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2017 ; 7
(1
): 11681
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Horizontal extent of the urban heat dome flow
#MMPMID28916810
Fan Y
; Li Y
; Bejan A
; Wang Y
; Yang X
Sci Rep
2017[Sep]; 7
(1
): 11681
PMID28916810
show ga
Urban heat dome flow, which is also referred to as urban heat island circulation,
is important for urban ventilation and pollutant transport between adjacent
cities when the background wind is weak or absent. A "dome-shaped" profile can
form at the upper boundary of the urban heat island circulation. The horizontal
extent of the heat dome is an important parameter for estimating the size of the
area it influences. This study reviews the existing data on the horizontal extent
of the urban heat dome flow, as determined by using either field measurements or
numerical simulations. A simple energy balance model is applied to obtain the
maximum horizontal extent of a single heat dome over the urban area, which is
found to be approximately 1.5 to 3.5 times the diameter of the city's urban area
at night. A linearized model is also re-analysed to calculate the horizontal
extent of the urban heat dome flow. This analysis supports the results from the
energy balance model. During daytime, the horizontal extent of the urban heat
dome flow is found to be about 2.0 to 3.3 times the urban area's diameter, as
influenced by the convective turbulent plumes in the rural area.
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