WetSpa model application in the Distributed Model Intercomparison Project (DMIP2).

Alireza Safari Myandareh, Florimond De Smedt, Fekadu Moreda

Onderzoeksoutput: Articlepeer review

Samenvatting

This paper describes the application of a spatially distributed hydrologic model (WetSpa) Water and
Energy Transfer between Soil, Plants and Atmosphere, for the second phase of the Distributed Model
Intercomparison Project (DMIP2) study. The model implementation is based on 30-m spatial resolution
and 1 h time-step for all basins and interior watersheds involved in the DMIP study. Rainfall inputs are
derived from Next Generation Radar (NEXRAD). The distributed model parameters are based on an extensive
database of watershed characteristics available for the region, including digital maps of topography,
soil type, and landuse. The model is calibrated and validated on part of the river flow records for each
basin and applied to the smaller interior watersheds not used in calibration to assess the model performance
in ungaged basins. The statistics improve significantly with calibration of the global model parameters
but even for uncalibrated simulations, the WetSpa model reproduces flow rates of acceptable
accuracy for most cases. To evaluate the model performance during calibration and validation periods,
an Aggregated Measure (AM) is introduced that measures different aspects of the simulated hydrograph
such as shape, size and volume. The statistics for the five calibration basins show that the model produces
very good to excellent results for the calibration period. With the exception of Blue River basin, the overall
model performance for the validation period remains good to very good, indicating that the model is able
to simulate the relevant hydrologic processes in the basins accurately. The performance of the uncalibrated
model for the subcatchments is more variable, but the hourly flow rates generally reproduced
with reasonable accuracy indicating an encouraging performance of the model.
Originele taal-2English
Pagina's (van-tot)78-89
Aantal pagina's12
TijdschriftJournal of Hydrology
Volume418-41
StatusPublished - 2011

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