 |
| Titel |
The effect of watershed scale on HEC-HMS calibrated parameters: a case study in the Clear Creek watershed in Iowa, US |
| VerfasserIn |
H. L. Zhang, Y. J. Wang, Y. Q. Wang, D. X. Li, X. K. Wang |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 7 ; Nr. 17, no. 7 (2013-07-15), S.2735-2745 |
| Datensatznummer |
250018934
|
| Publikation (Nr.) |
 copernicus.org/hess-17-2735-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| In this paper, we use the Hydrologic Modeling System (HEC-HMS) to simulate
two flood events to investigate the effect of watershed subdivision in terms
of performance, the calibrated parameter values, the description of
hydrologic processes, and the subsequent interpretation of water balance
components. We use Stage IV hourly NEXRAD precipitation as the
meteorological input for ten model configurations with variable sub-basin
sizes. Model parameters are automatically optimized to fit the observed
data. The strategy is implemented in Clear Creek Watershed (CCW), which is
located in the upper Mississippi River basin. Results show that most of the
calibrated parameter values are sensitive to the basin partition scheme and
that the relative relevance of physical processes, described by the model,
change depending on watershed subdivision. In particular, our results show
that parameters derived from different model implementations attribute
losses in the system to completely different physical phenomena without a
notable effect on the model's performance. Our work adds to the body of
evidence demonstrating that automatically calibrated parameters in
hydrological models can lead to an incorrect prescription of the internal
dynamics of runoff production and transport. Furthermore, it demonstrates
that model implementation adds a new dimension to the problem of
non-uniqueness in hydrological models. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|