 |
| Titel |
Is the groundwater reservoir linear? Learning from data in hydrological modelling |
| VerfasserIn |
F. Fenicia, H. H. G. Savenije, P. Matgen, L. Pfister |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 10, no. 1 ; Nr. 10, no. 1 (2006-02-22), S.139-150 |
| Datensatznummer |
250007921
|
| Publikation (Nr.) |
 copernicus.org/hess-10-139-2006.pdf |
|
|
|
|
|
| Zusammenfassung |
| Although catchment behaviour during recession periods is better identifiable
than in other periods, the representation of hydrograph recession is often
weak in hydrological simulations. Among the various aspects that influence
model performance during low flows, in this paper we concentrate on those
more inherently related to the modelling, such as the development of a
suitable model conceptualization, and the choice of an appropriate
calibration strategy. In this context we develop a methodology where the
calibration procedure is combined with an iterative process of model
improvement, to obtain an optimal model configuration that performs well
both during low flows and high flows. The methodology starts by calculating
a synthetic master recession curve that represents the long-term recession
of a given catchment. Subsequently, using a simple reservoir model, we
determine the storage-discharge relation that simulates the slow hydrograph
component. This relation is determined without making any a-priori
assumption on its form and is inferred from discharge data available through
an iterative process. Next, high flow related parameters are recalibrated
separately, to avoid that the simulation of low discharges is neglected in
favour of a higher performance in simulating peak discharges. This
methodology is applied on several catchments in Luxembourg, and as a result
we determined that in all catchments except one (where human interference is
high) within the chosen model structure a linear reservoir describes best
the observed groundwater behaviour. This result is used to trigger a
discussion as to the general suitability of the use of a linear groundwater
reservoir in hydrological modelling. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|