consistent with the field observation.…”

Section: Test Resultsmentioning

confidence: 94%

Wind Tunnel Test of Snow Redistribution on Roofs

Liao¹,

Li²,

Huang³

2017

dtetr

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A series of wind tunnel tests were carried out to predict snow distribution on roofs. A typical stepped roof and two gable roofs were investigated. Model snow depth distributions on the roofs were measured at various time intervals. The effects of velocity and wind direction were studied, and mass transport rates on the roofs were examined as well. The results show that, the saltation of particles decreases the turbulence intensity nearby the surface, and the effective aerodynamic roughness-lengths of the field are proportional to the 2nd power of the friction velocities. At the wind direction of 0°, the snow depth distribution on the stepped roof is well consistent with the field observation. Snow depth distributions on the stepped roof are quite unbalanced under oblique winds, especially at wind direction of 135°, the snow depth coefficients range from 0 to 1.7. The leeward side of the gable roofs may accumulate more snow at wind direction of 0°. The maximum coefficients are 1.7 and 1.2 for slope 10° and 20° respectively. The mean mass flux rates on the roofs are proportional to velocities, implying that the mass transport rate increases with the 3rd power of the friction velocity.

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“…However, it's believed that as long as the geometry dimension of model is greater than the saltation length of particles, the result error would be not so significant [12]. The saltation length of particle is about 10 times of the saltation height, and the average saltation height of par-ticle is approximately 1.6u * 2 /(2 g) [8], then the dimension of the model should comply with the following 2 * 8 1 u gL  (15) which can be satisfied readily in a usual wind tunnel test.…”

Section: Reynolds Numbermentioning

confidence: 99%

Similarity Study on Snowdrift Wind Tunnel Test

Liao¹,

Li²,

Huang³

2013

OJCE

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The model for snowdrift wind tunnel test needs to be similar with the prototype. Based on detailed analysis in aspects of geometry, kinematics and dynamics, the major similarity parameters that need to be satisfied are gained. The contradiction between the Reynolds number and Froude number as well as the problem of time scale is introduced, and the selections of the model parameters are specified. Lastly, an example of snowdrift wind tunnel test by adoption of quartz sand as the model of snow grains is presented. The flow field and the snow distributions on a typical stepped roof were investigated. The results show that the flow filed characters are in good agreement with the field observations, and the stepped roof snow depth distributions are basically consistent with the observation results.

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Wind effects on snowdrift on stepped flat roofs

Cited by 71 publications

References 9 publications

Close Shot Photogrammetry for Measuring Wind-Drifted Snow Distribution on Stepped Flat Roofs

Close Shot Photogrammetry for Measuring Wind-Drifted Snow Distribution on Stepped Flat Roofs

Wind Tunnel Test of Snow Redistribution on Roofs

Similarity Study on Snowdrift Wind Tunnel Test

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