An experimentalist's overview of wind reduction systems in infrasound measurements

2021 ◽  
Vol 150 (4) ◽  
pp. A103-A103
Author(s):  
Jeremy Webster
Keyword(s):  
Wind Reduction

Effect of a Bottom Gap on the Flow Characteristics behind Non-Planar Porous Fence

2011 ◽  
Vol 356-360 ◽  
pp. 1391-1395 ◽  
Author(s):  
Zhen Ya Duan ◽  
Wen Xiang Yang ◽  
Tian Shun Wang ◽  
Jun Mei Zhang
Keyword(s):  
Turbulence Intensity ◽  
Flow Characteristics ◽  
Stream Velocity ◽  
Large Area ◽  
Mean Velocity ◽  
Gap Ratio ◽  
Shelter Effect ◽  
Wind Reduction ◽  
Porous Fence ◽  
Velocity Field Measurement

The flow field behind non-planar porous fence of geometric porosity ε=0.273 with various bottom gaps (G) has been investigated by hot-wire anemometer velocity field measurement technique in a wind tunnel experiment. Seven gap ratios G/H=0.000, 0.025, 0.075, 0.125, 0.150, 0.175, 0.200 of non-planar porous fence were tested in this study with the free-stream velocity fixed at 10m/s. The experimental data were analyzed and the turbulence intensity and wind reduction ratios for different gaps of the porous fence were calculated to estimate the shelter effect of a non-planar porous fence model. The results show that the gap ratio G/H=0.150 gives the best shelter effect among the seven gaps of the non-planar porous fence tested in this study, having a better mean velocity and turbulence intensity as well as wind reduction ratio in a large area behind the non-planar porous fence.

scholarly journals Wind reduction by aerosol particles

2006 ◽  
Vol 33 (24) ◽  
Author(s):  
Mark Z. Jacobson ◽  
Yoram J. Kaufman
Keyword(s):  
Aerosol Particles ◽  
Wind Reduction

Relationship between shelterbelt structure and mean wind reduction

2007 ◽  
Vol 145 (3-4) ◽  
pp. 186-194 ◽  
Author(s):  
Hiroyuki Torita ◽  
Hajime Satou
Keyword(s):  
Wind Reduction

Research on wind barrier of canyon bridge-tunnel junction based on wind characteristics

2020 ◽  
pp. 136943322097173
Author(s):  
Lu Wang ◽  
Xiaoxin Chen ◽  
Hong Chen
Keyword(s):  
Traffic Safety ◽  
Tunnel Junction ◽  
Traffic Accidents ◽  
Bridge Deck ◽  
Geographical Location ◽  
Simulation Method ◽  
Intensity Changes ◽  
Aerodynamic Performances ◽  
Wind Barrier ◽  
Wind Reduction

Due to the acceleration effect of the wind by the special geographical location of the canyon bridge-tunnel junction, the traffic safety and stability of this section are difficult to be guaranteed, resulting in frequent traffic accidents. In order to ensure the safety and comfort of vehicles driving on this section, the numerical simulation method based on CFD is adopted to establish the numerical model of the canyon bridge-tunnel junction. The acceleration of the incoming wind speed in the bridge-tunnel junction with a guardrail that is 0.8 m high is analyzed from different canyon spacings, wind directions and heights from the bridge deck. Based on the characteristics of wind field above the bridge deck, two kinds of gradient wind barriers—trapezoidal and stepped—are proposed, and their wind reduction effects and turbulence intensity changes are analyzed. Then the aerodynamic performances of running vehicle are compared. The results show that the stepped wind barrier with 50% porosity and rectangular section railings has the best wind reduction effects, and can noticeably improve the comfort of driving. The aerodynamic coefficients of vehicle are lower with stepped wind barrier.

scholarly journals Lack of bipolar see-saw in response to Southern Ocean wind reduction

2007 ◽  
Vol 34 (12) ◽  
Author(s):  
A. Levermann ◽  
J. Schewe ◽  
M. Montoya
Keyword(s):  
Southern Ocean ◽  
Ocean Wind ◽  
Wind Reduction

scholarly journals Wind reduction downwind from a savanna woodland edge

1994 ◽  
Vol 42 (2) ◽  
pp. 145-157
Author(s):  
R.M.R. Kainkwa ◽  
C.J. Stigter
Keyword(s):  
Simple Model ◽  
Tree Density ◽  
Tree Canopy ◽  
Prevailing Wind ◽  
Acacia Tortilis ◽  
Savanna Woodland ◽  
Wind Speeds ◽  
Average Wind ◽  
Wind Reduction ◽  
Made In

A study was made in 1987-89 of the wind protection provided by a sparse tree canopy in a savanna woodland (mainly Acacia tortilis) edge in N. Tanzania. Wind speeds were measured at two heights (1.0 and 2.5 m) along transects perpendicular to the prevailing wind; tree density ranged from 60 to 150 stems/ha. A simple model was formulated for average wind reduction within such canopies. Average wind speeds decreased with increasing distance from the woodland edge, until they become almost constant (saturation reduction). Airflow around single trees was studied for more understanding of these results. It is suggested that preservation or regeneration of trees should be encouraged for wind protection in planning and developing crop land.

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