Prédétermination des valeurs de crues extrêmes et contribution de la plaine de Sidi Bel-Abbès dans le bilan hydrologique du bassin versant de l’oued Mekerra

Otmane, Abdelkader; Baba-Hamed, Kamila; Bouanani, Abderrazak; Aissa, Safa

doi:10.1051/tsm/201778027

Cited by 7 publications

(3 citation statements)

References 12 publications

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“…8d and 11d) is due to exceptional precipitation recorded during the last 2 years of the observation period. According to Otmane et al (2017) and Otmane et al (2019), rainfall recorded in 2008-2009 concurs in recurrences of more than a century at all stations included in this study.…”

Section: Fig 9 Spatiotemporal Distribution Of Humidity Values For Eamentioning

confidence: 72%

Impacts of groundwater over exploitation on the renewal and hydrodynamic behavior of the alluvial aquifer of Sidi Bel Abbes (Algerian NW)

et al. 2021

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Sidi Bel Abbes plain, in Western Algeria, covers an area of 813 km2 and holds an important groundwater reservoir, providing the region with a large water potential. It displays characteristics of a peri-urban aquifer, with a large agricultural sector. The climatic variations that affected this region, the development of industrial and agricultural activities along with the over-exploitation of the groundwater resource negatively impact the aquifer's hydrodynamic balance. This work is structured around a multiapproach process based mainly on geophysical data to determine the reservoir bathymetry, rainfall data, humidity data using the standardized precipitation index (SPI), piezometric maps, hydrodynamic data, and groundwater extraction rate. Results revealed a significant decrease in humidity values over time. This negatively influences the water potential of the alluvial aquifer and induces a lateral recharge from adjacent aquifers (overfilling). Indeed, the rainfall contribution to the recharge appears low compared to that of the surrounding aquifers. However, total annual rainfall above 500 mm/year may reduce the input of the adjacent aquifers. Besides, our study indicates a well-defined hydrodynamic pattern in the alluvial aquifer, due to the bowl-shaped bedrock of the aquifer and the excessive overexploitation, especially downstream (the region of Sidi Bel Abbes). Thus, this aquifer adapted to such exploitation, through continuous and systematic recharge of drainage flows by the upstream groundwater (regions characterized by a wall uplift). The aquifer’s pluviometric dependence occurs clearly in its south-western part. A 50% humidity value implies a 0–10 m increase in the water table.

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Section: Fig 9 Spatiotemporal Distribution Of Humidity Values For Eamentioning

confidence: 72%

Impacts of groundwater over exploitation on the renewal and hydrodynamic behavior of the alluvial aquifer of Sidi Bel Abbes (Algerian NW)

et al. 2021

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“…Aussi, il a été déjà utilisé dans le contexte algérien dans plusieurs études qui ont démontré son adaptabilité au contexte climatique semi-aride (BOUANANI et al, 2010;MEDANE, 2012;OTMANE et al, 2016;GHERISSI et al, 2017;OTMANE et al, 2017).…”

Section: Modèle Gr4junclassified

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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“…This is the reason to be interested in rainfall-runoff models that helps reconstitute or complete the flow series of a watercourse from the existing rainfall series using the GR (Rural Engineering) model from Cemagref (GR1A for an annual timestep, GR2M for a monthly timestep, and GR4J for a daily timestep) (Nash and Sutcliffe 1970) which is characterized by simplicity of use, adaptability, and robustness (Bouanani et al 2015). The GR models have been tested on a wide variety of basins and climatic contexts (Mouelhi et al 2013;Rwasoka et al 2013;Traore et al 2014;Bouanani et al 2015;Kouakou et al 2016;Lyon et al 2017;Niemi et al 2017;Otmane et al 2017;Nounangnonhou et al 2018). They have been tested on watersheds ranging from less than 10 km 2 to more than 100,000 km 2 .…”

Section: Introductionmentioning

confidence: 99%

Hydrological modeling of floods in the Wadi Bechar watershed and evaluation of the climate impact in arid zones (southwest of Algeria)

2018

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Precise knowledge regarding the quantities of water available in the Wadi Bechar watershed and better management of this resource is necessary to initiate the transformation of rainfall data into hydrometric data (simulated flow); this is the main objective of the hydrological rainfall-runoff modeling. The primary focus of this paper is the rainfall-runoff modeling on an annual and monthly scale in the Wadi Bechar watershed which covers an area of 6858 km 2. We employ the rural engineering model (GR) for annual timestep GR1A and for the monthly timestep GR2M. The input parameters are precipitation (P) and evapotranspiration (ETP) calculated by the Turc method; the output parameter is elapsed water slide (Q). The results obtained indicate that the model takes into account the different atmospheric and underground exchanges, as well as the capacities of the production tank and routing tank. With this work, the contribution of precipitation to flows downstream of the watershed can be evaluated and quantified. On an annual scale, the potential evapotranspiration modulator coefficient X is equal to 2.20 > 1. This indicates that the water from the Wadi Bechar watershed seeps into the ground or into the adjacent watersheds of Wadi Zousfana and Wadi Guir. On a monthly scale, we calibrate and cross-validate the model with the selected input data, determining the model parameter sets that best reflect the transformation of rainfall into flow. The calibration was done with several passages in computer. The value of the capacity of the estimated production tank X1 is equal to 4.74 mm, which reflects the production function, and subsequently indicates the rainfall capacity transformed into a water flow available for runoff at the Wadi Bechar watershed scale. The value of the estimated underground exchange coefficient parameter X2 is equal to 0.02; it reflects the transfer function, which indicates the movement of this surface flow toward the watershed outlet.

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Prédétermination des valeurs de crues extrêmes et contribution de la plaine de Sidi Bel-Abbès dans le bilan hydrologique du bassin versant de l’oued Mekerra

Cited by 7 publications

References 12 publications

Impacts of groundwater over exploitation on the renewal and hydrodynamic behavior of the alluvial aquifer of Sidi Bel Abbes (Algerian NW)

Impacts of groundwater over exploitation on the renewal and hydrodynamic behavior of the alluvial aquifer of Sidi Bel Abbes (Algerian NW)

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

Hydrological modeling of floods in the Wadi Bechar watershed and evaluation of the climate impact in arid zones (southwest of Algeria)

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