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| Titel |
Undercatch of tipping-bucket gauges in high rain rate events |
| VerfasserIn |
C. E. Duchon, C. J. Biddle |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Precipitation: Measurement, Climatology, Remote Sensing, and Modeling (EGU Session 2009) ; Nr. 25 (2010-03-08), S.11-15 |
| Datensatznummer |
250015730
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| Publikation (Nr.) |
 copernicus.org/adgeo-25-11-2010.pdf |
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| Zusammenfassung |
We have investigated differences in rainfall accumulations for
seven high rain rate events from three gauges: a Geonor T-200B
vibrating-wire weighing gauge and two MetOne tipping-bucket gauges. The
Geonor gauge and one tipping-bucket gauge are located in a pit so that their
collection orifices are at ground level. Thus their measured rainfall
accumulations are minimally affected by wind speed. The other tipping-bucket
gauge is located 105 m from the pit and is surrounded by an Alter-type
slatted wind screen. Its collection orifice is positioned 1 m above ground
level.
The results from the seven events show that the tipping-bucket gauges
noticeably underestimated storm event rainfall totals relative to the
weighing-bucket gauge when 1-min rain rates exceeded about 50 mm/h
(2 in/h). In addition, we conclude that observable wind induced undercatch
by the aboveground tipping bucket gauge begins when the wind speed at a height
of 2 m exceeds around 5 m/s. In this paper we show and discuss time series of rain rates, differences in
rain rates, and wind speeds for two of the seven events in an attempt to
account for the lower storm totals from the two tipping bucket gauges
relative to the weighing-bucket gauge. |
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