Wss Powerpoint Wind And Dust Jan 2012 Show

Since 1986
www.WeatherSolve.com

About WeatherSolve Structures
Windbreak research
Examples of windbreaks
Windbreak components
Extreme wind considerations


At WeatherSolve we have been researching, developing,
designing, and building wind fences for over 30 years.

WSS has miles of fences in North and South America, in the
Middle East, Asia and the South Pacific. Over 10km of those
fences are close to 100ft high.

We know of no other companies with wind fences still standing
that are over 60ft high. In fact no other company worldwide has
even a small fraction of this experience – in length, in height or in
variety of locations.

 Engineering based near Vancouver, Canada.
supply arm based in Georgia USA
 We fit our input to your needs:-
Design – Aerodynamic and structural design capabilities
Supply – from specialized components only to turnkey supply
Install – from supervision and training only to complete install
Maintain – Inspection service or -
complete maintenance contract


Dustbowl Storm (1930’s)
Early wind fence research
focused on controlling wind
erosion Contractors discussing kiwifruit
shelter erection techniques, NZ


There have been many studies of wind fence effectiveness.
Effectiveness relates to aerodynamic porosity of the
cladding and height of the fence.
Windspeed reduction is also a function of the distance from
the fence and several other more subtle variables such as
turbulence of the incoming wind.


Shelter Effect

Illustrated are the
mean windspeed
reductions, behind
model windbreaks in a
wind tunnel, as a
fraction of windspeed
without the barriers.

Raine and Stevenson, 1977

Dust erosion from a pile


Upwind windbreak

 Erosion ∝ (wind speed) 3
 Overall dust loss is typically proportional to (windspeed) 2

 A good windbreak will reduce wind speeds to under 40%
 so dust loss is reduced to under 0.4 x0.4 = 16%


Downwind windbreak

 Dust trapped in front of windbreak

 Most of rest falls out close to windbreak


For exploring non-standard
situations, WeatherSolve is pleased to be
able to work with the Midwest Research
Institute.

Founded in 1944.
Based in Kansas City, USA
Independent not-for-profit institute
An internationally recognised problem solver
for Government and Industry
Specialists in wind pattern research
and modelling

Canopy windbreak, NZ


Inside canopy, winds outside appx 10 mph


Grid windbreak system
on Carembolas in South Florida


Plywood plant, BC
Dual fabric layers >> upwind fabric

Wind protection for iron slag
tipping area. 45ft high. NJ


Portable
windbreak
for gravel
crusher.

20ft high.
Towable or
truckable.


Causeway
windbreak
for coal pile.
Northern BC

40ft high on 30ft
causeway
.


Sulphur Stockpile
Aruba 40ft high.
Note overhanging top
to curl wind along
face of windbreak


Combined windbreak, security fence
and visual barrier - OR


Truck dump safety and
dust control - OK

Cooling tower wind
control for increased
efficiency -NV


Several fences – over
9km total length
Between 15m and
30m high

Windfence 2.5 km in
length, 20m high


www.WeatherSolve.com Windfence 28m high
x 3.3 km in length

Windfence 7m high x
www.WeatherSolve.com 120m in length

Windbreak Components


Many specialized
components.

A testing program for
new components for
strength and fatigue life


Pole spacings typically 15m to
30m. (Usually longer spacings
for longer runs and higher
poles)

Typical Heights (left to right)
10m to 20m small tripod
15m to 30m large tripod
15m to 30m 3 leg truss
2m to 15m cantilever pole

Note: all structures custom designed

Extreme Wind
Considerations


The stress-rated Ultraclip
The following 3 pages show how it
works to protect the structure in
extreme storms.
Note- the stress release
mechanism can be set to any level
chosen by the client and the
design engineers.


NORMAL OPERATION
All clips in place
Shock loads from wind gusts absorbed by
Fabric, cable , and plastic deformation of clips.


UP TO 30% OVERLOAD
Upper clips in place
Lower nylon clips have released allowing lower hem
Cable to billow out and spill about 30% of the load.


OVER 30% OVERLOAD (or hem cable fatigue)
Upper clips in place
Lower hem cable has broken and fabric has pulled out of
lockstrip mounted on poles.
Some ripping may occur requiring a replacement panel


Stress-rated clip

After hurricane Charlie with lower clips
released and poles / cables intact.


Productive environments
for all weathers
Custom designed to match your needs.
Hurricane and cyclone tested
Bola(1988), Andrew(1992) Charley, Frances, Jeanne (2004)
30 yr worldwide design experience.
Patented features.
Effectiveness analyses available.


Wss Powerpoint Wind And Dust Jan 2012 Show

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