observation report of mrr (3) tomoki koshida research fellow of oki/kanae lab
TRANSCRIPT
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
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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
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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
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5.0
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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