Fine Scale Meteorology & Air Quality Models - School of Architecture ...

ASI2_Lecture 3_7/12/2011
Urban Modeling in WRF-Noah
Three parameterization schemes
Multi-layer Urban Canopy Model:
Building Effect Parameterization
(BEP)
• Direct interactions with WRF PBL
scheme at multiple vertical layers
• Calculate effects of buildings on
momentum and heat fluxes
• Modify TKE scheme and turbulent
length scales
• Available since WRF3. 1
sf_surface_physics = 2 (Noah)
sf_urban_physics = 2
• works with WRF’s BouLac and MYJ
ASI 2: URBAN CLIMATE AND AIR POLLUTION School of Architecture, The Chinese University of Hong Kong, Hong Kong, 7-8 Dec 2011
Implementation of BEP & BEP_ BEM in WRF
• Building Environment Parameterization (BEP, Martilli et al.)
– Sub-grid wall, roof, and road effects on radiation and fluxes
– Can be used with MYJ PBL or BouLac PBL to represent buildings higher
than lowest model levels (Multi-layer urban model)
• Building Energy Model (BEM, Martilli and Salamanca)
– Includes anthropogenic building effects (heating, air-conditioning) in
addition to BEP
– The natural ventilation, the heat generated by equipment and
occupants, the convective heat through the walls, and the radiation
through the windows are considered in the model.
– The UCP(BEP) and BEP-BEM (with and without the AC systems)
schemes have been evaluated against urban energy balances fluxes
measured in the BUBBLE experiment.
ASI 2: URBAN CLIMATE AND AIR POLLUTION School of Architecture, The Chinese University of Hong Kong, Hong Kong, 7-8 Dec 2011
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