Sécheresse et modification de la relation pluie–débit: cas du bassin versant de l’Oued Sebdou (Algérie Occidentale)

Belarbi, Halima; Touaibïa, Bénina; Boumechra, Nadir; Amiar, Sakina; Baghli, N

doi:10.1080/02626667.2015.1112394

Cited by 18 publications

(14 citation statements)

References 24 publications

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“…Topographic features consisting in steeply slopes and a discontinuous vegetal cover create an environment conducive to high floods by intense rain in the autumn for flushing the sediment accumulated on the exposed soils after a dry summer season [77]. The previous studies on rainfall variability in Northwestern Algeria reported the drought in the forties of the last century and revealed a decrease in spring rain as a potential reason [7,78]. 1944 is characterized as a wet year and the two wettest decades follow in the 1950s and 1960s [11].…”

Section: Trend Analysismentioning

confidence: 99%

“…1944 is characterized as a wet year and the two wettest decades follow in the 1950s and 1960s [11]. The drought decade in the 1970s was detected by References [7,11,47] in the Tafna basin. This decreasing trend is also evident in the Mediterranean region of Northern Morocco [11,13] and can be explained by a change in atmospheric circulation [11,79].…”

Section: Trend Analysismentioning

confidence: 99%

“…The situation is changing with having a wet year in 1975. This is followed by a dry year in1976 [47], and, then, the occurrence of the two driest decades in the 1980s and 1990s [7,11,80]. Especially in the 1980s, a dry level is due to a decrease in the winter rainfall [7,78] and the fluctuation to the wet years after the break date in 2007, which is driven by an increase of a rainfall trend in the autumn.…”

Section: Trend Analysismentioning

confidence: 99%

“…The variability in rainfall has an important impact on the hydrological cycle and availability of water resources [6]. Around 13% of Algeria has a Mediterranean climate, and the watersheds of this region contribute to approximately 75% of the annual surface water flow [7] with a situation of water scarcity in dry periods [8]. A reducing trend of rainfall with an order of 20% in the northern center of Algeria was observed in the late 1970s [9], which led to a drastic decrease of stream flow by almost 55% in this region, and fluctuations from 61% to 71% brought a decline in stream flow in the extreme northwest [10] due to a reduction of more than 36% of rainfall [9].…”

Section: Introductionmentioning

confidence: 99%

“…The results show a decreasing trend in annual rainfall. However, Belarbi et al and Bakreti et al [7,50] applied the Mann-Kendall test on rainfall and stream flow time series in Tafna basin. The majority of the results showed a decreasing trend.…”

Section: Introductionmentioning

confidence: 99%

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Analyzing Trend and Variability of Rainfall in The Tafna Basin (Northwestern Algeria)

et al. 2020

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Northwest Algeria has experienced fluctuations in rainfall between the two decades 1940s and 1990s from positive to negative anomalies, which reflected a significant decline in rainfall during the mid-1970s. Therefore, further analyzing rainfall in this region is required for improving the strategies on water resource management. In this study, we complement previous studies by dealing with sub basins that were not previously addressed in Tafna basin (our study area located in Northwest Algeria), and by including additional statistical methods (Kruskal–Wallis test, Jonckheere-Terpstra test, and the Friedman test) that were not earlier reported on the large scale (Northwest Algeria). In order to analyse the homogeneity, trends, and stationarity in rainfall time series for nine rainfall stations over the period 1979–2011, we have used several statistical tests. The results showed an increasing trend for annual rainfall after the break detected in 2007 for Djbel Chouachi, Ouled Mimoun, Sidi Benkhala stations using Hubert, Pettitt, and Buishand tests. The Lee and Heghinian test has detected a break at the same year in 2007 for all stations except Sebdou, Beni Bahdel, and Hennaya stations, which have a break date in 1980. We have confirmed this increasing trend for rainfall with other trend detection methods such as Mann Kendall and Sen’s method that highlighted an upward trend for all the stations in the autumn season, which is mainly due to an increase in rainfall in September and October. On a monthly scale, the date of rupture is different from one station to another because the time series are not homogeneous. In addition, we have applied three tests enabling further results: (i) the Jonckheere-Terpstra test has detected an upward trend for two stations (Khemis and Hennaya), (ii) Friedman test has indicated the difference between the mean rank again with Khemis and Hennaya stations and the Merbeh station, (iii) according to the Kruskal-Wallis test, there have been no variance detected between all the rainfall stations. The increasing trend in rainfall may lead to a rise in stream flow and enhance potential floods risks in low-lying regions of the study area.

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Section: Trend Analysismentioning

confidence: 99%

Section: Trend Analysismentioning

confidence: 99%

Section: Trend Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analyzing Trend and Variability of Rainfall in The Tafna Basin (Northwestern Algeria)

et al. 2020

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Adaptation and Resilience Measures in the Face of Extreme Events in Algeria

Hallouz,

Meddi

2023

Disaster Risk Reduction for Resilience

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Analysis of the Hydrological Behavior of Watersheds in the Context of Climate Change (Northwestern Algeria)

Belarbi

Touaibïa²,

Boumechra

et al. 2021

Natural Disaster Science and Mitigation Engineering: DPRI Reports

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The aim of this work is to study the temporal evolution of the rainfall-runoff relations of four basins in northwestern Algeria: the Tafna Maritime, Isser Sikkak, downstream Mouilah and Upper Tafna basins. The adopted approach consists of analyzing hydroclimatic variables using statistical methods and testing the nonstationarity of the rainfall-runoff relation by the cross-simulation method using the GR2M model. The results of the different statistical methods applied to the series of rainfall and hydrometric variables show a decrease due to a break in stationarity detected since the mid-1970s and the beginning of the 1980s. The annual rainfall deficits reached average values of 34.6% during the period of 1941–2006 and 29.1% during the period of 1970–2010. The average annual wadi flows showed average deficits of 61.1% between 1912 and 2000 and 53.1% between 1973 and 2009. The GR2M conceptual model simulated the observed hydrographs in an acceptable manner by providing calculated runoff values in the calibration and validation periods greater or less than the observed runoff values. The application of the cross-simulation method highlighted the nonstationarity of the rainfall-runoff relations in three of the four studied basins, indicating downward trends of monthly runoff.

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Sécheresse et modification de la relation pluie–débit: cas du bassin versant de l’Oued Sebdou (Algérie Occidentale)

Cited by 18 publications

References 24 publications

Analyzing Trend and Variability of Rainfall in The Tafna Basin (Northwestern Algeria)

Analyzing Trend and Variability of Rainfall in The Tafna Basin (Northwestern Algeria)

Adaptation and Resilience Measures in the Face of Extreme Events in Algeria

Analysis of the Hydrological Behavior of Watersheds in the Context of Climate Change (Northwestern Algeria)

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