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| Titel |
Rainfall resolution from weather radars and their application in urban drainage modelling |
| VerfasserIn |
G. Bruni, J. A. E. ten Veldhuis, T. Otto, H. Leijnse |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250061295
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| Zusammenfassung |
| Urban hydrological modelling requires high resolution rainfall data to be able to simulate fast
runoff processes and related short response times. Over the last three decades, rainfall input
into urban hydrological and hydrodynamic models has often been restricted to a single rain
gauge in or near the catchment, rendering rainfall input one of the main sources of
uncertainty in model calculations. In recent years, rainfall data from weather radars that
provide space-time estimates of rainfall are becoming increasingly available. C-band and
S-band radars have been used for operational precipitation measurements and offer spatial
resolutions of 1km2 to several km2. This resolution is still insufficient to meet the relevant
scales of urban hydrology (e.g. Berne et al. 2004; Emmanuel et al., 2011, Schellart
et al., in press). Higher spatial resolution rainfall measurements can be provided
by X-band radars, especially at short range where attenuation is not yet a major
factor.
At the Cabauw Experimental Site for Atmospheric Research (CESAR), an X-band
Doppler polarimetric radar has been installed as well as a dense network of rain gauges
(Leijnse et al., 2010). Data from the C-band Doppler radar at 25 km distance are also
available for this site. A network of 11 rain gauges is to be installed in the city area as well as
a network of water level sensors in the stormwater sewers.
A selection of rain events is analysed based on the available rainfall measurement
instruments for this site. The events are used as input into a hydrodynamic model of the sewer
system of the city of Utrecht, located between CESAR and the C-band radar site. The effect
of different spatial rainfall data resolutions and of rainfall data uncertainty on hydrological
response will be analysed for various sizes of catchments within the Utrecht sewer
system.
References
Berne, A., Delrieu, G, Creutin, J., and Obed, C. (2004). Temporal and spatial resolution
of rainfall measurements required for urban hydrology. Journal of Hydrology, 299,
166-179.
Emmanuel, I., Leblois, E., Andrieu, H, and Flahaut, B. (2011). Variabilité spatio-temporelle
des précipitations aux échelles de l’hydrologie urbaine. La Houille Blanche, 4,
31-36.
Leijnse, H., Uijlenhoet, R., van de Beek, C.Z., Overeem, A., Otto, T. , Unal, C.M.H.,
Dufournet, Y., Russchenberg, H.W.J., Figueras i Ventura, J., Klein Baltink, H., and
Holleman, I. (2010). Precipitation measurement at CESAR, the Netherlands. Journal of
Hydrometeorology, 11, 6, 1322-1329.
Schellart, A.N.A., Shepherd, W.J., and Saul, A.J. (in press). Influence of rainfall
estimation error and spatial variability on sewer flow prediction at a small urban scale. Adv
Water Resour (2011), doi:10.1016/j.advwatres.2011.10.012. |
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