Geoscience Reference
In-Depth Information
Figure 8.15.
Calculation of the meteorological risk index known as Carrega I85/90,
on July 5, 2005 at 15:00 UTC. Different successive layers were used, with each
layer representing a different meteorological variable. The index is
generated indirectly. Source: [CAR 07] (see color section)
8.3.3.4.
The direct recreation of the daytime meteorological risk, recorded at 15:00
UTC
The direct recreation of the meteorological risk index, during the day or at night,
leads to contrasting results, depending on the relief of the area. The direct recreation
of the meteorological risk index leads to a risk value that could be in the range of 8-
10 out of 20, and 19.5 out of 20. Whereas, the indirect recreation of the risk index
generates a risk value of between 15 and 19.5 out of 20 (Figure 8.16). This shows
that with the direct recreation of the risk index, there is a wider range of risk values
used.
Contrary to indirect indice, for the direct indice the (synoptic) wind is not plainly
interpolated, that increases the local effects associated with topography, and thus
enhances the contrasts due to relief.
