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| Titel |
WegenerNet 1km-scale sub-daily rainfall data and their application: a hydrological modeling study on the sensitivity of small-catchment runoff to spatial rainfall variability |
| VerfasserIn |
Sungmin Oh, Clara Hohmann, Ulrich Foelsche, Jürgen Fuchsberger, Wolfgang Rieger, Gottfried Kirchengast |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250139188
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| Publikation (Nr.) |
 EGU/EGU2017-2373.pdf |
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| Zusammenfassung |
| WegenerNet Feldbach region (WEGN), a pioneering experiment for weather and climate
observations, has recently completed its first 10-year precipitation measurement
cycle. The WEGN has measured precipitation, temperature, humidity, and other
parameters since the beginning of 2007, supporting local-level monitoring and modeling
studies, over an area of about 20 km x 15 km centered near the City of Feldbach
(46.93 ˚ N, 15.90 ˚ E) in the Alpine forelands of southeast Austria. All the 151
stations in the network are now equipped with high-quality Meteoservis sensors as of
August 2016, following an equipment with Friedrichs sensors at most stations before,
and continue to provide high-resolution (2 km2/5-min) gauge based precipitation
measurements for interested users in hydro-meteorological communities. Here
we will present overall characteristics of the WEGN, with a focus on sub-daily
precipitation measurements, from the data processing (data quality control, gridded data
products generation, etc.) to data applications (e.g., ground validation of satellite
estimates).
The latter includes our recent study on the propagation of uncertainty from rainfall to
runoff. The study assesses responses of small-catchment runoff to spatial rainfall variability
in the WEGN region over the Raab valley, using a physics-based distributed hydrological
model; Water Flow and Balance Simulation Model (WaSiM), developed at ETH Zurich
(Schulla, ETH Zurich, 1997). Given that uncertainty due to resolution of rainfall
measurements is believed to be a significant source of error in hydrologic modeling especially
for convective rainfall that dominates in the region during summer, the high-resolution of
WEGN data furnishes a great opportunity to analyze effects of rainfall events on the runoff at
different spatial resolutions. Furthermore, the assessment can be conducted not only for the
lower Raab catchment (area of about 500 km2) but also for its sub-catchments
(areas of about 30-70 km2). Beside the question how many stations are necessary
for reliable hydrological modeling, different interpolation methods like Inverse
Distance Interpolation, Elevation Dependent Regression, and combinations will be
tested.
This presentation will show the first results from a scale-depending analysis of spatial and
temporal structures of heavy rainfall events and responses of simulated runoff at the event
scale in the WEGN region. |
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