Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision | ||
apps:biomet_utci [2015/03/31 23:39] – enviadmin | apps:biomet_utci [2017/11/10 09:25] – external edit 127.0.0.1 | ||
---|---|---|---|
Line 8: | Line 8: | ||
* Height reference: UTCI always related to wind speed at 10 m height while the biometeorological parameters are normally define between 1.5 and 2 m... | * Height reference: UTCI always related to wind speed at 10 m height while the biometeorological parameters are normally define between 1.5 and 2 m... | ||
- | **Please Note**: | + | |
+ | 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 | ||
+ | $$ Wind_{10m} = \frac{ln(10 / z0)}{ln(zlevel / z0)} \cdot Wind_{zlevel}$$ | ||
+ | |||
+ | 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' | ||
+ | |||
+ | ==== Final Remarks ==== | ||
+ | We do not recommend to use UTCI in the regression-based version based on using 2m (1.6m) level wind speeds extrapolated to 10m. In a complex urban environment, | ||
+ | |||
+ | |||
+ | **Please Note**: | ||
**References** | **References** | ||
Link to the original source code and to the EU COST Action 730 Homepage: [[http:// | Link to the original source code and to the EU COST Action 730 Homepage: [[http:// |