Fluctuations hydropluviométriques du bassin-versant de l'oued Tafna à Béni Bahdel (Nord-Ouest algérien)

Ghenim, Abderrahmane Nekkache; Megnounif, Abdesselam; Seddini, Abdelali; Terfous, Abdelali

doi:10.1684/sec.2010.0240

Cited by 21 publications

(8 citation statements)

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“…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%

“…This variability revealed two synchronous periods from positive to negative anomalies, which explains the decrease in rainfall [11]. The decline in rainfall resulted in a significant drop of surface water resources by more than 69% and further led to a decline in the storage level of Meffrouche dam [47,48]. Hamlaoui-Moulai et al and Ghenim and Megnounif [45,49] have carried out trend analysis of rainfall on a large scale (Northwest Algeria) and included a number of basins.…”

Section: Introductionmentioning

confidence: 99%

“…The majority of the results showed a decreasing trend. Ghenim et al [47] also performed trend analysis of rainfall in the Tafna basin. However, they did not apply the Mann-Kendall test in their study.…”

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: 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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“…In the Algerian Northwest, the rainfall deficit reached 36%, (Ghenim and Megnounif, 2013) leading to a severe decrease in surface runoff. In the Upper Tafna, runoff has decreased by 69% (Ghenim et al, 2010). Knowing that the recharge of water tables is provided mainly by precipitation (Yles, 2022).…”

Section: Introductionmentioning

confidence: 99%

Impact of Climatic Factors on the Mekerra watershed (North-West Algeria) via Hydrometeorological Series Provided By The Google Earth Engine Platform

Amel

Chafik

Reda

et al. 2023

Egyptian Academic Journal of Biological Sciences. C, Physiology

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Algeria is facing an endemic drought spread over 40 years and the lack of rainfall makes us fear the worst for the country's water security. The variability in the amount of rainfall and its irregularities in time and space are the main causes of the behavior of a climatic regime.This work focuses on the analysis of climatic data provided by the google earth engine platform in order to detect temporal changes in the hydrometeorological series.The climatic results of our Mekerra watershed show a very irregular hydrometeorological system, a long dry season, an LST that reaches 54 C°, an average annual rainfall amount is 390.41 mm and a rainfall deficit estimated at 30%, a very low rainfall deficit of a maximum value of 0.42 and an NDWI globally negative.

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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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Fluctuations hydropluviométriques du bassin-versant de l'oued Tafna à Béni Bahdel (Nord-Ouest algérien)

Cited by 21 publications

References 1 publication

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

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

Impact of Climatic Factors on the Mekerra watershed (North-West Algeria) via Hydrometeorological Series Provided By The Google Earth Engine Platform

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

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