On the Altitudinal Distribution of Birds and Bird Strikes in the Netherlands,
ROYAL NETHERLANDS AIR FORCE VOLKEL
Pagination or Media Count:
Bird strikes, radar observations and visual counts are discussed and used to reconstruct altitudinal distributions of bird movements over The Netherlands. Bird density curves, particularly for the lowest 1000 ft, are urgently needed with respect to solving the problem of a recent rapid increase of bird strike rates due to the intensification of low level training by RNLAF fighter aircraft. The long range surveillance radars, presently in use to provide data for bird migration warning systems in several West European countries, fail to cover the lowest air layers. This gap may be filled up by field observers andor small radars. Parallel to visual observations and time lapse film recordings at the long range surveillance radar in NW Holland, a series of altitude measurements has been collected. This preliminary study with a tracking radar of the type Flycatcher provided the data to illustrate the problem and its possible solutions.