Evolution des pluies extrêmes dans le bassin du Chéliff (Algérie) au cours des 40 dernières années 1971–2010

Taïbi, Sabrina; Meddi, Mohamed; Mahé, Gil

doi:10.5194/piahs-369-175-2015

Cited by 12 publications

(5 citation statements)

References 29 publications

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“…The decrease in the number of rainy days recorded in this study is also observed in [41] in Saudi Arabia with 0.22 d/decade for the period from 1979 to 2008 and in the Beijing-Tianjin region in China with 0.57 d/decade for the period from 1960 to 2014 [42]. [43] confirm the decrease in the PRCPTOT index of 28 mm/decade in Ain El Haddid and 125 mm/decade in Sidi Medjahed in their work on the evolution of extreme rainfall in the Chéliff basin (Algeria) over the last 40 years 1971-2010. [44] also showed a decrease in annual rainfall in this region from the mid-1970s.…”

Section: ) Annual Total Wet-day Rainfall (Prcptot)supporting

confidence: 74%

Trend of Extreme Precipitations Indices in West-central Côte d’Ivoire: Case of the Lobo Watershed

Allechy¹,

Ta²,

Bi³

et al. 2020

EJERS

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The Lobo watershed located in the west-central part of Côte d'Ivoire is an area with high agricultural potential, influenced by climate variations and changes that reduce crop yields. The objective of this study is to analyse trends in ETCCDI extreme rainfall indices from rainfall data from 1984 to 2013 using ClimPACT2 software. This study shows that the trend of the indices: number of consecutive wet days (CWD), number of rainy days (R1mm) and the cumulative annual total rainfall (PRCPTOT) is decreasing. On the other hand, the number of consecutive dry days (CDD) is on the rise. In general, the whole basin has experienced a decrease in rainfall as well as wet sequences and an increase in dry sequences. These different trends observed in this study are more pronounced in the northern half of the watershed.

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Section: ) Annual Total Wet-day Rainfall (Prcptot)supporting

confidence: 74%

Trend of Extreme Precipitations Indices in West-central Côte d’Ivoire: Case of the Lobo Watershed

Allechy¹,

Ta²,

Bi³

et al. 2020

EJERS

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“…The Tafna watershed is thus characterised by a semi-arid climate, limestone dominant lithology, strong erosion due to erratic storm events, and a degraded vegetation cover, in addition to the presence of dams. These characteristics are similar to those of large river basins in the Maghreb region and consequently, the Tafna can be considered a representative of other basins in Morocco (Moulouya Basin, Tekken and Kropp, 2012;Tovar-Sanchez et al, 2016); Algeria (Chelif Riber Basin, Saint-Martin et al, 1992;Taibi et al, 2015;Wadi Rhumel-Boumerzoug, Bentellis-Mosbah et al, 2003); and Tunisia (Medjerda Basin, Bouraoui et al, 2005).…”

Section: Description Of the Study Areamentioning

confidence: 64%

Origin, distribution, and behaviour of rare earth elements in river bed sediments from a carbonate semi-arid basin (Tafna River, Algeria)

Benabdelkader

Taleb

Probst

et al. 2019

Applied Geochemistry

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A B S T R A C TThe behaviour and sources of rare earth elements (REE) in river sediments were investigated at ten stations and two dams of the Tafna basin (Northern Algeria) during contrasting hydrological conditions and using a combination of normalisation procedures, REE anomalies, various REE ratios, and multivariate statistical analysis. The ranking and REE concentrations were in the range of other carbonated areas. The classical fractionation of the heavy REE(HREE) erosion pattern, evidenced from upstream to downstream by the La/Yb or Sm/Yb ratios, was disturbed by the presence of dams, which retained the light REE (LREE) in particular. The hydrological conditions, particle size, and geochemical characteristics controlled the REE patterns. The LREE were associated with clay minerals and HREE with coarse silts, whereas carbonate and particulate organic carbon (POC) did not influence the transport downstream. The total concentration of REE in sediments was not strongly affected by anthropogenic inputs from various sources (industrial activities, and domestic or medical wastes). Indeed, some LREE enrichment and anomalies were detected at a few stations and locally for Gd, Tb, and Yb. However, the anthropogenic contribution can partially be hidden by dilution due to particle erosion. High flow increased the LREE and MREE enrichment and LREE/HREE fractionation in some places due to erosion processes and anthropic influences (dam releases and local wastes inputs). Middle REE (MREE) and HREE were the most extractable elements unlike LREE (which are the most concentrated), particularly during high water conditions. Finally, the REE demonstrated the impact of natural processes (hydrological, geochemical, and physical) and some anthropogenic disturbances (waste inputs, fertilisers, and dams). This might inspire to develop such investigations in other similar semi-arid basins undergoing various pressures. The use of local bedrock as a reference and a set of geochemical and statistical tools, is recommended.

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“…(2013) did not show any decrease in the rainfall regime in the eastern part of the study area. On the other hand, the analysis of daily extreme precipitation in the northwest of Algeria (Cheliff Basin), for the same study period (1971–2010), showed a significant general downward trend in total precipitation and its intensity at certain stations (Taibi et al ., 2015). As for Meddi and Toumi (2015) suggested that the maximum frequency of daily precipitation can exceed 170 mm for a return period of 100 years in the coastal areas of eastern Algeria.…”

Section: Discussionmentioning

confidence: 99%

Extreme precipitation trends in northeast Algeria using a high‐resolution gridded daily dataset

Bessaklia

Serrano‐Notivoli

Ghenim

et al. 2021

Intl Journal of Climatology

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This work presents a study of variability and trends of extreme precipitation events in northeast Algeria using a high-resolution gridded dataset. To this end, 10 extreme precipitation indices were computed over a daily gridded precipitation dataset with a spatial resolution of 1x1 km from 33 series of weather observatories, covering the period from 1970 to 2010. The processes involving the reconstruction of the missing data and gridding were applied based on the approach of creating reference values (RV), allowing for a comprehensive quality control of the original data while reporting and deleting suspicious values that do not correspond to the natural spatial and temporal distribution of daily precipitation. These RV were used to complete a reconstructed dataset without missing values, based on the cleaned data series. Then, it was used to create the high-resolution gridded dataset over northeast Algeria. In view of the obtained results, a general increasing gradient of the extreme precipitation indices from south to north was noted, particularly at the coast and at highaltitude regions. Furthermore, upward trends in extreme intensity and frequency precipitation indices, such as PRCPTOT, SDII, RX1day, RX5day, R10mm, R20mm, CWD, R95p, and R99p were observed, except for the consecutive dry days (CDD) index, which showed a remarkable decrease. However, most of the estimated trends were not statistically significant at .05 levels.

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Evolution des pluies extrêmes dans le bassin du Chéliff (Algérie) au cours des 40 dernières années 1971–2010

Cited by 12 publications

References 29 publications

Trend of Extreme Precipitations Indices in West-central Côte d’Ivoire: Case of the Lobo Watershed

Trend of Extreme Precipitations Indices in West-central Côte d’Ivoire: Case of the Lobo Watershed

Origin, distribution, and behaviour of rare earth elements in river bed sediments from a carbonate semi-arid basin (Tafna River, Algeria)

Extreme precipitation trends in northeast Algeria using a high‐resolution gridded daily dataset

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