Régionalisation des débits moyens mensuels en Algérie du nord

Touazi, M.; Bhiry, Najat; Laborde, Jean-Pierre; Achour, Farid

doi:10.7202/1006110ar

Cited by 5 publications

(3 citation statements)

References 18 publications

(20 reference statements)

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“…Indeed, the stream flow is very irregular and low flow is insignificant in the dry period, as it is discussed in different previous papers (e.g. Bouanani, 2004; ABH‐OCC, 2006; Touazi, Bhiry, Laborde, & Achour, 2011; Hallouz, Meddi, & Mahe, 2013; Meddi et al, 2017).…”

Section: Area and Datamentioning

confidence: 63%

Complete multivariate flood frequency analysis, applied to northern Algeria

Karahaçane

Meddi²,

Chebana³

et al. 2020

J Flood Risk Management

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Extreme hydrologic events are commonly described by several dependent characteristics, such as duration, volume and peak flow for floods. Traditionally in Algeria and North Africa, flood frequency analysis (FFA) is conducted as a univariate approach focusing separately on each single of flood characteristics. On the other hand, elsewhere, multivariate FFA studies have been conducted focusing on some FFA steps (especially modelling). The current study aims to consider complete multivariate FFA at-site case studies in northern Algeria using 11 hydrometric stations. It is also among the first studies dealing with multivariate FFA in a complete way by considering all the required steps of the analysis (multivariate outliers detection, multivariate assumptions testing and copula fitting) and on datasets from Algeria. Multivariate stationarity, homogeneity and independence assumptions have been well verified before modelling. The Weibull distribution is mostly selected as margin distribution for the duration, volume and peak flow series. Frank, Clayton and Gumbel copulas are commonly selected to describe the dependence structure on the three flood pairs of variables. These findings should be interesting in water management and flood risk assessment in these regions. Combining these flood characteristics enables the design of more efficient hydraulic structures.

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Section: Area and Datamentioning

confidence: 63%

Complete multivariate flood frequency analysis, applied to northern Algeria

Karahaçane

Meddi²,

Chebana³

et al. 2020

J Flood Risk Management

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show abstract

“…La particularité de cette étude réside dans son approche méthodologique qui consiste à définir les indices et à les analyser. Il faut aussi ajouter que contrairement aux travaux antérieurs (DECHEMI et al, 2003;TOUAZI et al, 2011;HALLOUZ et al, 2013) qui fondent leurs analyses sur des valeurs mensuelles et interannuelles, cette étude s'intéresse aux données journalières. En effet, les phénomènes d'inondation peuvent bien être journaliers; c'est-à-dire qu'un cours d'eau n'entre en crue qu'à la suite d'un ou plusieurs jours consécutifs pluvieux.…”

Section: Définition Des Indices Hydrologiquesunclassified

Tendance des précipitations et évolution des écoulements dans un cadre de changement climatique : bassin versant de l’oued Mina en Algérie

Hallouz

Meddi

Mahé

et al. 2019

rseau

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Cette étude porte sur l'analyse de la variabilité spatiale et temporelle des indices de précipitation, température et débit dans le bassin versant de l'oued Mina (6 048 km 2) dans le Nord-Ouest algérien pendant la période de 1979 à 2013. L'application du test non paramétrique de Kruskal-Wallis sur les indices de pluies a révélé que le total annuel des pluies et le nombre maximal de jours consécutifs pluvieux présentent une grande variabilité spatiale. Le nombre de jours de forts débits diminue du nord vers le sud du bassin. Quant au test de Mann-Kendall, il a révélé une tendance décroissante du total annuel des pluies. En revanche, les températures maximales et minimales ont significativement augmenté dans le temps. Il en est de même des séquences des jours secs consécutifs, des intensités des pluies et des jours extrêmement pluvieux. Aussi, la fréquence des jours avec des forts débits a diminué alors que celle avec des faibles débits a augmenté dans les trois oueds de Mina, Haddad et El Abd. Enfin, la baisse de pluies et l'augmentation de la température ont généré une diminution des ressources en eau.

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“…The same was observed when the region was divided into two areas (west-central and east-central). The third approach was to work on the three regions obtained by Touazi et al (2011), when studying the monthly mean flows in Northern Algeria, to serve as the basis for checking the homogeneity of maximum flows in these regions using the L-moments method (Figure 1). This regionalisation was done using dynamic components analysis and led to the delineation of three hydrologically homogeneous regions.…”

Section: Delineation Of Homogeneous Regionsmentioning

confidence: 99%

Application of the L-moments approach to the analysis of regional flood frequency in Northern Algeria

Assani

Toumi

Meddi

2017

IJHST

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Algeria is periodically affected by severe and repeated flooding. Flood hazard studies require the estimation of extreme flood flows. To predict and estimate the characteristics of maximum flows, knowledge of their distribution law is essential. The L-moments method was used to determine homogeneous regions and the appropriate distribution for these regions. Three homogeneous regions were delineated. This technique produced a Pearson type III distribution for the coastal region and the Tell Atlas and a Pareto distribution for the steppe regions and high plateaus of Eastern and Western Algeria. To estimate maximum flow at ungauged sites for different return periods, the 'index-flood' method was used. An empirical formula was developed that uses the average annual maximum flow as a function of catchment area and the average slope of the main channel to estimate maximum flow at any point on the Oued. The coefficient of determination and the Nash criterion, for the three regions, are superiors to 88% and 83% respectively. The root mean squared error, for the three regions, is less than 12%. These values show the robustness of the developed models.

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Régionalisation des débits moyens mensuels en Algérie du nord

Cited by 5 publications

References 18 publications

Complete multivariate flood frequency analysis, applied to northern Algeria

Complete multivariate flood frequency analysis, applied to northern Algeria

Tendance des précipitations et évolution des écoulements dans un cadre de changement climatique : bassin versant de l’oued Mina en Algérie

Application of the L-moments approach to the analysis of regional flood frequency in Northern Algeria

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