Thursday, 17 August 2000: 3:30 PM
Numerical experiments were conducted to simulate the advection processes between the
greenery patch and architectural complex , and the water and energy balance processes
among air, vegetation canopy and buildings. A biosphere parameterization scheme, which
was developed according to the data of field experiment carried out in Beijing City,
is used to describe the surface and subsurface water transfer processes and the effects
of water on the surface energy budget. In this scheme the parameters such as the
volumetric surface soil moisture, the bulk soil moisture,the ground surface and
vegetation medium temperature, and soil mean temperature etc. are included to represent
the evaporarion from soil, transpiration from the canopy,latent heat flux, sensible
heat flux as well as soil heat flux. The architectural complex is treated as porous
medium. A space averaging technique allows computations inside the urban canopy layer
with accouting for the volume of buildings and canopy structures. Total radiation,
sensible heat, substrate heat, anthropogenic heat exchange between buildings and air
are computed for architectural complex. The model is used to investigate the influences
of greenery patches with different sizes and vegetation types on the microclimate of the
urban canopy layer. Results indicate that the woodland or lawn with horizontal range of
50-100m has obvious influences on the distribution of temperature and moisture within
the architectural complex. The relationship of the effects of greener patches with
building density , building heights , street canyon width etc. is also discussed.
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