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| Titel |
Anatomy of extraordinary rainfall and flash flood in a Dutch lowland catchment |
| VerfasserIn |
C. C. Brauer, A. J. Teuling, A. Overeem, Y. Velde, P. Hazenberg, P. M. M. Warmerdam, R. Uijlenhoet |
| 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 ; 15, no. 6 ; Nr. 15, no. 6 (2011-06-27), S.1991-2005 |
| Datensatznummer |
250012865
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| Publikation (Nr.) |
 copernicus.org/hess-15-1991-2011.pdf |
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| Zusammenfassung |
On 26 August 2010 the eastern part of The Netherlands and the
bordering part of Germany were struck by a series of
rainfall events lasting for more than a day. Over an area of
740 km2 more than 120 mm of rainfall were observed in 24 h. This
extreme event resulted in local flooding of city centres, highways and
agricultural fields, and considerable financial loss.
In this paper we report on the unprecedented flash flood triggered by
this exceptionally heavy rainfall event in the 6.5 km2 Hupsel
Brook catchment, which has been the experimental watershed employed by
Wageningen University since the 1960s. This study aims to improve our
understanding of the dynamics of such lowland flash floods. We present
a detailed hydrometeorological analysis of this extreme event,
focusing on its synoptic meteorological characteristics, its
space-time rainfall dynamics as observed with rain gauges, weather
radar and a microwave link, as well as the measured soil moisture,
groundwater and discharge response of the catchment.
At the Hupsel Brook catchment 160 mm of rainfall was observed in
24 h, corresponding to an estimated return period of well over 1000 years.
As a result, discharge at the catchment outlet increased
from 4.4 × 10−3 to nearly 5 m3 s−1.
Within 7 h discharge rose from 5 × 10−2 to
4.5 m3 s−1.
The catchment response can be divided into four phases: (1) soil moisture reservoir
filling, (2) groundwater response, (3) surface depression filling and surface runoff and (4) backwater feedback.
The first 35 mm of rainfall were stored in the soil without a significant increase in discharge.
Relatively dry initial conditions (in comparison to those for past discharge extremes)
prevented an even faster and more extreme hydrological response. |
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