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| Titel |
A method for low-flow estimation at ungauged sites: a case study in Wallonia (Belgium) |
| VerfasserIn |
M. Grandry, S. Gailliez, C. Sohier, A. Verstraete, A. Degré |
| 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 ; 17, no. 4 ; Nr. 17, no. 4 (2013-04-08), S.1319-1330 |
| Datensatznummer |
250018842
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| Publikation (Nr.) |
 copernicus.org/hess-17-1319-2013.pdf |
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| Zusammenfassung |
Well-integrated water management can notably require estimating low flows
at any point of a river. Depending on the management practice, it can be
needed for various return periods. This is seldom addressed in the
literature. This paper shows the development of a full analysis chain
including quality analysis of gauging stations, low-flow frequency analysis,
and building of a global model to assess low-flow indices on the basis of
catchment physical parameters.
The most common distributions that fit low-flow data in Wallonia were
two-parameter lognormal and gamma. The recession coefficient and percolation
were the most explanatory variables, regardless of the return period. The
determination coefficients of the models ranged from 0.51 to 0.67 for
calibration and from 0.61 to 0.80 for validation. The regression
coefficients were found to be linked to the return period. This was used to
design a complete equation that gives the low-flow index based on physical
parameters and the desired return period (in a 5 to 50 yr range).
The interest of regionalisation and the development of regional models are
also discussed. Four homogeneous regions are identified, but to date the
global model remains more robust due to the limited number of 20-yr-long
gauging stations. This should be reconsidered in the future when enough data
will be available. |
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