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| Titel |
Spatial and temporal resolution effects on urban catchments with different imperviousness degrees |
| VerfasserIn |
Elena Cristiano, Marie-Claire ten Veldhuis, Nick C. van de Giesen |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250111971
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| Publikation (Nr.) |
 EGU/EGU2015-12125.pdf |
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| Zusammenfassung |
| One of the main problems in urban hydrological analysis is to measure the rainfall at urban
scale with high resolution and use these measurements to model urban runoff processes to
predict flows and reduce flood risk. With the aim of building a semi-distribute hydrological
sewer model for an urban catchment, high resolution rainfall data are required as input. In this
study, the sensitivity of hydrological response to high resolution precipitation data for
hydrodynamic models at urban scale is evaluated with different combinations of spatial and
temporal resolutions. The aim is to study sensitivity in relation to catchment characteristics,
especially drainage area size, imperviousness degree and hydraulic properties such as special
structures (weirs, pumping stations). Rainfall data of nine storms are considered with 4
different spatial resolutions (3000m, 1000m, 500m and 100m) combined with 4
different temporal resolutions (10min, 5min, 3min and 1min). The dual polarimetric
X-band weather radar, located in the Cabauw Experimental Site for Atmospheric
Research (CESAR) provided the high resolution rainfall data of these rainfall events,
used to improve the sewer model. The effects of spatial-temporal rainfall input
resolution on response is studied in three Districts of Rotterdam (NL): Kralingen,
Spaanse Polder and Centrum district. These catchments have different average
drainage area size (from 2km2 to 7km2), and different general characteristics.
Centrum district and Kralingen are, indeed, more various and include residential and
commercial areas, big green areas and a small industrial area, while Spaanse Polder is a
industrial area, densely urbanized, and presents a high percentage of imperviousness. |
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