Mise en évidence de la sécheresse par l’étude de la variabilité climatique dans le bassin versant de l’oued Mekerra (Nord-Ouest algérien)

Otmane, Abdelkader; Baba-Hamed, Kamila; Bouanani, Abderrazak; Kebir, L.W.

doi:10.1051/tsm/201809023

Cited by 12 publications

(10 citation statements)

References 22 publications

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“…Several studies have been given high attention in detecting the trend in climate variables (mainly rainfall and temperature) world-wide [16,[28][29][30][31][32][33][34][35][36][37][38]. Some of them in the Mediterranean region include the study in the Campania region located in Southern Italy.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…In the region of Sidi Ali Benyoub, the Alfa gives way to cereals, vines, and citrus fruits. About 20% of the basin area is forest-covered (Otmane et al 2018).…”

Section: Study Areamentioning

confidence: 99%

“…The oued Mekerra catchment is under the influence of a semi-arid Mediterranean climate characterized by a hot and dry summer and a relatively mild and humid winter. The prevailing winds are from the north-west and west; the average maximum inter-annual velocity is about 20 m s −1 (Otmane et al 2018). The temperature values vary between a minimum value of 10 °C and a maximum of 24 °C, with an annual average of 17 °C.…”

Section: Data Acquisitionmentioning

confidence: 99%

Characterization and frequency analysis of flooding solid flow in semi-arid zone: case of Mekerra catchment in the north-west of Algeria

et al. 2020

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In this study, we evaluate the soil erosion and solid transport in the oued Mekerra watershed in north-west Algeria. The study area is subject to a semi-arid climate characterized by irregular rainfall and showers, which are often accompanied by significant floods. These floods of large volumes transport large amounts of solid input to the Sarno dam, which is in the outlet of oued Mekerra. Therefore, the water storage capacity of this dam is gradually decreasing, and it might reach the volume of dead water. For this study, we utilized the hydrometric database provided by the National Agency of Water Resources (ANRH). The operating period was 24 years, from 1988 to 2012. This period was extended by classic regression to 65 years, which allowed extracting a series of annual maximum instantaneous flow rates (Q IXA ) and subsequently quantified the sediment yield during floods. The specific degradation mean created by the 11 floods was quite high, in the order of 20 t km 2 year −1 . The highest value of solid contribution was observed during the floods of October 2000 (250,000 t), and the value of liquid contribution was 7,151,608 m 3 . The extracted results from the analysis of the graphs of concentration as a function of the liquid flow (C = f′(Q l )) showed four types of hysteresis curves: clockwise loop, counterclockwise loop, shape of eight, and straight line curve. Class II (clockwise loop) was the dominant class in the four events, namely the floods that occurred on 09/22/1992, 09/21/1998, 09/27/1999, and the 08/24/2002. From these results, the water resource sector managers could formulate various methods for protection from floods and against the risk of sedimentation in storage structures.

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“…Du point de vue climatique, l'Algérie a un climat méditerranéen, caractérisé par une saison sèche et chaude coïncidant avec la saison estivale et une saison froide, pluvieuse correspondant à la saison hivernale (OTMANE et al, 2018). Par ailleurs, dans notre région d'étude on peut distinguer un climat de montagne pluvieux, froid à amplitude thermique relativement faible et un climat de plaines plus sec relativement chaud et à forts écarts thermiques (KHALDI, 2005).…”

Section: Présentation De La Zone D'étudeunclassified

Apport de la variabilité spatiale des caractéristiques physiques du bassin versant dans la modélisation hydrologique et les sous-produits du bilan hydrologique : cas du bassin versant de l’aval Mekerra, Algérie

Otmane

Hamed

Bouanani

2019

rseau

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Mise en évidence de la sécheresse par l’étude de la variabilité climatique dans le bassin versant de l’oued Mekerra (Nord-Ouest algérien)

Cited by 12 publications

References 22 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)

Characterization and frequency analysis of flooding solid flow in semi-arid zone: case of Mekerra catchment in the north-west of Algeria

Apport de la variabilité spatiale des caractéristiques physiques du bassin versant dans la modélisation hydrologique et les sous-produits du bilan hydrologique : cas du bassin versant de l’aval Mekerra, Algérie

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