1. Iwan Holleman (KNMI) Hans van Gasteren (RNLAF,UvA) Willem Bouten (UvA)
Validation of Bird Movement Signatures in Weather Radar Wind Profiles using a Dedicated Bird Radar
Iwan Holleman (KNMI)
Hans van Gasteren (RNLAF,UvA)
Willem Bouten (UvA)
Migrating Lapwings

2. VAD/VVP Wind Vector Retrieval

3. Bird Migration in De Bilt
Std.Dev. < 2 m/s
Std.Dev. > 2 m/s
Height 0-6 km
12 UTC – 12 UTC

4. High quality wind profiles
WRWP
WRWP
Std.Dev. < 2 m/s
Hirlam NWP
WRWP and radiosonde
High quality wind profiles
RDS
RDS

5. Flycatcher Bird Radar
2.4 deg
X-band
160 kW
0.2 s

6. RHI from Flycatcher Bird Radar
Weather
80 km
Small bird
Height 
Big bird
March – May 2003
Range from radar

7. Threshold

8. Bird Detection Criteria
Standard Deviation > 2.0 m/s
Radar Reflectivity < –5 dBZ
“Wind” Speed > 6 m/s
FC=86.8, POD=85.2, FAR=38.1, Bias=1.38
Threshold 1 bird/km3, per hour per 200 meter

9. Speed and Direction Direction bins of 15 deg Speed bias of –3.5 m/s
Bias corrected
Speed bins of 3 m/s

10. Assessment of Bird Density
Bird radar
Assessment of Bird Density
WRWP
TBD = VIR
Bird Density

11. Conclusion and Outlook
Bird movement can be extracted from WRWP
Collocated, dedicated comparison needed
Application on European network?
OPERA:
150 radars
100 Doppler
3 Dual-pol