Impacts des barrages sur les caractéristiques des débits moyens annuels en fonction du mode de gestion et de la taille des bassins versants au Québec

Assani, Ali A.; Lajoie, Francis; Laliberté, Charles B.

doi:10.7202/015741ar

Cited by 17 publications

(18 citation statements)

References 29 publications

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“…The duration of the flow records for each station flows is at least ten years. We should specify that the flow measurement duration has no impact on the relationship between watershed size and flow characteristics, as we have already shown for annual and daily flows (Assani et al, 2005(Assani et al, , 2006a. The watersheds analyzed range in size between 100 and 30,000 km 2 ( Table 2).…”

Section: Methodology Stations and Data Analysis Methodsmentioning

confidence: 98%

“…This approach is justified by the fact that in natural rivers, there is high proportionality between discharges and watershed areas in Québec at annual, monthly and daily scales (Assani et al, 2005(Assani et al, , 2006aBelzile et al, 1997). The proportionality method has two stages.…”

Section: Methodology Stations and Data Analysis Methodsmentioning

confidence: 98%

“…Indeed, many studies devoted to the hydrological impacts downstream from reservoir dams in the temperate regions of the Northern Hemisphere are particularly interested in quantification of the flow changes induced by these structures, without seeking to analyze the influence of watershed size, particularly on the extent of these changes (Andrews and Pizzi, 2000;Assani, 2004;Assani et al, 2002;Batalla et al, 2004;Dynesius and Nilsson, 1994;Gailiusis et al, 2003;Graf, 1999;Harman and Stewardson, 2005;Higgs and Petts, 1988;Huszar et al, 1999;Leconte et al, 2001;Loizeau and Dominik, 2000;Nislow, 2001, 2005;Montaldo et al, 2004;Peggs et al, 2003;Peters and Prowse, 2001;Petts, 1984;Ritcher et al, 1998;Saad and Turgeon, 1988;Turgeon and Charbonneau, 1998;Vuglinsky, 1997;Yang et al, 2004;Ye et al, 2003). To date in Québec, the influence of watershed size has been analyzed on an annual scale (Assani et al, 2006a) and a daily scale (Assani et al, 2005(Assani et al, , 2006b), but has only been shown on a daily scale. Therefore, it was interesting to verify whether watershed size could influence monthly flow characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, they cannot determine the influence of watershed size, particularly on the hydrological changes induced by the dams. To overcome this difficulty, we will use the proportionality method, which allows simultaneous comparison of watersheds of different sizes in each month so as to determine the influence of these two variables on hydrological changes by comparing the flow characteristics of natural rivers and regulated rivers (Assani et al, 2005(Assani et al, , 2006a. The purpose of our study is to answer the following question: can the ecohydrological method proposed by Belzile et al (1997), and then recommended by FAPAQ (1999), be applied downstream from reservoir dams to estimate the instream flow requirements from the monthly flows without risk of overestimating or underestimating the instream flow requirements, for certain watersheds and for certain months?…”

Section: Introductionmentioning

confidence: 99%

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Impacts of dams on monthly flow characteristics. The influence of watershed size and seasons

Lajoie¹,

Assani²,

Roy³

et al. 2007

Journal of Hydrology

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Section: Methodology Stations and Data Analysis Methodsmentioning

confidence: 98%

Section: Methodology Stations and Data Analysis Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Impacts of dams on monthly flow characteristics. The influence of watershed size and seasons

Lajoie¹,

Assani²,

Roy³

et al. 2007

Journal of Hydrology

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“…Selon ASSANI et al (2007), trois méthodes sont couramment utilisées pour analyser l'effet des barrages :…”

Section: Méthodes D'analyseunclassified

Analyse des écoulements dans le bassin du fleuve Sénégal de 1960 à 2008

Cissé

Sambou

Diémé

et al. 2014

rseau

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L’hydrologie du fleuve Sénégal est tributaire de l’influence cumulée de la variabilité climatique et des barrages de Diama et de Manantali depuis la mise en service de ces derniers. Aujourd’hui, dans la vallée du fleuve, on assiste à une recrudescence des inondations. C’est dans ce contexte que nous nous proposons d’étudier l’évolution du régime hydrologique du fleuve Sénégal afin d’appréhender, à la fois, l’effet de la variabilité climatique et des barrages sur les écoulements. Une approche statistique associant plusieurs méthodes complémentaires (indices centrés et réduits, tests de détection de ruptures des moyennes et procédure de segmentation des séries) a été utilisée. Nos analyses nous ont permis de constater, sur le bassin du fleuve Sénégal, la rupture climatique des années 1970 qui s’est traduite par une diminution de l’écoulement moyen annuel mais aussi des cotes maximales annuelles et minimales annuelles. Cependant, une reprise significative des écoulements moyens annuels est observée à partir des environs de l’année 1994, ce qui atteste l’entrée dans une nouvelle période climatique plus humide que celle des décennies 1970 et 1980 à l’échelle du bassin du fleuve Sénégal. En outre, dans la vallée du fleuve, l’écoulement moyen annuel est renforcé, depuis la fin des années 1980 et le début des années 1990, par l’effet cumulé des barrages (par leurs impacts sur l’occupation du sol) et de la variabilité climatique. En effet, les barrages ont entraîné une hausse des crues maximales annuelles à la station de Bakel depuis 1994 et un soutien considérable des étiages dans toute la vallée du fleuve Sénégal.Since the commissioning of Diama and Manantali dams, the hydrological regime of the Senegal river depends on the cumulative impact of climate variability and dams. Nowadays, in the valley of the river there is an increase in flooding. The aim of this research was to analyze the evolution of the hydrological regime of the Senegal River in order to determine the effect of both climate variability and the dams on stream flows. A statistical approach combining several complementary methods (standard scores indices, tests for statistical ruptures and a segmentation series procedure) was used. Our analysis revealed that in the Senegal River Basin, a climatic break in the 1970s resulted in a decrease in the mean annual discharge and also in the annual maximum and minimum water levels. However, a significant recovery of the average annual flow is observed from around 1994, demonstrating the occurrence of a new climatic period, wetter than the 1970s and 1980s, across the Senegal River basin. In addition, in the river valley, the yearly mean of the flow is supported, since the late 1980s and early 1990s, by the cumulative effect of the dams (by their impact on land use) and climate variability. Furthermore, dams have led to an increase of the maximum annual flood levels at the Bakel station since 1994, and to a considerable support of low flows across the entire Senegal River Valley

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