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Regionalization of precipitation and air temperature over high-altitude catchments - learning from outliers.
- Source :
-
Hydrological Sciences Journal/Journal des Sciences Hydrologiques . 2010, Vol. 55 Issue 6, p928-940. 13p. 1 Chart, 6 Graphs, 2 Maps. - Publication Year :
- 2010
-
Abstract
- Closing the water balance of mountainous catchments may sometimes become tricky, even before applying a hydrological model. In this paper, we focus on mountainous, snow-affected catchments and try to understand the reasons for the “unrealistic” hydrological behaviours that they sometimes show: when annual runoff is greater than the annual areal precipitation estimate, something is obviously wrong, but finding the appropriate means to adjust the water balance is far from a trivial matter. This paper aims to improve our knowledge of the water balance of mountainous and snow-affected catchments in two different countries: Sweden and France. We use a simple non-dimensional framework to detect outliers and then propose an regionalization of precipitation and air temperature in order to better estimate inputs over high-altitude catchments. Since we are interested in catchment water balance, we evaluate our regionalized input estimates by comparing them to streamflow measurements. The results are mixed: in Sweden, our approach is successful because it can make most outlier catchments become regular ones; but in France it is disappointing because it does not solve most of the water balance problems identified. However, for both countries, the regionalization approach significantly improves the performance of a rainfall-runoff model at a daily time step. Citation Valery, A., Andreassian, V. & Perrin, C. (2010) Regionalization of precipitation and air temperature over high-altitude catchments - learning from outliers. Hydrol. Sci. J. 55(6), 928-940. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02626667
- Volume :
- 55
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Hydrological Sciences Journal/Journal des Sciences Hydrologiques
- Publication Type :
- Academic Journal
- Accession number :
- 52998529
- Full Text :
- https://doi.org/10.1080/02626667.2010.504676