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| Titel |
Results from a full coupling of the HIRHAM regional climate model and the MIKE SHE hydrological model for a Danish catchment |
| VerfasserIn |
M. A. D. Larsen, J. C. Refsgaard, M. Drews, M. B. Butts, K. H. Jensen, J. H. Christensen, O. B. Christensen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 11 ; Nr. 18, no. 11 (2014-11-28), S.4733-4749 |
| Datensatznummer |
250120538
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| Publikation (Nr.) |
 copernicus.org/hess-18-4733-2014.pdf |
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| Zusammenfassung |
| A major challenge in the emerging research field of coupling of existing
regional climate models (RCMs) and hydrology/land-surface models is the
computational interaction between the models. Here we present results from a
full two-way coupling of the HIRHAM RCM over a
4000 km × 2800 km domain at 11 km resolution and the combined MIKE SHE-SWET hydrology
and land-surface models over the 2500 km2 Skjern River catchment. A
total of 26 one-year runs were performed to assess the influence of the data
transfer interval (DTI) between the two models and the internal HIRHAM model
variability of 10 variables. DTI frequencies between 12 and 120 min were
assessed, where the computational overhead was found to increase
substantially with increasing exchange frequency. In terms of hourly and
daily performance statistics the coupled model simulations performed less
accurately than the uncoupled simulations, whereas for longer-term cumulative
precipitation the opposite was found, especially for more frequent DTI rates.
Four of six output variables from HIRHAM, precipitation, relative humidity,
wind speed and air temperature, showed statistically significant
improvements in root-mean-square error (RMSE) by reducing the DTI. For these
four variables, the HIRHAM RMSE variability corresponded to approximately
half of the influence from the DTI frequency and the variability resulted in
a large spread in simulated precipitation. Conversely, DTI was found to have
only a limited impact on the energy fluxes and discharge simulated by MIKE SHE. |
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