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| Titel |
Accuracy of rainfall measurement for scales of hydrological interest |
| VerfasserIn |
S. J. Wood, D. A. Jones, R. J. Moore |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 4, no. 4 ; Nr. 4, no. 4, S.531-543 |
| Datensatznummer |
250001877
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| Publikation (Nr.) |
 copernicus.org/hess-4-531-2000.pdf |
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| Zusammenfassung |
| The
dense network of 49 raingauges over the 135 km2 Brue catchment in Somerset,
England is used to examine the accuracy of rainfall estimates obtained from
raingauges and from weather radar. Methods for data quality control and
classification of precipitation types are first described. A super-dense network
comprising eight gauges within a 2 km grid square is employed to obtain a
"true value" of rainfall against which the 2 km radar grid and a single
"typical gauge" estimate can be compared. Accuracy is assessed as a function
of rainfall intensity, for different periods of time-integration (15 minutes, 1
hour and 1 day) and for two 8-gauge networks in areas of low and high relief. In
a similar way, the catchment gauge network is used to provide the "true
catchment rainfall" and the accuracy of a radar estimate (an area-weighted
average of radar pixel values) and a single "typical gauge" estimate of
catchment rainfall evaluated as a function of rainfall intensity. A single gauge
gives a standard error of estimate for rainfall in a 2 km square and over the
catchment of 33% and 65% respectively, at rain rates of 4 mm in 15
minutes. Radar data at 2 km resolution give corresponding errors of 50% and 55%.
This illustrates the benefit of using radar when estimating catchment scale
rainfall. A companion paper (Wood et al., 2000) considers the accuracy of
rainfall estimates obtained using raingauge and radar in combination.
Keywords: rainfall, accuracy, raingauge, radar |
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