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| Titel |
Radar Analyses of Space-Time Variability of Extreme Flood-Producing Rainfall in Urban Drainage Basins |
| VerfasserIn |
G. Villarini, J. A. Smith, M. L. Baeck, P. Sturdevant-Rees, W. F. Krajewski |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250024044
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| Zusammenfassung |
| The Charlotte, North Carolina metropolitan area has experienced extensive urban and
suburban growth during the past 40 years, resulting in increasing flood hazards in the region.
Record flooding in the urban core of Charlotte occurred on 23 July 1997 from a
storm that produced rainfall accumulations of more than 250 mm during an 18
hour period, more than doubling the 24 hour rainfall maximum in Charlotte, and
causing $60 million in property damage and three fatalities. Analyses of the 23
July 1997 storm and flood are based on rainfall and discharge observations from
dense networks of rain gages and stream gages maintained by the U.S. Geological
Survey and rainfall estimates from two WSR-88D weather radars, both located
approximately 100 km from the urban core of Charlotte. This wealth of observations
provides an opportunity to address hydrometeorological questions concerning: (1) the
accuracy of radar rainfall estimates for extreme, flood-producing rainfall; (2) the
space-time variability of extreme, flood-producing rainfall in urban environments; and (3)
the effects of urbanization on extreme flood response in urban environments. It is
shown that bias-corrected radar rainfall estimates for the 23 July 1997 storm are
quite accurate and provide the capability for resolving the fundamental rainfall
forcing associated with regional variation in extreme flood response. This study
shows how the spatial and temporal variability of rainfall combines with the land
surface properties to determine extreme flood response in urban drainage basins. |
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