Environmental Engineering Reference
In-Depth Information
Fig. 7
Mapped predicted altitudes of common scoters at the Horns Rev 2 wind farm during tail
wind (
upper left
) with associated model standard errors (
lower left
). The same predictions are
visualised along a “theoretical” transect trough the investigated area (see
upper left
) 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
Table 4
Collision risk estimates for wintering common scoters at HR1 and HR2 offshore wind
farms, along with species-specific values of key input parameters
Horns Rev 1
Horns Rev 2
Common scoter
Mean density of all wintering birds, individual/km
2
156.05 274.05
% of birds flying (from ship surveys) 1 % 1 %
Mean density of flying birds in winter (Nov-Apr), individual/km
2
1.56 2.74
% of bird flying at rotor height 2.3 % 6.1 %
Collision risk (98 % avoidance), number of birds colliding 31 178
Collision risk (99.5 % avoidance), number of birds colliding 8 45
Collision risk calculated for pessimistic (98 % avoidance rate) and optimistic (99.5 % avoidance
rate) scenarios
