Date post: | 13-Dec-2015 |
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Today’s topic
The difference of rain fall rate by MRR and by ground based rain gauge
1. Check the ground based
2. check the MRR algorism
From Previous talk
rr200mと地上雨量の比較
0
20
40
60
80
100
120
0 10 20 30 40 50 60
0.5mm mmバケツ雨量計雨量( )
mm/h
レーダ雨量(
)
The result of check
0.5mm 雨量計の検定結果 y = 0.91 xR2 = 0.99
0
10
20
30
40
50
0 10 20 30 40 50 60
流入から見積もられる雨量
地上雨量計のイベントから算
出される雨量
Next check MRR algorism
• Observed the reflectivity by Doppler spectrum(observed speed)
• Doppler spectrum related to rain drop size
• The reflectivity related to the number of drops
number distribution
粒径分布の比較
1.E-011.E+001.E+011.E+021.E+031.E+041.E+051.E+061.E+07
0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00
粒径
スペクトル密度
2.2mm/ h 22.4mm/ h 60mm/ h 110mm/ h
Contribution by drop size spectrum
粒径別の降水強度に対する寄与率
0.0
5.0
10.0
15.0
20.0
25.0
0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00
(mm)粒径
(mm
/h)
降水強度
2mm/ h 24mm/ h 60mm/ h 110mm/ h