Dzhankeldy 500MW Wind Farm
ESIA Volume 2- Main Text, Tables & Figures
259
R
ECEPTOR
V
ALUE
/
S
ENSITIVITY
M
AGNITUDE
R
ESIDUAL
Nationally
Important Herptiles
Medium
Negligible
Negligible to
minor
Non-threatened Herptiles&
Invertebrates
Low / Lower
Negligible
Negligible to
minor
7.3.2.2
Biodiversity Loss
T
URBINE
C
OLLISION
(B
IRDS
)
Wind Farms pose a unique threat to birds due to the potential for collision with moving turbines.
It has been well documented at existing wind farm developments that turbine collisions result
in mortality of birds. However, the magnitude of risk and significance of the potential impact
is highly dependent upon the location of the wind farm and landscape context, spatial layout,
height and length of turbines, and the types and numbers of birds present. In order to
assess
the potential impacts, separate assessments are undertaken
which are species-specific,
location specific and season specific.
Generally, larger soaring birds and ‘poor fliers’ with high wing-loading are thought
to be at higher risk.
Migratory individuals are at higher risk than residents.
Raptors have restricted forward field of view that may reduce
visibility of turbines
and avoidance ability.
Research indicates that many migratory birds, particularly waterfowl, potentially
avoid wind farms at macro scales.
Quantitative assessment was undertaken by utilizing a Collision Risk Model (CRM) developed
as
per SNH Guidelines, using Band et. al predictive modelling.
It is important to note that avoidance rates are predicted and have a large weight on the final
collision risk predictions. Further, avoidance behaviour is not only species-specific but may also
be influenced by (1) turbine locations and (2) weather conditions (visibility / flight ability).
Therefore, even low predicted collision rates do not exclude the need for adaptive mitigation
approaches (detailed subsequently).
The CRM for the species of concern is presented below.
Dzhankeldy 500MW Wind Farm
ESIA Volume 2- Main Text, Tables & Figures
260
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