Article (Scientific journals)
A method for low-flow estimation at ungauged sites: a case study in Wallonia (Belgium)
Grandry, Maud; Gailliez, Sébastien; Sohier, Catherine et al.
2013In Hydrology and Earth System Sciences, 2013 (17), p. 1319-1330
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Abstract :
[en] 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.
Research center :
Curagx
Disciplines :
Environmental sciences & ecology
Author, co-author :
Grandry, Maud ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Systèmes Sol-Eau
Gailliez, Sébastien ;  Université de Liège - ULiège > Doct. sc. agro. & ingé. biol.
Sohier, Catherine ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Systèmes Sol-Eau
Verstraete, Arnaud;  Université de Liège - ULiège > Sciences et technologies de l'environnement > Systèmes Sol - Eau
Degré, Aurore  ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Systèmes Sol-Eau
Language :
English
Title :
A method for low-flow estimation at ungauged sites: a case study in Wallonia (Belgium)
Publication date :
2013
Journal title :
Hydrology and Earth System Sciences
ISSN :
1027-5606
eISSN :
1607-7938
Publisher :
European Geosciences Union, Katlenburg-Lindau, Germany
Volume :
2013
Issue :
17
Pages :
1319-1330
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
AMICE Adaptation of the Meuse to the Impacts of Climate Evolution
Funders :
Interreg IVB NWE
Available on ORBi :
since 23 May 2013

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