A holistic microclimate model

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apps:biomet_utci [2015/12/22 22:27]
enviadmin
apps:biomet_utci [2017/11/10 09:25] (current)
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-As the UTCI calculation expects the wind given at the 10 m level, ENVI-met BioMet uses the calculated local wind speed in the model domain related to the pedestrian level (zlevel) and scales it up to the  10 m level equivalent using the logarithmic wind power profile  +As the UTCI calculation expects the wind given at the 10 m level, ENVI-met BioMet uses the calculated local wind speed $Wind_{zlevel}$ ​in the model domain related to the pedestrian level ($zlevel$) and scales it up to the  10 m level equivalent using the logarithmic wind power profile  
-$$ Wind_{10m} ​:= \frac{ln(10 / z0)}{ln(zlevel / z0)} \cdot Wind_{zlevel}$$+$$ Wind_{10m} = \frac{ln(10 / z0)}{ln(zlevel / z0)} \cdot Wind_{zlevel}$$
  
-In other word, if you calculate UTCI at some point for zlevel= 1.6 m, all ENVI-met data such as air temperature or radiative temperature will be used from this level, except of the wind speed which will be extrapolated to the 10 m level value.+In other words, if you calculate UTCI at some point for zlevel= 1.6 m, all ENVI-met data such as air temperature or radiative temperature will be used from this level, except of the wind speed which will be extrapolated to the 10 m level value.
  
 Obviously, that doesn'​t make much sense as the $z0$ roughness value is unknown for most sites, but ENVI-met provides detailed and calculated wind flow data for all levels. ​ Obviously, that doesn'​t make much sense as the $z0$ roughness value is unknown for most sites, but ENVI-met provides detailed and calculated wind flow data for all levels. ​