Environmental Engineering Reference
In-Depth Information
Table 1 Significance and t- and F-values for the fixed parametric (wind directions, wind farm and
survey year) and smooth terms included in the GAMM for the northern gannet
t-value
p-value
Parametric
Tail wind
3.326
<0.01
Side wind
2.928
<0.01
HR2
1.262
0.208
Season 2
1.257
0.210
Season 3
3.242
<0.01
Season 4
3.019
<0.01
Smooth
F-value
p-value
Dist. to turbine
-
-
Wind speed
8.106
<0.01
Humidity
7.001
<0.01
Pressure
13.295
<0.01
R-sq. (adj) 0.35
Spearman's Rho 0.70
Sample size 442
The model was evaluated by fitting the model on 70 % and testing the predictive accuracy on 30 %
by estimating Spearman's rank correlation coefficient (Rho) between observed and predicted alti-
tudes. Adjusted R 2 value is given as an indication of variance explained by the model
Fig. 4 Mapped results of the predicted altitude of birds at two wind farms (Horns Rev 2, upper and
Horns Rev 1, lower), along a “theoretical” transect through the investigated area for the northern
gannet during head winds, tail winds and side winds, with all other predictor variables set to mean
conditions. The dashed lines around the predictions indicate the standard errors. The rotor swept
area is defined by the rectangle with shading red lines
 
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