View
40
Download
1
Category
Tags:
Preview:
DESCRIPTION
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. - PowerPoint PPT Presentation
Citation preview
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
VAD/VVP Wind Vector Retrieval
Bird Migration in De Bilt
Std.Dev. < 2 m/s
12 UTC 16-03-2004 – 12 UTC 18-03-2004
Heig
ht
0-6
km
Std.Dev. > 2 m/s
Hig
h q
ualit
y w
ind
pro
file
s
Std.Dev. < 2 m/s
Hirlam NWP
WRWP and radiosonde
WRWP WRWP
RDSRDS
Flycatcher Bird Radar2.4 degX-band160 kW0.2 s
RHI from Flycatcher Bird Radar
Range from radar
Heig
ht
weather radar
bird radar
Weather
Big bird
Small bird
March – May 2003
80 km
Th
resh
old
Bird Detection Criteria Standard Deviation > 2.0 m/s Radar Reflectivity < –5 dBZ “Wind” Speed > 6 m/s
Weather radar
YES NO
TOTB+DA+C
C+DD
correct rejections
Cfalse
alarmsNO
A+BB
missesA
hitsYES
Weather radar
YES NO
TOTB+DA+C
C+DD
correct rejections
Cfalse
alarmsNO
A+BB
missesA
hitsYES
Weather radar
YES NO
19700144015319
15859138302029NO
38615713290YES
Bird
rad
ar
Bird
rad
ar
Weather radar
YES NO
19700144015319
15859138302029NO
38615713290YES
Weather radar
YES NO
19700144015319
15859138302029NO
38615713290YES
Bird
rad
ar
Bird
rad
ar
FC=86.8, POD=85.2, FAR=38.1, Bias=1.38 Threshold 1 bird/km3, per hour per 200 meter
Speed and Direction
Direction bins of 15 deg
Speed bias of –3.5 m/s
Bias corrected
Speed bins of 3 m/s
Correspondence fraction
0.0 0.2 0.4 0.6 0.8 1.0
Alti
tud
e (
km)
0
1
2
3
4
SpeedDirection
Ass
ess
ment
of
Bir
d
Den
sity
Bird radar
WRWP
Bird Density
TBD = 0.29 + 0.09 VIR
OPERA: 150 radars100
Doppler3 Dual-pol
Conclusion and Outlook
Bird movement can be extracted from WRWPCollocated, dedicated comparison neededApplication on European network?
Recommended