Greater London - met.reading.ac.ukbl_met/actual/non_protect... · Wind speed profile models •...

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© University of Reading 2008 www.reading.ac.uk 04 October 2012 Vertical wind profiles over Greater London Daniel Drew [email protected]

Transcript of Greater London - met.reading.ac.ukbl_met/actual/non_protect... · Wind speed profile models •...

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© University of Reading 2008 www.reading.ac.uk 04 October 2012

Vertical wind profiles over Greater London Daniel Drew

[email protected]

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Introduction To design tall buildings in urban areas, wind engineers need to calculate the potential

wind loading on the structure.

This requires information on:

• Geometry of the structure

• Geometry and proximity of the structures upwind

• Characteristics of the approaching wind

Wind loading codes inform the calculation process- design wind loads

• 50-year return period hourly mean wind speed

Wind speed profiles in strong wind conditions

• Neutral stability

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Wind speed profile models

• Power Law (Japan, Canada)

𝑈 𝑧 = 𝑈𝑟𝑒𝑓𝑧

𝑧𝑟𝑒𝑓

∝

α =0.32 for an urban surface (Cook, 1985).

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• Log law (Eurocode)

𝑈 𝑧 =𝑢∗

𝜅ln

𝑧

𝑧0 z0=0.8 m for an urban surface (Cook, 1985).

• Deaves and Harris Model (UK, Australia)

𝑈 𝑧 =𝑢∗𝑘

𝑙𝑛𝑧

𝑧0+ 5.75

𝑧

ℎ− 1.88

𝑧

ℎ

2

− 1.33𝑧

ℎ

3

+ 0.25𝑧

ℎ

4

h, the height of the boundary layer is assumed to equal 3250 m.

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1.6 km Marylebone Road BT Tower

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Lidar

• User configurable scan pattern.

• Doppler Beam Swinging (DBS): a 3-beam wind-profiling method

(Lane and Barlow).

• 30 m vertical resolution (80 gates).

• First 3 gates are unusable (lowest observation at 110 m agl).

• 2 minutes between each scan.

• 21st May 2011 – 6th Jan 2012.

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Mean wind speed profile

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Wind speed profiles in strong winds

LOW:

U<UQ25

MEDIUM:

UQ25<U<UQ50

HIGH:

UQ50<U<UQ75

VERY HIGH:

U>UQ75

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Profile data filtered by the wind speed measured in lowest gate, U(110).

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Mean wind speed profiles

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Terrain-dependent parameters

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Observations from BT Tower analysed to estimate U*

𝑈∗2 = 𝑢′𝑤′2 + 𝑣′𝑤′2

𝛼 =1

ln(𝑧1𝑧2)

0.5

𝑧0

z0 and α values lower than those given in UK code (z0=0.8 m, α=0.32).

ℎ =𝑈∗6𝑓

Boundary layer height lower than 3250 m.

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Results

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225° 270°

315°

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Conclusions

• Presented wind speed profiles derived from lidar observations.

• Deaves and Harris model, using parameters given in code provides a good

representation of the wind speed profile in strong wind conditions over

Greater London.

• Scope for improving models by using a detailed assessment of surface

parameters.

• Limitations of Doppler lidar in urban areas restricts potential to assess wind

loading models- potential for Sodar.

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