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| Titel |
Optimization of precipitation inputs for SWAT modeling in mountainous catchment |
| VerfasserIn |
Ye Tuo, Gabriele Chiogna, Markus Disse |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250123854
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| Publikation (Nr.) |
 EGU/EGU2016-3178.pdf |
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| Zusammenfassung |
| Precipitation is often the most important input data in hydrological models when
simulating streamflow in mountainous catchment. The Soil and Water Assessment
Tool (SWAT), a widely used hydrological model, only makes use of data from one
precipitation gauging station which is nearest to the centroid of each subcatchment,
eventually corrected using the band elevation method. This leads in general to inaccurate
subcatchment precipitation representation, which results in unreliable simulation
results in mountainous catchment. To investigate the impact of the precipitation
inputs and consider the high spatial and temporal variability of precipitation, we first
interpolated 21 years (1990-2010) of daily measured data using the Inverse Distance
Weighting (IDW) method. Averaged IDW daily values have been calculated at the
subcatchment scale to be further supplied as optimized precipitation inputs for
SWAT. Both datasets (Measured data and IDW data) are applied to three Alpine
subcatchments of the Adige catchment (North-eastern Italy, 12100 km2) as precipitation
inputs. Based on the calibration and validation results, model performances are
evaluated according to the Nash Sutchliffe Efficiency (NSE) and Coefficient of
Determination (R2). For all three subcatchments, the simulation results with IDW inputs
are better than the original method which uses measured inputs from the nearest
station. This suggests that IDW method could improve the model performance
in Alpine catchments to some extent. By taking into account and weighting the
distance between precipitation records, IDW supplies more accurate precipitation
inputs for each individual Alpine subcatchment, which would as a whole lead to an
improved description of the hydrological behavior of the entire Adige catchment. |
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