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| Titel |
The Wageningen Lowland Runoff Simulator (WALRUS): implementation and application to the freely draining Hupsel Brook catchment and controlled Cabauw polder |
| VerfasserIn |
Claudia Brauer, Paul Torfs, Ryan Teuling, Remko Uijlenhoet |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250098337
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| Publikation (Nr.) |
 EGU/EGU2014-14007.pdf |
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| Zusammenfassung |
| Recently, we developed the Wageningen Lowland Runoff Simulator (WALRUS) to fill
the gap between complex, spatially distributed models which are often used in
lowland catchments and simple, parametric models which have mostly been developed
for mountainous catchments. This parametric rainfall-runoff model can be used
all over the world in both freely draining lowland catchments and polders with
controlled water levels. Here, we present the model implementation, opportunities for
practical application and experience from validation studies with data from two field
sites.
The open source model code is implemented in R and is set-up such that it can be used by
both practitioners and researchers. For direct use by practitioners, defaults are implemented
for relations between model variables and to compute initial conditions, leaving only four
parameters which require calibration. For research purposes, the defaults can easily be
changed.
WALRUS is computationally efficient, which allows operational forecasting and
uncertainty estimation by creating ensembles. An approach for flexible time steps
increases numerical stability and makes model parameter values independent of
time step size, which facilitates use of the model with the same parameter set for
multi-year water balance studies as well as detailed analyses of individual flood
peaks.
We applied WALRUS to two contrasting Dutch catchments: the slightly sloping, freely
draining Hupsel Brook catchment and the flat Cabauw polder with controlled water levels. In
both catchments, WALRUS performs well during the years used for calibration and
validation. The model also performs well during extremely wet periods (flash flood in the
Hupsel Brook catchment in August 2010) and extremely dry periods (summer 1976) and can
forecast the effect of control operations (changing weir elevations and surface water
supply). |
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