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L.K. Amekudzi, W. Agyakwah, Y. Bashiru, E. Quansah
Meteorology and Climate Science Unit, Department of Physcis, KNUST
Email: [email protected]
Comparison of QWeCI Automated and GMet Non-automated Rain Gauges at
Different Observatories in Kumasi
2
OUTLINE
Introduction
Methodology
Results and Discussion
Conclusions
3
Introduction
• Accurate observation and reliable rainfall data is a key for understanding impact of rainfall on climate.
• Check the accuracy and internal consistency of new rain gauges
• Cross validation
• Understanding of rainfall variation in Kumasi
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STUDY AREA
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Standard Meteorological Rain
gauge
Pluvio Rain gauge
Tipping Bucket
Rain gauge
METHODOLOGY
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June July October November December
0.00
50.00
100.00
150.00
200.00
250.00
300.00
Months
Month
ly R
ain
fall
(m
m)
May
June
July
August
Septe
mber
Oct
ober
Nov
ember
Dec
ember
0
50
100
150
200
250
300
350
400
Months
Month
ly R
ain
fall
(m
m)
AUTOMATED AND GMET RAIN GAUGES
Airport Pluvio
Agromet Pluvio
Owabi Pluvio
Emena Pluvio
Airport SMR
Agromet SMR
Owabi SMR
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0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.00.0
10.0
20.0
30.0
40.0
50.0
60.0
R² = 0.862057121039434
TIPPING BUCKET
GM
ET
DAILY COMPARISM BETWEEN INSTRUMENTS AT OWABI
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0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.00.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
R² = 0.981044545899142
PLUVIO
GM
ET
DAILY COMPARISM BETWEEN INSTRUMENTS AT AIRPORT
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0 20 40 60 80 100 1200.0
20.0
40.0
60.0
80.0
100.0
120.0
R² = 0.972208360501735
PLUVIO
GM
ET
DAILY COMPARISM BETWEEN INSTRUMENTS AT AGROMET
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CONCLUSION AND RECOMMENDATIONS
• Owabi, Airport and Agromet recorded the highest rainfall in June, October, and July respectively.
• The lowest rainfall amounts were observed in July at Owabi and in December at Airport and Agromet.
• Perfect agreement between automated and non-automated rain gauges
CONCLUSION
STATION CORRELATION
OWABI 0.928
AIRPORT 0.990
AGROMET 0.985
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• Consistent calibration
•Diameter of the instruments should be the same(Throat)
• Study should be continued for longer period of years
RECOMMENDATIONS
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THANK YOU
