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Iwan Holleman (KNMI) Hans van Gasteren (RNLAF,UvA) Willem Bouten (UvA)

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. Migrating Lapwings. VAD/VVP Wind Vector Retrieval. Std.Dev. > 2 m/s. Std.Dev. < 2 m/s. Bird Migration in De Bilt.

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Iwan Holleman (KNMI) Hans van Gasteren (RNLAF,UvA) Willem Bouten (UvA)

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  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 Migrating Lapwings

  2. VAD/VVP Wind Vector Retrieval

  3. Std.Dev. > 2 m/s Std.Dev. < 2 m/s Bird Migration in De Bilt Height 0-6 km 12 UTC 16-03-2004 – 12 UTC 18-03-2004

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

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

  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. Bird radar WRWP Assessment of Bird Density TBD = 0.29 + 0.09 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

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