Spores detachment

The wind dispersal of the spores (Dwind, 0-1) is simulated on a daily basis according to Aylor (1982), as a function of daily wind speed:

where Wind is daily wind speed (m s-1), Windmin is the minimum wind speed for spore detachment (m s-1), Wind50 is the wind speed for the detachment of 50% of spores (m s-1), Windmax is the wind speed for the maximum spore detachment (m s-1). The term c is derived as:

Where b (unitless) and a (m-1 s) are derived according to the Equations reported below:

The parameters Windmin, Windmax and Wind50 are pathogen specific values, and can be set according to literature or measured with experimental trials.

The resulting function is plotted in the Figure below, with different values of Wind50 to show the flexibility of the function to different parameterization.

Spores detachment as a function of wind speed. The function obtained

using three Wind50 values are plotted (Windmin=3 m s-1, Windmax=15 m s-1)

Created with the Personal Edition of HelpNDoc: Full-featured Kindle eBooks generator