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Impact of urban boundary layer processes on sustainable building design

Impact of urban boundary layer processes on sustainable building design. Janet F. Barlow, C.R. Wood, D.R. Drew, W. Nogueira-Neto , S.E. Lane, A. Brocklehurst , C.S.B. Grimmond, A.G. Robins, S.G . Bradley and P. Klein.

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Impact of urban boundary layer processes on sustainable building design

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  1. Impact of urban boundary layer processes on sustainable building design Janet F. Barlow, C.R. Wood, D.R. Drew, W. Nogueira-Neto, S.E. Lane, A. Brocklehurst, C.S.B. Grimmond, A.G. Robins, S.G. Bradley and P. Klein Acknowledgements to: Rosy Wilson, John Lally, Ewan O’Connor, Marc Stringer Westminster City Council, BT

  2. School of Slavonic and Eastern European Studies, UCL, central London

  3. Assumptions about the wind made in design codes How to relate complex Case C to simple Case A by simple correction factors? Plate and Kiefer (2001)

  4. Aim: to challenge urban engineering practice by incorporating urban climate knowledge Funded by EPSRC under the Challenging Engineering programme (2009 – 2014) www.actual.ac.uk

  5. Advanced Climate Technology Urban Atmospheric Laboratory: Project Partners

  6. ACTUAL: observing flow at range of scales Barlow et al. 2011 ACP Doppler lidar 90m < z < 2000m Bradley and Barlow, ISARS conf 2012 NEW urban sodar <200m BT Tower at 190 m Wood et al. 2010 BLM Helfter et al. 2011 ACP Barlow et al. 2011 JWEIA Pauscheret al. ICUC8 poster (KCL) KCL: Scintillometers (various heights) Barlow et al. 2009 BLM Roof top at ~20m Wood et al. submitted to STOTEN

  7. Regents Park Roof-top site BT Tower Marylebone Road Thanks to Steve Evans, UCL 1.6 km

  8. How do urban winds and temperatures drive ventilation of buildings? • Room next to busy road • Use ambient pollution (NOx) as a tracer to monitor ventilation rate Aidan Brocklehurst, PhD with Building Research Establishment (BRE)

  9. How does building morphology affect heat fluxes? • NEW wind tunnel technique to simulate heat fluxes Pitched roof H/W=1.0 Wagner NogueiraNeto, PhD Jake Hacker (Arup CASE supervisor)

  10. How can we observe near surface wind profiles? • NEW “urban sodar” design • Less noise, fewer building reflections • Conventional mini-sodars great for high spatial resolution wind profiles • Poor noise characteristics! Visiting Prof. Stuart Bradley (Uni. of Auckland) Barlow et al. (2008) BLM

  11. How do measured BL wind profiles compare with engineering assumptions? • Doppler lidar observed wind using Doppler beam swinging (DBS) • c. 5000 hourly averaged wind profiles measured Dan Drew, post-doc LiDAR gate resolution L

  12. How do measured BL wind profiles compare with meteorological models? • Unified Model (UM) forecast model (blue), lidar (red) • 1.5km resolution, M. Best heat flux scheme • 22:00 UHI, strong jet present Sian Lane, PhD CASE award Met Office LiDAR gate resolution L

  13. What is the evolution of winds along an urban river throughout a day? • C – cloudy, S – sunny • Feb to May 2011 4 11 • New horizontal scanning lidar technique • Comparison with sonic anemometry, scintillometer Curtis Wood, post-doc (now FMI) Collaboration with Sue Grimmond et al. at KCL Wood et al. subm. STOTEN

  14. How do measured UBL turbulence profiles evolve? • Vertical velocity variance profiles scale well with mixing height • Night-time: shallow turbulent layer • Day-time: convective boundary layer, peak mid-BL Christos Halios, post-doc

  15. Conclusions • Study of urban atmospheres requires measurements at a wide range of scales • Modelling and measurement techniques in need of validation • Longer term measurements can aid sustainable city development Please visit www.actual.ac.ukto see more data!

  16. ICUC8 Tues 11:00: T2B/233 Wagner (air quality 5) Tues 11:15: T2D/664 Christos (UBL) Tues 14:00: T3D/72 Curtis (UBL) Tues 14:30: T3D/317 Sian (UBL) Weds 10:30: W2B/152 Dan (URSL) Weds 12:15: plenary UBL Fri 09:15: F1A/393 Aidan (Building Climates) Fri 11:00: F2A/200 JFB (Building Climates) Mon 16:45: M4B/647 Sylvia (urb AQ) Thu 12:15: Stephen plenary

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